I have the dual fans in my Iroc, stock. They were working fine to my knowledge up until recently, and now: nothing. What things might I check here?

 

https://www.thirdgen.org/techbb2/att...&postid=997879

you need to do some testing on the system.

check the fuse first and work from their, you can also make sure the motors work by jumpering the relays in the right spots..

follow that diagram it should help.

 

The fans get the voltage through relays which are supplied voltage through a fusible link. The voltage on the contact side of the relay is always hot, the voltage on the coil side is key controlled so the fans turn off after the engine is shut down. Pull one of the fan relays and look for 12v at ONE of the heavier wires in the relay plug. It should have 12 with or without the key on, next turn the key on(engine can be off) and measure one the lighter guage wires-one of them should have 12 volts with the key on. That covers all fuses and links if you get those readings. The fan relays are notorious for failing. You can substitute the heater blower relay for a test, they are the same. To force the fan on you can jump the ALDL connector like you would to get codes and the primary fan should come on as it self tests. Or you can turn on the AC. part# is NAPA AR-279 for the fan relays.