Question about 1997 Pontiac Grand Prix

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Over heating the resirvor is full we think its the thermostat but we don't know where it is

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To find out if it your thermostat check the bottom radiator hose and see if is hot if not it is your thermostat and also the water could be the problem locate the water pump on the side of the motor if u see water leaking out of the shaft of the pump it is likely u have a bad water pump also

Posted on Feb 04, 2010

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Posted on Jan 02, 2017

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No heat in Ford Aerostar gage does not move. Heater core was flushed and new thermostat was put in


Just a guess, but I don't think you did this yourself. Take it back to the mechanic and complain.

You didn't say if this was the result of the flush and thermostat change or if you had the problem previously. I tend to think this is a thermostat problem still. It is possible the mechanic simply forgot to install the new thermostat (remote, but possible).

If you have no heat and the temperature guage is pegged cold, the engine is not reaching operating temperature. It is the thermostat's job to regulate this. Does the radiator get warm?

I would take it back to the mechanic if you trust him, or try another if you don't.

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to bleed air out of the system . if no air bleeder as such
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With the car running because it reduces the back pressure have someone that knows how to do it remove the cap from the radiator and see if the radiator is full, not the bottle but the radiator itself. If the antifreeze is not moving from the bottle to the radiator it will overheat. Not having heat unless you rev the engine makes me think the radiator is either not circulating the water or it is low.

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1 Answer

Heater problem


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Change your fuel filter, its probably clogged. I had the same problem. I also changed the thermostat because it was heating up to.

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I don't understand what you mean when you say that you have bypassed the thermostat because it is impossible to do, by what you are saying I think that the thermostat is'nt opening up &needs to be replaced ( are you know what & where the thermostat is)....hope this helps........cheers.

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New thermostat may be faulty. May be stuck open. Remove rad cap and with rad full and eng cold - start vehicle. The coolant should not circulate until eng reaches design temp of thermostat. Let me know if this helps you.

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i would replace thermostat if it don,t cure the problem
your water pump need replacing

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