1996 Pontiac Grand Prix overheating

Automotive questions for anything about engines.
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karen
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Joined: Tue Oct 21, 2014 7:52 am

1996 Pontiac Grand Prix overheating

Post by karen » Tue Oct 21, 2014 7:55 am

We just bought our 18 year old daughter a 1996 pontiac Grand Prix 3.1L v6. It ran fine with no overheating problems at all. The check engine light came on and the reading was the thermostat. We changed the thermostat and the temperature valve, started it up and it started over heating. It would reach a temperature reading of 260 and neithe of the fans would run. We checked to see if the fans were good and they are. We put in a new water pump also. What could cause this problem to accure? We are stumped

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karlk
Posts: 87
Joined: Fri Dec 27, 2013 7:39 pm

Re: 1996 Pontiac Grand Prix overheating

Post by karlk » Sun Nov 02, 2014 11:42 pm

Your car has two coolant temperature sensors. One is for the gauge, the other is for the computer to turn on the radiator fans. That one might be bad so the computer does turn on the fans.

Another possibility is a bad fan relay or even just a fuse. First check all the fuses. Next swap out the coolant fan relays with know good relays. There can 2 or even 3 that control the radiator fans in your Pontiac. They work together and one can cause the whole circuit to fail.

Also, you would need to test for power and ground for the fans to see if that is good. If not, then back to what i said about the relays. If there is power and ground, then the fan motor(s) is bad.

Leonidas
Posts: 1
Joined: Mon Sep 28, 2015 5:53 pm

2002 Pontiac Sunfire stopped running

Post by Leonidas » Mon Sep 28, 2015 6:14 pm

i was driving down the road and it just stoped running.... now im a pritty good mechanic and so i checked all the usual reasons for this to happen... so i am down to my last idea and started to remove everything so i could take off the timing cover and see what was going on there so i was in the middle of this and i decided to check the throttle body.... I open the throttle and look inside and there was a puddle of oil.. now i have been a Mechanic for a long time and i have never heard of this or seen this EVER!!!!! maybe i have been lucky but i have no idea what caused this or what to do about it except tear the whole motor apart... can someone help me and maybe save me alot of time and money????? what do i do?????

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karlk
Posts: 87
Joined: Fri Dec 27, 2013 7:39 pm

Re: 2002 Pontiac Sunfire stopped running

Post by karlk » Tue Oct 27, 2015 8:52 pm

The oil in the intake is probably not the cause of the no start condition. You may have a faulty PCV system- which is not really a PCV valve, but just a port in the intake manifold.
I would continue with the diagnosis of the no start-
do you have spark
do you have fuel pressure
do you have fuel injector pulse
is the engine in time

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