1999 k3500 4x4 7.4l 5 spd
AC just stopped working after shop removing cats/welding in pipe - still have o2s - no tune yet
EGR is not plugged in either if that may have anything to do with PCM not turning ac on...
low/high pressures almost equal say 70 low, 79 high
Jumped low pressure switch - nothing happens - reads 13.5v
Jumped relay - kicks on, switched with fuel pump relay. No change.
Jumped high pressure - aux fan comes on
Lead me to believe climate control module
https://www.silveradosierra.com/how...-trucks-hvac-control-unit-t77522.html#p850002
bridged C-E on transistor on circuit board with solder, nothing changed
I have been lead to believe if clogged orifice tube compressor would still come on.
AC just stopped working after shop removing cats/welding in pipe - still have o2s - no tune yet
EGR is not plugged in either if that may have anything to do with PCM not turning ac on...
low/high pressures almost equal say 70 low, 79 high
Jumped low pressure switch - nothing happens - reads 13.5v
Jumped relay - kicks on, switched with fuel pump relay. No change.
Jumped high pressure - aux fan comes on
Lead me to believe climate control module
https://www.silveradosierra.com/how...-trucks-hvac-control-unit-t77522.html#p850002
bridged C-E on transistor on circuit board with solder, nothing changed
I have been lead to believe if clogged orifice tube compressor would still come on.
