Question about 1995 Mercury Cougar

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Cooling system my fan relay went out and i fixed it, but it still is overheating. I dont have any idea how to check the thermostat or water pump. where do i start?

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Dose your fan work at all.if the fan works ok then go with this idea, if you know where the thermastat is pull it out , and the run it a day or two to see if it overheats then. if it stills over heats then, then your water pump is'nt turning. another way to test to see if your thermastat is working check the bottom of it to see what the temprature rating is , then put it in some water on stove and heat it to the temp. the thermastat shold open at that temp you saw on the bottom.

good luck

Posted on Dec 09, 2009

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These are somethings that maybe causing it to over heat (1) not enough cooling in it.(2) water pump drivebelt (3) Radiator core blocked (4) Bad thermostat (5) fan blades broken or cracked (6)Radiator cap need to be replace (7) Ignition timing incorrect if all fails stop by your local library and get your hands on a Haynes auto repair Manual for your car wish you the best of luck Michigan Man

Posted on Dec 09, 2009

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Thank you for using FIxya and good luck

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Removal of the thermostat from the cooling system is not a good idea. This upsets the coolant flow rate in the system, and that can cause the engine to overheat, even when no other problem with the cooling system exists.

Try to identify the cause of the overheating.

Ensure that engine tune, or other engine mechanical fault condition is not the cause of the overheating, then go through the checklist following:-

1) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok,
2) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle.
3) Check coolant reservoir pressure cap is serviceable,
4) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on).
5) Check for combustion gas bubbles in the coolant reservoir while the motor is running - this indicates a blown head gasket. If in doubt, take it to a radiator shop and ask for a combustion gas check on your radiator.
6) Check condition of radiator core:-
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Dont know where thermostat goes. engine overheating, coolsnt not cycling.


The thermostat is bolted into the bottom of the water pump, the lower radiator hose connects to a cover that holds the thermostat to the water pump.

the thermostat can be difficult to get at because the AC and power steering pump are all bolted on top of the water pump,

Your problem may not be a bad thermostat.
I would also check:

1) water pump, some of the vw pumps are poorly made & tend to go bad.

2) fans belts, it can be tricky to get the right tension on these belts due to a badly designed tensioner system on the power steering & water pump belt.

3) hoses, radiator, coolant tank,. the radiators and coolant tank tend to leak when they get old, the plastic cracks or the rubber seals go bad.
Also check the electrical system controlling the engine cooling fans. there are sensors and relays that can go bad.
I have owned 8 vw's most of the major problems with these cars was due to electical problems.

4) Engine problems such as a blown head gaskets, or ignition timing problems can cause overheating. luckily VW engines usually don't have these problems, unlike other companies 4 cylinder engines (the Dodge Neons for example)



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2 Answers

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