Question about 2000 Pontiac Grand Prix

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Coolent light and check engine light

Went to auto zone said the engine coolent was below regulating temp they said something about the thermastat but my heat in the car works great. also the antifreeze/coolent is full when i baught the car they said that the sencer for the coolent light had a short???

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  • iceman6914 Dec 06, 2008

    where is the fuel tank pressure sensor located?

  • cbjshorty Dec 19, 2008

    my low coolent light is on but there's a full jug . the car temp is wright.

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Your thermostat will not affect the heat in your car. This is controlled by the heater core which is pulled from coolant from the engine where the coolant will be the hottest. Your thermostat opens and allows the coolant from the engine to circulate into the radiator and the coolant from the radiator flow into the engine. A thermostat is cheap and easy to replace. The sensor should be a fairly inexpensive and easy replacement as well. I would change out the sensor first because bad thermostat would create an overheating problem.

Posted on Nov 22, 2008

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I haves 2004 Pontiac grand prix I was told I had a busted head gasket, took it yo the shop they said I have a leak in my elbow and now my service engine light is on.


just check your oil if its milkey looking then coolent is getting in and more than likley its a head gasket, if not then check for water leeks on the engine block and heads not the hoses if none there check hoses if its in the elbo as they said i assume they mean the one where the thermastat is located those are 19.95 at advance auto, maby cheaper elswhere, easy to change and yes a leak can cause a check engine light to come on, easy way to check for a leak is to use a black light and yellow glasses can be bought at parts stores, the engine coolent will appear to glow and finding the leak may be easyer depending on its location

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I have a 2006 ford fusion, yesterday the check engine light came on as I was driving at highway speed...I went to auto zone and the code read as 128 "coolant temp is always low". The coolant...


the part store you went to can clear the code
however, being LOW in coolant will cause over temp
you concern is probably a defective thermostat or defective CHT

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Check engine light comes on when outside temp is


Take it buy Auto Zone when the light is on and get them to check the code for you. I don't know why it would do it while cold and not hot.

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My scerity sys went off and I my car over heats I think it needs a new thermastat


maybe your security system monitors engine temp ... it doesnt have to be the thermastat thats bad .. it could be the radiator fan switch or relay bad .. you can tell which by the following.
1. if it overheats only when idling or in heavy traffic but does not overheat while on the road (moving) then your problem is more likely the radiator fan switch, relay or fan motor ..
2. if your car overheats all the time even while driving then it could be the thermostat ..

check belts, coolent level and radiator clogging ..

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My engine light when on in my car yesterday and my friend has one of those things that can scan and tell you whats wrong it said my coolent temp below thermistat regulating temp and where where you pull...


Hi:
Your coolant temp sensor was not reading right, and is a sensor that adjusts your eng timing. I would keep an eye on your coolant level. That would be a bigger concern, figuring out if you have a leak. If the cold comes back, you need to change out the coolant temp sensor.

Nov 24, 2009 | 2005 Pontiac Grand Prix

1 Answer

Check engine light is on. error reads PO128 and


hi 128 is coolant temp below regulating temp 405 is










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hi 128 is coolant is below regulating temp 405 is<erg/swsr/ckt low> hope this helps please rate this answer












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2 Answers

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the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob

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I have a 1994 bravada that shuts off about 5 minutes after reaching opperating temp. i have replaced fuel pump, thermastat, temp sensor, and the problem remains the same. it runs perfectly until it cuts...


If there is an Auto Zone around your area, have your Ignition control module (ICM) tested. It's common for the ICM to fail when they heat up causing the engine to stop running. The ICM is located under the rotor in the distributor, check the wire's and look for any corrosion or damaged wires to the ICM. The ICM is $40.00 and Auto Zone will have the step by step instruction for you to get the job done with common tools. Good luck and keep me posted, be glad to help. 

Jun 25, 2009 | 1994 Oldsmobile Bravada

1 Answer

Heat gauge on dash always reads cold


either a faulty temp sending unit or a thermastat stuck open assuming all wire connections are good. if heater blows hot id lean towards the temp sending unit. please rate me trying to make a buck

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