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Temp gauge says hot. anti-freeze is full.no leaking head gasket and motor stays cold after running

2002 pontiac aztek, 3.4

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Check for a wire to the sender unit broken or disconnected and touching the head or ground

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Bad step motor in the instrument cluster that controls the temp gauge . The best way to check it would be with a professional type scan tool that can view sensor data parameters . You first need to know how that gauge gets the info to set the correct temp . There is a coolant temp sensor located in a coolant passage on the engine . This sensor is a input to the PCM - engine computer . The PCM needs this info fuel managment , the PCM also sends this info. to the instrument cluster over the Class 2 data network ! There is a microprocessor inside the I/C that deciphers these message bits an uses the step motor to control the gauge needle ! Aren't computers great ?
How to repair GM Instrument Cluster Speedometer Gauge Stepper
This guy says 03 to 06 , i have seen gauge's on earlier models go out too . You could by a used cluster on eBay or at a automotive salvage yard or junk yard , what ever you know them by . $20 buck's at salvage yard , more on eBay .

Posted on Apr 26, 2017

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1 Answer

My 2004 Pontiac Aztek isn't blowing heat. It blows cold air. I had a coolant flush in december.


You probably have an air bubble and therefore doesn't have enough anti freeze in the system. Carefully remove the radiator cap when the engine is running and verify it and/or notice the hot/cold marking on the overflow tank. The system needs to be full to heat.

Feb 19, 2015 | 2004 Pontiac Aztek

2 Answers

Coolant light says hot and temp gauge goes to hot when stopped with no leaks


dont know what diagnostics they have done but that is certainly a possibility. Car would normally , but not always, not run well/idle rough also before overheating started. If gasket is blown internally your oil will probably look milk coffee coloured instead of dark brown.

Another possibility is a faulty thermostat, but their diagnostics may have ruled that out.

Sep 02, 2014 | 2001 Pontiac Aztek

1 Answer

Heater not getting hot


Could possibly be the thermostat. also could be the heater core. keep track of it though, cause if it is anything like mine, it will start to go down hill fast. Mine started that way, and then started using anti-freeze without it leaking. Makes for a fast blown head gasket and or blown motor

Mar 02, 2014 | 2001 Pontiac Aztek

1 Answer

I have a 2003 kia sorento, I had an anti and fiannly I added some Barrs leak. It stopped for awhile. Now I have little warmth, but heater gauge goes to 3/4 mark not half way mark. I drove for an hour...


If you keep topping it up it is still leaking and if there is no external leak then you probably have a blown head gasket with water leaking into the cylinders. You need pressure checks on the radiator and engine to find out where it is bad.
Check your oil level and see if the oil on the dip stick is white and foamy or clean and just dirty oily. If it is white and foamy it has water mixed with it (emulsified) and you have a leak between the water and oil galleries. (Normally a head gasket)
If the car will let you see the coolant, top the radiator up with the engine cold and leave the cap off so you can see the water flowing round. Run the engine until you see the water flowing round when the engine thermostat opens. If you get air bubbles in the radiator coolant your head gasket has gone. If you get a sudden burst of air through the coolant, again, the head gasket has gone.

It will NOT get better by itself and could be an expensive repair - new car time? Sorry.

Dec 12, 2013 | 2003 Kia Sorento

1 Answer

Oil in anti-freeze


That is not a good sign. These are a few ways this can happen. Bad head gasket, bad intake manifold gasket, cracked or warped head, or a cracked engine block. If the intake manifold gasket hasn't been replaced yet, have it checked for leaks. The 3100 and 3400 V6 engines are prone for intake gasket failure.

Jun 06, 2010 | 2002 Pontiac Aztek

1 Answer

Leaking coolant bottom left side of motor


It could be a leaking freeze plug, cracked block/head, bad head gasket, or warped head (from overheating usually). Use rags or paper towels to wipe away any oil or dirt to pinpoint the leak source. This requires patience and determination to find sometimes. Does the engine need to be hot before it leaks, or does it drip all the time? Good luck!

May 21, 2010 | 2001 Pontiac Aztek

1 Answer

My pontiac g6 just start leaking coolant and running hot what is the problem and is it expensive to fix


check where it is leaking from.if from rad overflow it could be you thermostat and inexpensive to replace or possibly rad cap.You can sometimes check if stat is working by getting motor to running temp and check if rad pipe to motor is getting hot if this is the case it is probably working.You might also have to check if you open rad cap(when COLD)run motor and see if there are any bubbles in this case worstsenario is head gasket ,pump or even worse cracked head(very expensive)

hope this helps but you may need specialist equipment for a full diagnosis if the simple solutions have not solved your problem

Aug 02, 2009 | 2006 Pontiac G6

1 Answer

I have similar problem and i was told


check for fans coming on,,fan relay,fan fuse,,coolant sensor,,,bleed coolant system

Jul 05, 2009 | 2002 Pontiac Aztek

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