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Replaced t-stat and water pump and sill no heat at idle ????

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Do you have heat while driving? If you do, it sounds like air is in the system. 1st check the coolant level to make sure it's correct, as low level will cause no heat at idle, and eventually no heat at all along w/ engine overheating.

Posted on Dec 10, 2009


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Sonetimes it gots heat and sometimes dont

Make sure your coolant levels are topped off. Now if you only get heat when the car is moving then you have a bigger problem like your water pump has gone bad. To check this, monitor the coolant level and check periodlically under your car for puddles of coolant when the car is parked for periods of time. If you return and have small puddles under the engine then it is almost 100% that your water pump has gone bad and needs to be replaced. If you dont notice those symptoms then have your t-stat checked out.

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How to diagnose a bad water pump

Not that big a job, to pull the t-stat and test it in hot water in the house.
If you have a candy thermometer and a large pot, suspend the stat in the water via string, heat the water and observe if the stat opens up.
If yes, the at what temp, most are between 170-190 degrees?
If not then you have at least one suspect.
You can also button up the Ford and start it up, does it still over heat without the stat?
Even with the engine cold the pump should still circulate water.
Either way the fastest method is to turn a few wrenches to get a suspect stat out to test.
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May want to by higher rated T stat. Depending on region of the country you can get up to a 210 F t stat.

Did the problem start after a drain of the cooling system? Could be air in the heater core.

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