Question about 1996 Oldsmobile Aurora

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My car is overheating because my fans arent coming on when the car gets hot but they work when the a c is on

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  • vtriplette Jul 30, 2008

    thank u

  • BMidd Aug 09, 2008

    I have the same issue. The fans somtimes wont come on untill the AC is on. I have found the relays and fan fuse I believe in a box under the hood. Can I test these or do I need to purchase new ones? Where is the temp sensor for the fans located? Please help I am desperate !!!



  • bigsampson Feb 21, 2009

    Went through two thermostats, and my car is still wanting to over heat. I have went through a lot of Dex Cool, have no clue where the hell its going as i have yet to find a puddle under my car. Water pump works. Thermostat was replaced the second time and on the way home it overheated again. Fans turn on and run fine it seems. No idea whats going on. Also on the way home when it began to overheat and afterwards it has some acceleration problems.

  • kimnwright Mar 13, 2009

    car is overheating. i have replaced the fan relay and thermostat but the fan is only coming on (sometimes) when I turn on the ac.



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There is this water temperature switch that would activate your fans as your water reach high passes thru a fan relay also so you must determine which of the two is the culprit.

if you found the temp switch( this is different from the temperature sending unit.) (please refer to your electrical diagram) it is normally a single wire where in if it is working, as you pull the wire from the switch, the fans should come on.

if it did not, you can trace the relay that runs the fan. check if it has control voltage. the power that energizes the relay. with out the control voltage , your fan would not run too.

if there is, then your relay is the culprit.

tnx 4 using fixya,

i hope i was able to help,


Posted on Jul 30, 2008

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According to the GM dealer, there are three relays that interact with the cooling fans. In my case, the fans and relays were fine, but some of the wires leading up to the relays or to the fans themselves were damaged, presumably from engine heat and old age. This caused the fans to operate erratically or sometimes not at all. Once the wires were inspected thoroughly and replaced as needed, everything's cool so far.

Unfortunately, I know first hand these cars can tend to run hot, which spells disaster for the aluminum engine block. Particularly if the pesky Dex-Cool seems to be seeping out everywhere causing the coolant to be low and your driveway to be stained orange.. (I have a fix for that on request).

If you do have to replace the fans and relays, a company called Zirgo makes high-tech, high CFM replacement fans that seem reasonably priced for what you get vs. what the GM guys might charge. They also have a solution that uses a radiator hose sensor probe and a digital control box you can experiment with and set to turn the fans on at any coolant temperature you want.

I ended up not having to go this route so I didn't test this, but it makes sense to me. If one or more of my fans fail, I would probably give this type of setup a shot. It looks relatively easy to install the fans themselves as replacements. The digital switch option requires additional relays and wiring.

Best of Luck!


1996 Oldsmobile Aurora
4.0L DOHC 32V V8
Autobahn Option

Posted on Aug 19, 2008


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