Question about 2001 Pontiac Grand Prix

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I have replaced the thermostat and the temp. sensor on my 2001 Pontiac Grand prix. I have a 3.8 liter engine. I watch my temp gauge climb rapidly to the red line then drop down to a lower temp. If

I just dont know what else to ask... I have also replaced the radiator that had cracks in it. Can you tell me what the normal operating temp is for my car?

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  • Master
  • 2,101 Answers

That is not normal. sounds like you have the start of a bad intake manifold gaskt leak coming . GM 3.8 have bad intake gaskets. there something I want you to check please. I see a lot of these in my shop. it is a small hard plastic hose. send a picture of it and where it is. and the link to shop on facebookhttps://www.facebook.com/TedsRepairsI have replaced the thermostat and the temp. senso - 11_9_2012_12_39_26_pm.gif

Posted on Nov 09, 2012

  • Kathryn Snyder-Gibson Nov 10, 2012

    I have a question.... My coolant was tinged orange and there was an oily goo stuck to the radiator cap and in the neck of the radiator where you put coolant in. Does this possibly indicate that the intake manifold gaskets are blown?

  • spadewiz88
    spadewiz88 Jan 19, 2013

    Not all the time sometimes just means your dex cool is no longer good and need to flush your radiator and add new coolent. If your intake manifold was going bad you will notice your oil looking like a milkshake. I put aluminum gaskets in my grand prix and now there are aluminum elbows because the plastic parts all fail fast.

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SOURCE: antifreeze ts boiling back into reservoir.

it sounds like a possible head gasket problem,you can get the fluctuation from combustion gases getting pumped into your cooling system and creating gas pockets,i would suggest taking it to a shop and have them do a block test to look for combustion in the cooling system to confirm the problem,that way you will know for sure,if it comes up negative they can also perform a flow test to make sure there is no restriction in the cooling system such as a plugged radiator or a bad thermostat,hope this sheds a little light on it

Posted on Sep 12, 2009

Testimonial: "I bet you've hit on the problem ! Car has been "using " antifreeze for a couple years now, with no leaking anywhere. Lost through the head gasket ?"

morse008
  • 1111 Answers

SOURCE: temperature gauge red lined then dropped back down

yes sounds like a stuck thermostat or the temperature plug if faulty could also you need the radiator fluid tested fro proper mixture

but sounds like thermostat stuck and most likely going bad

Posted on Jan 06, 2010

  • 205 Answers

SOURCE: 2001 Pontiac Grand Prix...overheating. Changed

Did you bleed the radiator after refilling because it sure sounds like you have an air lock in there.

Posted on Jan 06, 2010

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1 Answer

Will the temperature sending unit make my 2000 pontiac grand prix shut off


Don't think so... I had one 2004 prix that lost it's coolant and it ran until it destroyed itself... Had another that would hit red on temp during the summer in the desert mountains. Never shut down on me though.... replaced the radiator, water pump and thermostat. My fans kick on about 3/4 of the temp gauge. Normal temp is between 1/2 & 3/4.

Jun 24, 2014 | 2004 Pontiac Grand Prix

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What could cause my problem.


have u checked the waterpump it might be bad

Jun 26, 2012 | Pontiac Cars & Trucks

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Where is the engine coolant temp sensor located on a 2004 grand prix gt


On the 3.8 liter the coolant temp sensor is right below the the thermostat in the intake manifold on the drivers side of the engine.

The thermostat is under the housing that is bolted to the intake plenum that the upper hose is attached to.

Jan 18, 2012 | 2004 Pontiac Grand Prix

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I noticed my engine light on the dash of my 2004 Grand Prix was on so checked code with tester. Said coolant temp below thermostat temp. Replaced thermostat drove car for 30 minutes. Popped hood fixed top...


Yes that is what the code means. GM usually uses two, one that makes the gauge work and one that tells the ECM what the engine temp. is. You need the one for the computer.

Jan 20, 2011 | 2004 Pontiac Grand Prix

1 Answer

Cooling fan kicks on when start of vehicle, the temperature gauge wont read a temp, just stays at "cool". fans shut off when car is turn off.


PCM is probably not getting a signal from the temp sensor, so it's kicking the fans on just in case. Check connector on sensor. If connector is OK, replace sensor. The sensor is mounted on the thermostat housing near the end of the upper radiator hose. See picks of a couple engine examples below. The part is only $11 at autozone.com, and a pic is pasted below. Let me know if you have any questions.


2.4 liter engine:

jturcotte_124.gif


3.4 liter engine:

jturcotte_125.gif

coolant temp sensor:

jturcotte_15.jpg

Nov 08, 2010 | 2001 Pontiac Grand Am SE

1 Answer

My check engine light is on, and today my temperature gauge stopped working and we have replaced the engine coolant sensor and the connector and temperature gauge still not working. PLEASE HELP


Could be the thermostat. I know nothing about cars but I noticed my 2000 Grand Prix temp gauge was not going to the normal level. My wife drives this car so I didn't notice it for a month or so. Eventually the Engine light came on. Took it to Autozone and the code came back as P0180... (1) low coolant (2) bad thermostat (3) enginge fuel temp sensor. They used a code reader that was about the size of an Ipod nano.

Coolant was okay, so took it to my mechanic. His netbook sized computer showed it was the Thermostat. He reset the codes and the temp guage went back to normal. Was short on $40 for the fix at the time, so I parked the car and promised to bring it back in 3 days. Went out and checked the car a day later at 25 degrees outside without starting the car... gauge still sitting at the normal level. No question it's the thermostat. That car will not be driven again until T.stat is fixed in 2 days.

Oct 18, 2010 | 2004 Pontiac Grand Prix

1 Answer

95 Pontiac Grand Prix Temp gauge pegged on hot always


yes. but check every thing else first. coolant level being the most important. then the thermostat.

Aug 04, 2009 | 1995 Pontiac Grand Prix

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