Well Subject says it all, My 89 Camaro 5.0L TBI electric fan will only turn on with A/C. So is there anyway to find out why it isnt turning on with Engine reaching Red Mark on Temp Gauge?

 

Thermal switch in the pass side cylinder head. Also, before someone else says it: A on this site will usually provide a wealth of info.

JamesC

 

May I suggest a seperate fan controller? I've had the same problem in my 1990 TBI motor, and I've been through 3 fan switches, and one was a fancy high dollar ($85) job, and even it went out after 2000 miles.

I gave up, and went with a seperate fan controller, they range from $40 to over $250, depending on what you get - I spent $90 on a nice one from Flex-A-Lite - on at 220, off at 160, adjustable, and variable speed, with ability to add always on or always off switch. A probe inserts between the radiator fins, wiring was easy, and it ALWAYS works the right way. I'll never return to those in-the-head switches again!

You can just leave the dead fan switch in the head as a plug, install the seperate controller, and be done - no more coolant in your face to change that factory crap.