My wife was driving our Sierra today and had the A/C stop working. I checked it out and we didn't have a blower on any speed, yet determined that the blower works when hooked up to direct 12v. The resistor looked okay on the outside, except that the 7-wire plug had the insulation burnt up the ground wire about 3/16". I needed a lot of force and a screwdriver to pry the plug out. The "E" wire on the plug had melted to the resistor side (female) plug housing. I replaced the plug and resistor. Blower has all speeds and is working like it should.
But, when we start up the vehicle and turn on the outside vent, the drivers side goes to A/C (compressor kicks in) and the passenger side goes to full hot; like the blend door actuators are having issues along with the A/C having a mind of its own. My wife says it just happened and she wasn't touching the controls when it initially went out. Could the electronic controls in the dash have fried and caused the blower resistor meltdown? It's either that or two actuators and the A/C are acting up together. BTW, the blower works great even with the A/C and heat having issues.
2005 Sierra 1500 SLE Crew
5.3L "T" engine RWD
Resistor is "4-hole" type
HVAC has dual manual controls, no front console, no rear blower
But, when we start up the vehicle and turn on the outside vent, the drivers side goes to A/C (compressor kicks in) and the passenger side goes to full hot; like the blend door actuators are having issues along with the A/C having a mind of its own. My wife says it just happened and she wasn't touching the controls when it initially went out. Could the electronic controls in the dash have fried and caused the blower resistor meltdown? It's either that or two actuators and the A/C are acting up together. BTW, the blower works great even with the A/C and heat having issues.
2005 Sierra 1500 SLE Crew
5.3L "T" engine RWD
Resistor is "4-hole" type
HVAC has dual manual controls, no front console, no rear blower