The question I have is this, I have 92 GTA with twin fans witch one is the primary and witch is secondary? The fan that comes on with the ac is that the primary or secondary? The next question is when you ground the wire on the fan switch on the passenger side head the fan that runs is it the primary or the secondary? The last question is what controls the fan that doesn't come on when you ground the fan switch? Thanks for any help!!!!

 

I think ...

that the primary is computer controlled and the computer gets it's temp info from the CTS located by the water neck - should come on around 210ish.

The secondary fan is controlled by the fan switch in the pass side head, it should come on at 230ish. Grounding this switch should make the secondary fan come on.

The A/C should also make the secondary fan run, regardless of any temp reading anywhere.

I don't have the dual fans, but this is what I understand from reading other posts here.

 

Thanks for the help I checked the car when I got home and the driver side fan is bad.