Question about 1996 Oldsmobile Aurora
There is this water temperature switch that would activate your fans as your water reach high tempearture..it 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
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
Posted on Aug 19, 2008
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