2005 Express van A/C help needed
#1
2005 Express van A/C help needed
Been trying without any luck to get my A/C to work through the PCM. A little info to start off with, I have a 2003 Silverado 6.0 4l80e with DBW which has the A/C that's turned on through the serial data line. I needed a 12v A/C request, so I rewired the harness like a 2005 Chevy Express van 6.0 4l80e DBW which has the older style 12v A/C request. I had the PCM tune changed to the 2005 van, but the A/C won't come on. I can command it on with a scanner, so I'm reasonably sure it's wired correctly, but sending 12v to the C2-17 wire on the PCM does nothing. Even the guy doing the tuning says there's no reason it shouldn't work, but it just doesn't. Anybody been through this??? Any help would be greatly appreciated.
As a last resort, I guess I'll have to just use the 2 pressure switches and try and bypass the PCM all together, but really would like to try to avoid going that route.
As a last resort, I guess I'll have to just use the 2 pressure switches and try and bypass the PCM all together, but really would like to try to avoid going that route.