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02 aztek starts up but the temp gauge goes straight to hot and does not move down. Use a heat gun and the block and everything was at normal running temp.

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  • Cars & Trucks Master
  • 2,430 Answers

First remove the cable that goes to the temp sender unit, if the gauge still reads hot there is a short to earth in the cable, if it now reads cool test the sender unit, with a ohms meter and a cool engine take a reading from the unit terminal to earth and record reading, take a reading at running temp and compare , the first reading should be much higher then the hot reading if not replace the unit.

Posted on Apr 26, 2015

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  • Contributor
  • 11 Answers

Prob need to replace the temperature sending unit

Posted on Apr 20, 2013

  • 3 more comments 
  • thomas budzik Apr 20, 2013

    Ok. I have no leaks at all fans turn on when suppose to. Just when I start it the gauge goes straight to hot and won't come down. Used a temp gun and everything looked fine. Were thinking maybe electrical somewhjere

  • william Apr 23, 2013

    either the temperature sensor has come unplugged or needs to be replaced

  • william Apr 23, 2013

    if the temp gauge goes up imediatly as soon as you start it it has to be the temp sender and or the wire to the temp sender

  • thomas budzik Apr 23, 2013

    Wrahlf. what wires are they and where do they go

  • william Apr 23, 2013

    go to your local auto parts dealer and give them the make and model of your car and they should be able to tell you exactly where it is

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 33 Answers

SOURCE: thermostat?

It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.

Posted on Feb 12, 2009

Thunder55
  • 318 Answers

SOURCE: engine overheats when heater pipes connected

I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Posted on Jan 29, 2009

Monster80
  • 460 Answers

SOURCE: temp gauge goes up to hot then back down, up and down...

That is very possible.Your radiator could also be plugged,You water pump could be could be giving out or the head gaskets are bad..Those are all worse case scenario's But yes the thermostat could be the problem..I'd start with that then make sure your clutch is working properly..Hope this helps you and have a great day

Posted on Apr 02, 2009

  • 11 Answers

SOURCE: s40 temp / over heating

hi its rob change the temp switch normly on the cylender head

Posted on Apr 26, 2009

wracefans24
  • 1985 Answers

SOURCE: 1999 Oldsmobile Bravada Heating Problem

when engine is cold remove radiator cap and check coolant level,sounds like it is really low and has an air pocket in it.

Posted on Dec 11, 2009

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I have a 02 Grand caravan that has new radiator, termostat, one new fan. the temp gauge goes up to max hot the drops right back down in seconds. what could be the problem?


it could be you have an air lock in the cooling system
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maybe pull the heat sensor. -replace it OR clean it off, reinstall it.

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Check out related help links with solutions to troubleshoot the problem:---
Click the link below:---
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For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

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Temp gauge goes up to hot then back down only a few times


This is a sign that the thermostat is sticking shut and then opening after the temp gets past a certain point. If the heat gauge goes to high and then drops down suddenly, this is the likely culprit and you need to replace the thermostat - again.

I have had them arrive from the parts store and be defective.

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When the temperature outside is hot and I'm running the air, the temperature gauge starts moving into the hot zone. If I turn off the air, it goes back to normal. I've had it worked on several...


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