What should you check before assuming the thermostat is responsible for a cooling system problem on 2005 Mercedes-Benz C240?

Check the drive-belt tension, temperature gauge and coolant level before attributing the problems in cooling to the thermostat. The thermostat can be stuck open in case the engine warms slowly. Put it into hot water and when it does not open/close correctly, change it, remembering to fill it up and bleed the cooling system again.

Genuine 2005 Mercedes-Benz C240 Thermostat

Engine Coolant Thermostat

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2005 Mercedes-Benz C240 Thermostat Housing
Part Number: 112-203-02-75
$42.60 MSRP: $60.00
You Save: $17.40 (29%)
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Product Specifications
- Other Name: Thermostat Element; Thermostat Housing
- Replaces: 112-200-00-15, 112-200-00-15-28
- Item Weight: 1.10 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 112-203-02-75
- Warranty: This genuine part is guaranteed by Mercedes-Benz's factory warranty.
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Fits the following 2005 Mercedes-Benz C240 Submodels:
- 4Matic, Base | 6 Cyl 2.6 L GAS

2005 Mercedes-Benz C240 Thermostat Parts Q&A

Q: What should you check before assuming the thermostat is responsible for a cooling system problem on 2005 Mercedes-Benz C240?
A: Check the drive-belt tension, temperature gauge and coolant level before attributing the problems in cooling to the thermostat. The thermostat can be stuck open in case the engine warms slowly. Put it into hot water and when it does not open/close correctly, change it, remembering to fill it up and bleed the cooling system again.