Question about 2001 Pontiac Aztek

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Cooling fans not working properly

All 3 relays are good,fan is good,fan switch is,fuses are good, good,thermostat is good. Symtoms: fans run at very low speed and turn of within 60seconds, they will turn on again eventually repeat the same actions.

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How can we bypass a sensor?

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  • Pontiac Master
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And why do you think this is a problem, they do not run anymore than what is required to cool the engine, as it gets hotter the fans will run longer at a higher speed, but you will seldom see that except on very hot days.

Posted on May 15, 2014

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Posted on Jan 02, 2017

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SOURCE: 2004 pontiac aztek cooling fans not working

relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84

Posted on Aug 26, 2008

keemo68
  • 1263 Answers

SOURCE: Cooling fan

there are relays not just fuses for the cooling fan. look under the hood there should be a black junction box open it and you will see several little black cubes those are relays. if you have the owners manual they will show what each one is for. start the vehicle and let it get to operating temp 180-190 degrees your fans normally kick on at this point what i normally do is take the relay for the a/c clutch and swap it for the radiator cooling fan if the fans kick on you know it was the relay. if they don't kick on then you know that the temp sensor on the radiator is bad., but before you go replacing anything make sure that there are no loose or missing wires. that all mplug connections are tight and not coroded and that with the engine off that the fan blades spin freely. once checking everything and you still have an issue then the fans are bad and need to replace it.. please rate this thanks

Posted on Sep 04, 2008

keemo68
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SOURCE: coolig fans dont run

the cooling fans are run by a relay it's located in the junction box. check this. there is also a thermoatic sensor located near the fans next to radiator. the fans should free spin when the engine is off this is a good indiacator that it's not the fan themselves. if the relay checks out(run engine and switch the fan relay with the a/c clutch relay when the engine reaches 180 degrees you will feel the upper radiator hose get hot the fans will turn on a short time later iof they don't it's the temp sensor near the radiator if they do it's a bad relay...please rate this thanks

Posted on Sep 28, 2008

  • 199 Answers

SOURCE: where is the fuse or relay for the cooling fan in

You have to refer to your owners manual or an after market service manual for fuse locations but that is not the issue. There is a sending unit screwed into the block with a temp sensor that closes the circuit on the ground side when the cooling system reaches a specified temperature. There is a fuse between the hot side and the fan for over current protection (see manual). A bad sending unit is most likely the culprit. Measure the resistance or continuity when the engine is hot from the sending unit body which is grounded to the block, and the output terminal or black wire running to the fan motor. It should be closed or read less than 0.5 Ohms. If it is open or very high resistance replace it. Good luck to you. I hope thishelps

Posted on Jul 26, 2009

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SOURCE: 3.1 L Grand Prix-cooling fan won't kick on, new

probably not a relay,check the coolant temp sensor to make sue its reading ok,if its misreading it will not tell the computer to turn the fan on

Posted on Oct 14, 2009

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