Question about 2004 Pontiac Grand Prix

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Engine light on, scan code said thermostat

How do I change the thermostat in 2004 Grand Prix?

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  • Anonymous Feb 26, 2009

    engine light came on has code checked said some thing about coolent temp low, possible thermostat malfunction, coolant tepm sensor defect, or low coolant level. had radiator fushed and filled thermostat chand six months ago.

  • cuddieb Mar 03, 2009

    was told had a bad sensor for low coolant temp.



    temperature gauge doesnt go very high probably only to the first line above the zero line. still seems to have heat

  • Anonymous Mar 16, 2014

    2004 grand prix code p0036 what is the problem

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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

1 Answer

On my 2004 Grand Prix, my car has to be running for at least 45 minutes for some heat to work.The yellow light by the heater blinks while the blower comes on and goes off repeatedly until the light is...


It is possible that your thermostat is stuck open. Normally, the thermostat remains closed when starting cold, confining coolant to the engine block and cylinder head until it heats up. Once the coolant in the block is warm (usually within 10 minutes), the thermostat begins to open and let coolant flow into the radiator to cool it down some. A properly operating thermostat will continue to cycle until the coolant reaches the operating temperature of the thermostat--usually around 180 deg F. Then the thermostat will continue to adjust its opening to maintain that temp.

Thermostats can get stuck in both closed and open positions. When stuck closed, the engine will quickly overheat. When stuck open, the engine will take forever to warm up--especially in cold weather because the coolant is continually pushed into the radiator and cooled off before it ever has a chance to get warm. Changing the inexpensive thermostat may help correct your condition.

Jan 25, 2011 | 2004 Pontiac Grand Prix

1 Answer

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

Engine light came...code says thermastat...engine runs cooler then normal...just change out thermastat??? Cap for last several months has been really hard to get off...I live in phx and its been really...


Yes, change out the thermostat. It's probably stuck all the way open because in Arizona it rarely gets cold enough for it to need to close down allowing the engine to warm up. It's easy to do. Try this link for instructions.

Dec 29, 2010 | 2004 Pontiac Grand Prix

1 Answer

Check engine light, and engine temp gauge drops. Otherwise car is running well.


If the thermostat is stuck open, the engine temperature will drop and set a fault code indicating that the engine is not reaching operating temperature. This will cause your check engine light to come on. Have someone scan your engine computer. Most large parts chains will scan for codes at no cost to you. If there is a "Thermostat" or "Engine temp low in closed loop" or a similar code indicating low engine temperature, replace the thermostat.

Dec 04, 2010 | 2004 Mercury Grand Marquis

2 Answers

2004 grand prix no go with traction control light on.


I had the same problem with my car. I cleaned the throttle body and when i installed everything back, the car would throw 2 OBD codes: P0120 at start up and P0507 when it stalled at a red light. Took it to the dealership and they had to install a new throttle body because the throttle position sensor is internal. Cost = $718.00 out the door. Part is about $480 and labor is 1.8 hours at $99.00/hr (bunch of ****). There is only a 12 month/12,000 mile warranty for work from the dealer so I would recommend doing the work yourself if possible. There is only 2 bolts on top, 2 nuts on bottom, 1 electrical connection, and 1 hose clamp.

Feb 12, 2010 | 2004 Pontiac Grand Prix

2 Answers

Engine light came on 2004 grand prix


if you live near an AUTOZONE parts store or PEP BOYS they will scan for free

Dec 30, 2009 | 2004 Pontiac Grand Prix

1 Answer

Check engine light came on along with check gas cap


Did u have engine codes scanned? If not, have it done, as it may indicate the problem. Let me know. (most parts stores will scan for codes free) .

Mar 21, 2009 | 2004 Pontiac Grand Prix

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