Question about 1988 Pontiac Firebird

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Temp needle does not move but car runs very hot,replaced thermostat,any suggestions?

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Replace the temperture sending unit ( usually in the radiator).

Posted on Aug 22, 2010

  • Ralph Cronenberg Aug 22, 2010

    and check your water pump

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Posted on Jan 02, 2017

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SOURCE: 2.0D X-type engine is running cold , thermostat

Sounds like you have an air pocket in the cooling system. Take the radiator cap off the radiator(not when engine is hot) and then start the car. As air moves through the lines you will see the antifreeze level go down. Let it run and pour coolant into the radiator until it stays full. then put on the radiator cap and fill the overflow tank to the right level and I hope that fixes your problem.

Good Luck

Posted on Feb 03, 2010

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1 Answer

Temperature needle stays on the hot , have changed temperature sensor but it still stays on the hot and the engine is not overheating or leaking anything..what is making it stay on the hot


replace the thermostat,, and make sure that the fan engages , just because the fluids don't boil over doesn't mean the temp isn't to high, if your saying that the temp gauge is stuck on the hot setting, and doesn't move even when the car is cold,, thats a different problem,, if thats the case whats the make , model , and year

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2.0D X-type engine is running cold , thermostat changed twice so far , but needle barely moves off cold. Not using water , sometimes get hot air in car but engine temp only 51 degrees , oil temp is fine....


Sounds like you have an air pocket in the cooling system. Take the radiator cap off the radiator(not when engine is hot) and then start the car. As air moves through the lines you will see the antifreeze level go down. Let it run and pour coolant into the radiator until it stays full. then put on the radiator cap and fill the overflow tank to the right level and I hope that fixes your problem.

Good Luck

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I don't think the 2 have been synchronized, i.e. the thermostat and the temp gauge as if they for different manufacturers products. As a result your fan is always running no matter what the engine temp is, so I guess the thermostat is either faulty or it has not been installed properly.....sodeep

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I had the radiator and thermostat changed


when you had the thermastat replaced the might have put a higher temp one in and that will make it seem like it's running hot you might have to put a lower temp one in

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Warm the engine up to operating temperature. Does the upper radiator hose get warm? If no, then cange the thermostat. If yes, then the thermostat is working fine. On the thermostat housing, there is a sensor. Some engines have 2 sensors. One goes to the computer and the other goes to the temp needle in the dash. Unplug the harness and put a jumper wire in the harness. Turn the key to on, and see if the temp needle goes up. Which ever harness causes the needle to go up, replace that sensor. Hope this helps.

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1986 Ford Econoline 350 Temp Guage Problem


The gauge can very well be "lying" to you.

As a precaution, I would do a routine cooling system service on it. This includes completely flushing the coolant, replacing the thermostat and radiator cap (believe it or not, a bad cap can cause issues too).

On the few Fords I have owned, mine were always in the middle, or to the left of the middle.

Motor homes should run cooler actually, beings as they tend to have heavy duty large capacity cooling systems.

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1 Answer

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hi the temp" sender "in this case is a thermostatic switch normaly with 2 connections put an ohm meter across the connections when engine is cold it will show nill or full scale leave meter connected run motor up untill it is hot meter needle should have moved 1 way or the other if it did not the relay is at fault chris merlinv12

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