I've got a 91 Firebird, 305 TPI, with two radiator fans. The one on the
passenger side runs constantly when the key is turned on. I've searched for
specific info on how it is wired but didn't come up with much. I'm curious
if this is the primary or secondary fan. I also need to know how the voltage
to it is sourced. Does it ground through a temp switch with the battery
positive always on? Is it always grounded with the positive switched from
the ECM? If the ECM switches the circuit I'm assuming it does that through a
relay. Where is the relay located (on the firewall? - which one)?. If it is
a temp switch where do I find it? Which A/C switches affect the circuit?
Does one A/C switch control both fans at the same time?
Gee, I ask a lot of questions. Any help that anyone can give me will be