E fans stuck on low speed all the time????
Thread Starter
Teching In
Joined: Dec 2005
Posts: 42
Likes: 1
E fans stuck on low speed all the time???? Can't seem to find a fix for this on any forums. I did the electric fan swap on my 2000 silverado and the fans stuck on low speed all the time once the engine is started. I can shut them off and turn them on with hp tuners scanner so I know the relays are not stuck on. I used pin 42 to control the fans and programmed the ecu to control them. the fans and relays are from and wired up the same way as the 2005-up electric fan trucks. I converted the a/c clutch circuit to provide a ground control for high speed and it works. but for some reason after I start the truck and the engine is running the pcm grounds pin 42 and turns the fans on low speed. My tune is attached
Thread Starter
Teching In
Joined: Dec 2005
Posts: 42
Likes: 1
E fans stuck on low speed all the time solved! This worked thank you! This solved my fan problem. I had fan#1 hooked up to low speed and I used the a/c clutch wire and a relay to provide ground for high speed fans . My fans were on low speed all the time, the pcm was grounding pin #42 after I started my truck . I could only shut them off with the scanner. Under the a/c tab the recirculation Fitted option should be set to Fan #2 and Type Fitted needs to be Analog for proper operation. I thought I would be ok with leaving the pcm opening the recirc door when compressor pressures got high because I was using the a/c circuit, not fan #2. But it has to be set to fan #2 and analog or fan #1 wont work either.
