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My temp gauge is fluct on my 2005 Grand Prix GXP 5.3L. I'm guessing it may be a thermostat getting stuck? Already replaced the water pump myself. Any advice on this or how to get to the thermostat? Looks like a pain to get to Thanks, -Tony
Re: My temp gauge is fluct on my 2005 Grand Prix GXP...
How long after water pump did this start fluctuating, loosen rad cap and run engine until fan kicks in ( to purge any air in system) would hurt to squeeze upper rad hose will running to assist in this.
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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.
Yes , having the vehicle checked for DTC'S - diagnostic trouble code's should always be the first step in diagnostic process when any warning lamps are lit on the instrument cluster . Would be best to have someone with a professional type scanner , that can view engine sensor data . The engine coolant temp. sensor is a input to the PCM - engine computer . Can see what the actual temp. of the engine is . GM had bad stepper motors inside the instrument cluster's 2003 to 2006 , these stepper motors control the gauge needles . Testing what the real temp is an not going by temp gauge . harbor freight tools sells a tool under $30 bucks that can check engine temp .
Infrared Laser Thermometer .. Point it at the thermostat housing . Can use it to tell what temp. the thermostat open .
But , testing is the key ! Not guessing .
the hose that goes to the water pump is usually the bottom radiator hose, the radiator hose that goes to the thermostat housing is the top radiator hose......cheers.
IF CAR TEMP GAUGE IS GOING ABOVE 200 DEGREES, CHANGE THEMOSTAT IMMEDIATELY BEFORE YOU DO DAMAGE TO THE ENGINE. IF THE TEMP STAYS AT 195 DEGREES, THE THERMOSTAT IS STUCK OPEN AND THE ENGINE WILL TAKE LONGER TO WARM UP. IT IS AN EASY FIX IF YOU ARE MECHANICALLY INCLINED. BUY NEW THEMOSTAT- ABOUT 10 -15 DOLLARS - AND CHANGE. HAD THE SAME PROBLEM WITH MY 04 GRAND PRIX.
You have a plugged up heater core. Try pulling the heater hoses of where they go into the firewall, put a garden hose with a spray nozzle in one hose and gently flush the system out. you will need to pull both heater hoses off to do this.
its either of the 3 ur water pump is weak and couldnt supply the right amount of coolant to ur engine / ur radiator is clogged or your thermostatic valve is stuck up that restrict full flow of fluid to the radiator thats why when u use the heater that uses ur coolant hot water as a heating unit the temp. goes down...
more than likely the thermostat has stuck open. Or opening to soon not allowing the car to reach normal operating temperature. I would start by replacing the thermostat. Clearing the code and running a drive cycle and see if the code comes back. if the code does not return problem solved. if it does return replace the coolant temp sensor.
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