Question about 2002 Mercury Cougar

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My 2002 cougar gets heat when it is not at idle but no heat at idle. it does not overheat at all. i have plenty of antifreeze. what causes this? water pump?

When I open my fill tank the antifreeze does not look like it is circulating.

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Is the engine temperature getting warm, maybe you need a thermostat? If you are looking in the overflow tank you will not see circulation. Maybe your heater core is becoming plugged. When you run down the road is it hot or just sort of warm?

Posted on Feb 08, 2012

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2002 mercury cougar overheats at idle and when drove faster ik head gasket isnt blown, thermostat , water pump, relay, its been flushed out till clean idk whats wrong at all.


I suspect that if you do not have electric fan/s then the fan clutch or viscous fan hub has failed
indications are over heating at idle , stop lights , slow traffic, high rpms at slow speed but cools down as soon as there is enough road speed to put air through the radiator.

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Can my 1999 Cadillac Seville concourse overheat by mixing too much water with antifreeze??


Theoretically yes. Antifreeze has a higher heat capacity than water. Basically, a liter of antifreeze can hold more heat than a liter of water. I dont think it would be enough to cause an overheat though

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Bad news.Most likely cause is internal leak though head gasket. Check for water in oil. Dipstick oil might be grey and emulsified. Or if leak is in into cylinder coolant may just be going out exhaust. Sorry

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Engine temperature increases more than normal when car is at idle


i would say u may need to wash the radiator out. dont use a power washer. u can bend the fins. also check to make sure u radiator if full, a air in the system can cause it to not circulate right at low rpms make sure you fan isnt damaged. i think u have a mechanical fan on that so check to make sure it isnt loose in the hub. make sure it moves plenty of air at idle. also if u are using antifreeze it could be a head gasket causeing combustion gas to go into the cooling system. it will cause it to overheat only at low idle untill it gets real bad. make sure ur heater core is blowing out plenty of heat if not u have a circulation problem. not likely the water pump but may be a sticky thermostat. also one imortant think. look at the radiator cap u have a small piece of metal on the bottom in the middle of the rubber. its got a spring. u should be able to pull it down a little bit and it should go back up. if the spring is broken the cap needs replaced. hope this helps.

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My temp goes up when my car is idle and the ac on


If the temperature goes up when the ac is on, then there may be a problem with the circulation of coolant throughout the system. You said you changed the thermostat which is good. But, did you backflush the engine's cooling system so that maximum flow can be achieved?

On the other hand, the heat that comes off of the condenser can cause the radiator to cool less efficiently on hot days.

Does the fan immediately go on when the a/c is turned on? or is it the older style fan belt driven fan? Even, so, if it's an older style fan, the clutch sometimes go bad in them so that the fan doesn't spin as efficiently as it should.

Also, did you use 50/50 Antifreeze to water ratio coolant mixture?
If you use pure Antifreeze 100% concentration, then it can cause an overheat condition, because the fluid at this concentration doesn't transfer heat as well as a 50/50 solution of antifreeze to water.

Good luck fixing this problem.

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Yes That is exaxtly what will happen, If the water pump is not pumping the antifreeze throught the system then not enough hot water will get to the heater core to give you heat inside the cabin and also not enough hot water will get to the radiator to get cooled off thus the overheating. Hope this helps.

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That is common since the a/c condenser is in front of the radiator. It may just be time for you to service the cooling system. If you have the orange antifreeze in your system, there only good for 5 years or 150,000 miles and then it needs to be flushed out and replaced with new antifreeze. Make sure the new antifreeze has a 50/50 mix (antifreeze/water) to much antifreeze will gel up when heated causing poor heat transfer and to much water will boil over. Water has great heat transfer but boils at 100C' so antifreeze is added. Service the cooling system for now, don't worry about the thermostat till you change the antifreeze unless you want to replace it too.  Good luck and keep me posted.

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