Well ive checked most every thing i can think off, but the ac wont come on at an idle. Once the truck gains some rpm's then the ac will kick on. the only way i can make my ac work at idle is if i go and force it in with efi live, but once i disconnect from real time it just shuts off. any ideas
Seems like George had this problem a while back. You might try searching.
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
If the idle is too low the PCM won't enable the AC relay.
I see this a lot on old people's Suburban's and trucks and it's caused by a dirty throttle. I know you probably don't have a dirty throttle but check the idle speed anyway. If it's around 500 in gear it won't come on. Not sure the exact spec but it's somewhere close.
GM service information lists a lot of parameters but as far as RPM goes it says anything under 5000 RPM....which is not true.
well right now my idle is like 650-700 and even when i rev it up to like 900 still wont come on. but once i hit the 1k mark the ac will turn on. The motor doesent have problem turn the compressor at my idle either when i lock it in.
I have exact same problem right nowOriginally Posted by 6.0vortecchevy
Sometimes it acts like it kicks on for maybe 2secs and then cuts right back off.
2002 Tahoe 4.8 - soon to be turbo'd - SOLD
1989 Mustang - LX Vert - 351W-TT - 2inches of dust covering it
2012 Raptor - 497rwhp at 10psi
If you aint breaking - you aint going fast enough
exactly and yea it has no prob turning the compresser at idle when i manualy force it to.
Do you have a stock fan or electric fans?
Slowest in Oklahoma...
mine does the same...mine is because the idle is too low, when the compressor tries to come on it tries to die and the comp kicks back off, as long as i stay moving it works great....i guess i should just turn my idle up but im lazy and i dont sit in traffic much so mine still works ok
shouldnt have to run the idle up.
I am running an electric fan, but a/c does it whether fan is on or not
and my fan is not wired to turn on with a/c
2002 Tahoe 4.8 - soon to be turbo'd - SOLD
1989 Mustang - LX Vert - 351W-TT - 2inches of dust covering it
2012 Raptor - 497rwhp at 10psi
If you aint breaking - you aint going fast enough
I'll go out on a limb and suggest there is an adjustment needed in the tune on both problem vehicles then. There is hardly an electrical or mechanical problem I can think of that would make the AC not work below 1000 RPM but work fine above.
I'm not pointing fingers 'cause I don't know who has what tune but it would be worth the trouble to find out the compressor on parameters in the tune.
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