Cooling Fan Always On - Any Suggestions
04-17-2012, 08:09 PM
#1
TECH Enthusiast
Thread Starter
Join Date: May 2008
Posts: 537
Likes: 0
Received 0 Likes
on
0 Posts
Cooling Fan Always On - Any Suggestions Over the last couple days both cooling fans come on as soon as car starts. They don't run with engine off and I checked relays - appear to be functioning OK. This is a cold start after sitting overnight. (99 Z28 - all stock)
After looking at wiring diagrams and some searching, I came to the conclusion it is either a bad ground or PCM is turning them on.
I started car and disconnected the A/C pressure switch. When I plugged it back in fans stopped. My guess is a bad A/C pressure switch but I'm looking for any other ideas before dropping $50 on a pressure switch that I won't be able to take back.
thoughts??
After looking at wiring diagrams and some searching, I came to the conclusion it is either a bad ground or PCM is turning them on.
I started car and disconnected the A/C pressure switch. When I plugged it back in fans stopped. My guess is a bad A/C pressure switch but I'm looking for any other ideas before dropping $50 on a pressure switch that I won't be able to take back.
thoughts??
Last edited by COPO9560; 04-17-2012 at 08:10 PM. Reason: forgot info
04-17-2012, 09:33 PM
#3
TECH Enthusiast
Thread Starter
Join Date: May 2008
Posts: 537
Likes: 0
Received 0 Likes
on
0 Posts
The guage reads same as always - cold when starting in morning, warm up and sits just under mid point when driving. If fans start tomorrow AM I'll pull this and see if anything different happens.
