How to remove and refit the water pump on Mercedes-Benz 190E?

On 4-cylinder petrol engine models start by disconnecting the negative cable of the battery, and emptying the cooling system. And take off both the cooling fan and the auxiliary belt pulley on the water pump, then the thermostat and its body in the cylinder head. Take the bypass hose out and disconnect the radiator bottom hose and heater return hose at the water pump and the auxiliary hose. In the early models, disconnect the electromagnetic coupling of the water pump spindle, but in the later models you need to unplug the wiring of the couple. Then disassemble the alternator, its mounting bracket, the various lengths of bolts holding the pump, etc. To refit, clean the engaging surfaces, but do not score them and fit fresh gaskets as all bolts are screwed to the required torque. Install the electromagnetic coupling again, tension auxiliary drivebelt(s) and recharge the cooling system. On 6-cylinder petrol engine models, the start without connecting a battery negative cable and empty the cooling system. De-mount the auxiliary drivebelt and tensioner, remove the power steering pump unscrewed, leaving the hoses connected, remove the air cleaner and the inlet scoop moulding. The water pump can have better access after taking off the distributor and auxiliary belt cover panel. When possible, relocate the air conditioning compressor, the heater return pipe and retrieve the O-ring seal. In automobiles that have an oil cooler, unscrew the cooling pipe assembly and not only retrieve the O-ring, but also put it back in. Detach the thermostat, the top hose to the radiator and the top hose to the cylinder head and manipulate out the retaining bolts, raising the water pump off the engine enough to retrieve the dowel sleeves and sealing ring. Clean up the mating surfaces during refitting and provide access to the rearmost retaining bolts through the use of a rod and a magnet. Install or replace seals, tighten all bolts to appropriate torque, tension the auxiliary drivebelt(s) and refill cooling system. On the diesel type engine models, loosen the negative battery cable and empty the cooling system. Removal of auxiliary drivebelt and tensioner (when fitted with electromagnetically coupled cooling fan), and removal of cooling fan. Unbolt the heater return pipe, clear all the hoses out of the water pump housing and salvage the O-ring seal. Take off the alternator, bracket holding the alternator, unbolt the housing containing the water pump and take that and the pump off and recycle the gasket. Lastly, wash the mating surfaces, reassemble with fresh gaskets, tighten all bolts the correct amount, reconnect the cooling fan and re-tension the auxiliary drivebelt(s) and fill the cooling system with liquid.

How to check and replace a water pump on Mercedes-Benz C230?

When the water pump fails it is possible to cause severe engine damage because the pump overheats and there are two ways to test the water pump outside the engine. In case of fault with the pump then the pump needs to be replaced with new or refurbished pump. The water pumps have weep holes, which leak coolant when the pump seal breaks and there is a howling noisy sound that might be signalling failure of the bearings. Weakness in a shaft, properly check by relieving the tension on the serpentine belt and rocking the water pump pulley, but the drivebelt may slip to produce a squealing, but this is not movement of the bearing. A pump that does not have telltale signs of disfunction such as noise or dripping still may require replacement; corrosion on the impeller fins may interfere with cooling performance. To replace replace the negative battery terminal, air cleaner housing, and, where available, the cooling fan and engine shock absorber. Drain engine coolant, loosen bolts of water pump pulley without removing, and then loosen drivebelt. Just disconnect the pulley and coolant hoses, unbolt the water pump to the engine and inspect it to make sure that there is no corrosion or missing fins of impeller. With the newer V6 engines, coolant must be drained, remove the drivebelt and the trim covers should be peeled off the timing belt idler pulleys before loosening the pulleys. Un-connect the wiring harness and the coolant hose and loosen the pump bolts and remove. Clean the bolt holes and engine pistons, check new pump suits the old, and strip away all old sealant in gaskets. Check the mating surfaces, and, where required, wash the O-ring grooves of the new O-rings. Install the new pump, screw the bolt piece finger tight, use RTV sealant, bolts should be tightened in batches without tightening them too much. Install all components that have been removed, leave the sealant to dry at least an hour, refill and bleed the cooling system, then run the engine to verify that nothing is leaking and it is functioning properly.

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111 Water Pumps found

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Mercedes-Benz Water Pump
Part Number: 000-500-09-00
$94.80 MSRP: $132.00
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Product Specifications
- Other Name: Coolant Pump; Auxiliary Pump, Water Pump
Fits the following Mercedes-Benz Models:
- E53 AMG | 2019 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
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Mercedes-Benz Auxiliary Pump
Part Number: 463-835-19-00
$116.40 MSRP: $162.00
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Product Specifications
- Other Name: Circulation Pump; Auxiliary Pump
Fits the following Mercedes-Benz Models:
- G550 | 2019-2023 | Base | 8 Cyl 4.0 L GAS
- G63 AMG | 2019-2023 | Base | 8 Cyl 4.0 L GAS
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Mercedes-Benz Water Pump
Part Number: 177-200-04-00
$128.40 MSRP: $179.00
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Product Specifications
- Other Name: Coolant Pump
Fits the following Mercedes-Benz Models:
- AMG GT | 2017-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S E Performance | 2023 | Base | 8 Cyl 4.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- AMG GT Black Series | 2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT C | 2018-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT R | 2018-2020 | Base | 8 Cyl 4.0 L GAS
- AMG GT R Pro | 2020 | Base | 8 Cyl 4.0 L GAS
- AMG GT S | 2016-2019 | Base | 8 Cyl 4.0 L GAS
- C63 AMG | 2016-2021 | Base | 8 Cyl 4.0 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 204-835-02-64
$133.20 MSRP: $185.00
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Product Specifications
- Other Name: Recirculating Pump
Fits the following Mercedes-Benz Models:
- C250 | 2012-2015 | Base, Luxury, Sport | 4 Cyl 1.8 L GAS
- C300 | 2012-2014 | 4Matic, 4Matic Luxury, 4Matic Sport | 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- C350 | 2012-2015 | 4Matic, Base, Sport | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- C63 AMG | 2012-2015 | Base, Black Series | 8 Cyl 6.3 L GAS
- E350 | 2010-2014 | 4Matic, Base | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- E550 | 2010-2011 | 4Matic, Base | 8 Cyl 5.5 L GAS
- GLK350 | 2010-2015 | 4Matic, Base | 6 Cyl 3.5 L GAS
- SL400 | 2015-2016 | Base | 6 Cyl 3.0 L GAS
- SL450 | 2017-2020 | Base | 6 Cyl 3.0 L GAS
- SLK350 | 2012-2016 | Base | 6 Cyl 3.5 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 211-506-00-00
$166.80 MSRP: $232.00
You Save: $65.20 (29%)
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Product Specifications
- Other Name: Recirculating Pump; Auxiliary Pump
Fits the following Mercedes-Benz Models:
- CLS500 | 2006 | Base | 8 Cyl 5.0 L GAS
- CLS55 AMG | 2006 | Base | 8 Cyl 5.5 L GAS
- CLS550 | 2007-2011 | Base | 8 Cyl 5.5 L GAS
- CLS63 AMG | 2007-2011 | Base | 8 Cyl 6.3 L GAS
- E320 | 2003-2009 | 4Matic, Base, Bluetec, CDI | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.2 L DIESEL, 6 Cyl 3.2 L GAS
- E350 | 2006-2009 | 4Matic, Base | 6 Cyl 3.5 L GAS
- E500 | 2003-2006 | 4Matic, Base | 8 Cyl 5.0 L GAS
- E55 AMG | 2003-2006 | Base | 8 Cyl 5.5 L GAS
- E550 | 2007-2009 | 4Matic, Base | 8 Cyl 5.5 L GAS
- E63 AMG | 2007-2009 | Base | 8 Cyl 6.3 L GAS
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Mercedes-Benz Water Pump Assembly
Part Number: 111-200-23-01
$253.37 MSRP: $351.00
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Product Specifications
- Other Name: Water Pump; Water Pump Assembly
- Replaces: 111-200-23-01-80
Fits the following Mercedes-Benz Models:
- C230 | 1999-2000 | Kompressor | 4 Cyl 2.3 L GAS
- SLK230 | 1998-2000 | Kompressor | 4 Cyl 2.3 L GAS
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Mercedes-Benz Water Pump
Part Number: 177-200-02-07
$128.40 MSRP: $179.00
You Save: $50.60 (29%)
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Product Specifications
- Other Name: Coolant Pump
- Replaced by: 177-200-04-00
- Replaces: 177-200-00-01
Fits the following Mercedes-Benz Models:
- C63 AMG | 2016 | Base | 8 Cyl 4.0 L GAS
- C63 AMG S | 2015-2016 | Base | 8 Cyl 4.0 L GAS
- G550 | 2016-2017 | Base | 8 Cyl 4.0 L GAS
- S560 | 2020-2021 | 4Matic, Base | 8 Cyl 4.0 L GAS
- S63 AMG | 2020-2021 | 4Matic | 8 Cyl 4.0 L GAS
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Mercedes-Benz Water Pump
Part Number: 651-200-16-02-80
$232.80 MSRP: $324.00
You Save: $91.20 (29%)
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Product Specifications
- Other Name: Reman Coolant Pump; Water Pump
- Replaced by: 651-200-16-02-28
- Replaces: 651-200-16-02
Fits the following Mercedes-Benz Models:
- Sprinter 2500 | 2020-2022, 2014-2017 | Base | 4 Cyl 2.1 L DIESEL
- Sprinter 3500 | 2020-2022, 2014-2017 | Base | 4 Cyl 2.1 L DIESEL
- Sprinter 3500XD | 2020-2022 | Base | 4 Cyl 2.1 L DIESEL
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Mercedes-Benz Auxiliary Pump
Part Number: 000-500-38-00-80
$182.40 MSRP: $254.00
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Product Specifications
- Other Name: Reman Coolant Pump; Auxiliary Pump, Pump, Water Pump
- Replaced by: 000-500-38-00
- Replaces: 000-500-23-00, 000-500-30-00, 000-500-30-00-28, 000-500-38-00, 000-500-17-00
Fits the following Mercedes-Benz Models:
- A35 AMG | 2020-2021 | 4Matic | 4 Cyl 2.0 L GAS
- AMG GT | 2017-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 43 | 2021-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 53 | 2019-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 63 | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S E Performance | 2023 | Base | 8 Cyl 4.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- AMG GT C | 2018-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT R | 2018-2020 | Base | 8 Cyl 4.0 L GAS
- AMG GT R Pro | 2020 | Base | 8 Cyl 4.0 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 171-835-00-64
$156.00 MSRP: $218.00
You Save: $62.00 (29%)
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Product Specifications
- Other Name: Recirculating Pump; Auxiliary Pump
Fits the following Mercedes-Benz Models:
- R350 | 2006-2012 | 4Matic, Base, Bluetec 4Matic | 6 Cyl 3.0 L DIESEL, 6 Cyl 3.5 L GAS
- R500 | 2006-2007 | Base | 8 Cyl 5.0 L GAS
- R63 AMG | 2007 | Base | 8 Cyl 6.3 L GAS
- SLK280 | 2006-2008 | Base | 6 Cyl 3.0 L GAS
- SLK300 | 2009-2011 | Base | 6 Cyl 3.0 L GAS
- SLK350 | 2005-2011 | Base | 6 Cyl 3.5 L GAS
- SLK55 AMG | 2005-2010 | Base | 8 Cyl 5.5 L GAS
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Mercedes-Benz Water Pump Assembly
Part Number: 104-200-49-01
$268.92 MSRP: $371.00
You Save: $102.08 (28%)
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Product Specifications
- Other Name: Water Pump; Water Pump Assembly
- Replaced by: 104-200-33-01-80
Fits the following Mercedes-Benz Models:
- C280 | 1996-1997 | Base | 6 Cyl 2.8 L GAS
- E320 | 1996-1997 | Base | 6 Cyl 3.2 L GAS
- SL320 | 1997 | Base | 6 Cyl 3.2 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 204-835-03-64
$170.40 MSRP: $238.00
You Save: $67.60 (29%)
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Product Specifications
- Other Name: Recirculating Pump; Pump, Water Pump
Fits the following Mercedes-Benz Models:
- AMG GT 43 | 2021-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 53 | 2019-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 63 | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S | 2023, 2019-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT 63 S E Performance | 2023 | Base | 8 Cyl 4.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- C250 | 2012-2015 | Base, Luxury, Sport | 4 Cyl 1.8 L GAS
- C300 | 2012-2021 | 4Matic, 4Matic Luxury, 4Matic Sport, Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- C350 | 2012-2015 | 4Matic, Base, Sport | 6 Cyl 3.5 L FLEX, 6 Cyl 3.5 L GAS
- C350e | 2016-2018 | Base | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- C400 | 2015 | 4Matic | 6 Cyl 3.0 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 221-500-02-86
$177.60 MSRP: $248.00
You Save: $70.40 (29%)
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Product Specifications
- Other Name: Coolant Pump; Pump
Fits the following Mercedes-Benz Models:
- S400 | 2010-2013 | Hybrid | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV)
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Mercedes-Benz Auxiliary Pump
Part Number: 000-500-36-00-80
$157.05 MSRP: $218.00
You Save: $60.95 (28%)
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Product Specifications
- Other Name: Reman Coolant Pump; Auxiliary Pump, Water Pump
- Replaces: 000-500-36-00
Fits the following Mercedes-Benz Models:
- A220 | 2019-2022 | 4Matic, Base | 4 Cyl 2.0 L GAS
- A35 AMG | 2020-2021 | 4Matic | 4 Cyl 2.0 L GAS
- AMG GT 43 | 2021-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- AMG GT 53 | 2019-2023 | Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- CLA250 | 2020-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
- CLA35 AMG | 2020-2023 | 4Matic | 4 Cyl 2.0 L GAS
- CLS450 | 2019-2023 | 4Matic, Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- CLS53 AMG | 2019-2021 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- E450 | 2021-2023 | 4Matic, Base | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- E53 AMG | 2019-2023 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
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Mercedes-Benz Auxiliary Pump
Part Number: 221-500-03-86
$236.40 MSRP: $330.00
You Save: $93.60 (29%)
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Product Specifications
- Other Name: Coolant Pump; Pump
Fits the following Mercedes-Benz Models:
- S400 | 2010-2013 | Hybrid | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV)
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Mercedes-Benz Water Pump
Part Number: 242-500-00-86
$343.20 MSRP: $478.00
You Save: $134.80 (29%)
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Product Specifications
- Other Name: Coolant Pump
Fits the following Mercedes-Benz Models:
- B Electric Drive | 2015 | Base | BATTERY EV (EV/BEV)
- B250e | 2016-2017 | Base | BATTERY EV (EV/BEV)
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Mercedes-Benz Auxiliary Pump
Part Number: 000-500-56-00-80
$174.96 MSRP: $244.00
You Save: $69.04 (29%)
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Product Specifications
- Other Name: Exchange Coolant Pump; Auxiliary Pump
- Replaced by: 000-500-56-00
- Replaces: 000-500-25-00, 000-500-25-00-80, 000-500-56-00
Fits the following Mercedes-Benz Models:
- AMG GT | 2017-2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT Black Series | 2021 | Base | 8 Cyl 4.0 L GAS
- AMG GT S | 2016-2019 | Base | 8 Cyl 4.0 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 000-500-06-86
$195.60 MSRP: $272.00
You Save: $76.40 (29%)
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Product Specifications
- Other Name: Coolant Pump; Auxiliary Pump, Pump
Fits the following Mercedes-Benz Models:
- CLA250 | 2014-2019 | 4Matic, Base | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- E400 | 2013-2015 | Hybrid | 6 Cyl 3.5 L FULL HYBRID EV-GAS (FHEV)
- GLA250 | 2015-2020 | 4Matic, Base | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- GLA45 AMG | 2015-2019 | 4Matic | 4 Cyl 2.0 L GAS
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Mercedes-Benz Auxiliary Pump
Part Number: 000-500-35-00
$206.40 MSRP: $288.00
You Save: $81.60 (29%)
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Product Specifications
- Other Name: Coolant Pump; Auxiliary Pump, Cooler Pump, Pump, Water Pump
- Replaces: 000-500-43-86
Fits the following Mercedes-Benz Models:
- AMG GT Black Series | 2021 | Base | 8 Cyl 4.0 L GAS
- C300 | 2019-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- C43 AMG | 2023 | 4Matic | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- E350 | 2020-2023 | 4Matic, Base | 4 Cyl 2.0 L GAS
- EQE 350 | 2023-2024 | 4Matic | BATTERY EV (EV/BEV)
- EQE 350 SUV | 2023 | 4Matic | BATTERY EV (EV/BEV)
- EQE 350+ | 2023-2024 | Base | BATTERY EV (EV/BEV)
- EQE 350+ SUV | 2023 | Base | BATTERY EV (EV/BEV)
- EQE 500 | 2023-2024 | 4Matic | BATTERY EV (EV/BEV)
- EQE 500 SUV | 2023 | 4Matic | BATTERY EV (EV/BEV)
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Mercedes-Benz Auxiliary Pump
Part Number: 000-500-08-01
$194.40 MSRP: $270.00
You Save: $75.60 (28%)
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Product Specifications
- Other Name: Coolant Pump; Auxiliary Pump
Fits the following Mercedes-Benz Models:
- GLC300 | 2023 | 4Matic, Base | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- GLE450 | 2022 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- GLE53 AMG | 2024 | 4Matic+ | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- GLS450 | 2023-2024 | 4Matic | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
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Mercedes-Benz Water Pump

The heart of a car's cooling system is, indeed, the Mercedes-Benz water pump. It carries away cooled water from the radiator to the motor block, thus having a critical role in it. After that, this cold coolant passes through the engine block and returns to the pump on its way back to the radiator. As a result, there will always be some cool water circulating that cools down the machine, facilitating control over its temperature. The failure or non-functioning of a Mercedes-Benz water pump stops the circulation of coolant altering; therefore, overheating can occur in an engine if one does not take caution as temperatures increase steadily. Major damages should be expected on many other parts of an engine if such a situation happens. Every vehicle owner must regularly examine their water pump and decide whether it requires replacement or repair services.

Why go for OEM Mercedes-Benz Water Pumps? Because they are the optimal solutions, fit your vehicle perfectly, and are easy to install. Therefore, these factors help maintain the dependability and performance of your vehicle. At MBPartsGiant.com, you may find all the required genuine parts for your Mercedes-Benz. They are delivered from authorized Mercedes-Benz dealers directly via an uncomplicated online catalog. We guarantee promptness, reliability, and cheap sales on the Mercedes-Benz Water Pump, and we always provide you with the right part at any time. Depend on our genuine Mercedes-Benz Water Pumps to keep your vehicle running smoothly.

Mercedes-Benz Water Pump Parts and Q&A

Water Pump
103-200-37-01-80
Q: How to remove and refit the water pump on Mercedes-Benz 190E?
A:
On 4-cylinder petrol engine models start by disconnecting the negative cable of the battery, and emptying the cooling system. And take off both the cooling fan and the auxiliary belt pulley on the water pump, then the thermostat and its body in the cylinder head. Take the bypass hose out and disconnect the radiator bottom hose and heater return hose at the water pump and the auxiliary hose. In the early models, disconnect the electromagnetic coupling of the water pump spindle, but in the later models you need to unplug the wiring of the couple. Then disassemble the alternator, its mounting bracket, the various lengths of bolts holding the pump, etc. To refit, clean the engaging surfaces, but do not score them and fit fresh gaskets as all bolts are screwed to the required torque. Install the electromagnetic coupling again, tension auxiliary drivebelt(s) and recharge the cooling system. On 6-cylinder petrol engine models, the start without connecting a battery negative cable and empty the cooling system. De-mount the auxiliary drivebelt and tensioner, remove the power steering pump unscrewed, leaving the hoses connected, remove the air cleaner and the inlet scoop moulding. The water pump can have better access after taking off the distributor and auxiliary belt cover panel. When possible, relocate the air conditioning compressor, the heater return pipe and retrieve the O-ring seal. In automobiles that have an oil cooler, unscrew the cooling pipe assembly and not only retrieve the O-ring, but also put it back in. Detach the thermostat, the top hose to the radiator and the top hose to the cylinder head and manipulate out the retaining bolts, raising the water pump off the engine enough to retrieve the dowel sleeves and sealing ring. Clean up the mating surfaces during refitting and provide access to the rearmost retaining bolts through the use of a rod and a magnet. Install or replace seals, tighten all bolts to appropriate torque, tension the auxiliary drivebelt(s) and refill cooling system. On the diesel type engine models, loosen the negative battery cable and empty the cooling system. Removal of auxiliary drivebelt and tensioner (when fitted with electromagnetically coupled cooling fan), and removal of cooling fan. Unbolt the heater return pipe, clear all the hoses out of the water pump housing and salvage the O-ring seal. Take off the alternator, bracket holding the alternator, unbolt the housing containing the water pump and take that and the pump off and recycle the gasket. Lastly, wash the mating surfaces, reassemble with fresh gaskets, tighten all bolts the correct amount, reconnect the cooling fan and re-tension the auxiliary drivebelt(s) and fill the cooling system with liquid.
Water Pump
271-200-10-01-80
Q: How to check and replace a water pump on Mercedes-Benz C230?
A:
When the water pump fails it is possible to cause severe engine damage because the pump overheats and there are two ways to test the water pump outside the engine. In case of fault with the pump then the pump needs to be replaced with new or refurbished pump. The water pumps have weep holes, which leak coolant when the pump seal breaks and there is a howling noisy sound that might be signalling failure of the bearings. Weakness in a shaft, properly check by relieving the tension on the serpentine belt and rocking the water pump pulley, but the drivebelt may slip to produce a squealing, but this is not movement of the bearing. A pump that does not have telltale signs of disfunction such as noise or dripping still may require replacement; corrosion on the impeller fins may interfere with cooling performance. To replace replace the negative battery terminal, air cleaner housing, and, where available, the cooling fan and engine shock absorber. Drain engine coolant, loosen bolts of water pump pulley without removing, and then loosen drivebelt. Just disconnect the pulley and coolant hoses, unbolt the water pump to the engine and inspect it to make sure that there is no corrosion or missing fins of impeller. With the newer V6 engines, coolant must be drained, remove the drivebelt and the trim covers should be peeled off the timing belt idler pulleys before loosening the pulleys. Un-connect the wiring harness and the coolant hose and loosen the pump bolts and remove. Clean the bolt holes and engine pistons, check new pump suits the old, and strip away all old sealant in gaskets. Check the mating surfaces, and, where required, wash the O-ring grooves of the new O-rings. Install the new pump, screw the bolt piece finger tight, use RTV sealant, bolts should be tightened in batches without tightening them too much. Install all components that have been removed, leave the sealant to dry at least an hour, refill and bleed the cooling system, then run the engine to verify that nothing is leaking and it is functioning properly.