radiator fan not coming on with a/c 86 iroc. - Third Generation F-Body Message Boards

gaskincrew · 05-23-2009, 10:46 PM

my cooling fan is not coming on and its letting my a/c head pressure skyrocket to high, the fan cycles normal to cool radiator, just not coming on in time to lower my a/c head pressure,... any suggestions??? what controles fan during ac operation thanks..

bubbatwo0_0 · 05-24-2009, 01:19 AM

All i know is that when you set the control to max ac it works through that switch to turn it on so i would start there. It has to have a wire from there to the fan relay thats mounted between the battery and radiator.

Reid Fleming · 05-24-2009, 12:34 PM

Check my sig line.

What is your high side A/C pressure at? If you're low on refrigerant, the high side won't get high enough and the fan will stay off. But I'd check with some pressure gauges first.

gaskincrew · 05-24-2009, 11:15 PM

on the low side its going over 80 and compressor starts vibrating and i cut it off the high side starts pegging out to, i can manully ground the fan relay and fan comes on and pressures go down to normal and a/c cools , just dont know what should activate the fan relay when a/c is on and pressures get high enough that fan should come on??? any help is good.