avslash
Full Access Member
Anyone have any relevant experience diagnosing hvac problems? I'm conversant in auto ac systems, but don't have a lot of hands on experience.
While driving, my truck will normally blow cold air as expected. However, it will intermittently start blowing warm air despite no changes being made to the temperature controls. When it does this, completely turning off the hvac system and then restarting it will usually resolve the issue, but sometimes you might need to cycle it on/off several times for it to resume blowing cold air again. Once it is blowing cold again, it might work for hours, or you might have to do it again after a few minutes.
When it is blowing cold, it blows as cold as it ever has, so there has been no reduction in cooling performance. The system has also been charged by a reputable shop within the last couple months after the shop repaired a leak in the refrigerant lines going to the rear hvac unit, so it is very unlikely to be a refrigerant charge issue.
Because the system can operate normally, I'm wondering if it is an intermittent problem with compressor engagement. I know these trucks don't use a traditional ac clutch, but some type of solenoid system to engage/disengage the compressor.
I do have a IID tool, and no relevant faults are being thrown, so what should I be looking at?
While driving, my truck will normally blow cold air as expected. However, it will intermittently start blowing warm air despite no changes being made to the temperature controls. When it does this, completely turning off the hvac system and then restarting it will usually resolve the issue, but sometimes you might need to cycle it on/off several times for it to resume blowing cold air again. Once it is blowing cold again, it might work for hours, or you might have to do it again after a few minutes.
When it is blowing cold, it blows as cold as it ever has, so there has been no reduction in cooling performance. The system has also been charged by a reputable shop within the last couple months after the shop repaired a leak in the refrigerant lines going to the rear hvac unit, so it is very unlikely to be a refrigerant charge issue.
Because the system can operate normally, I'm wondering if it is an intermittent problem with compressor engagement. I know these trucks don't use a traditional ac clutch, but some type of solenoid system to engage/disengage the compressor.
I do have a IID tool, and no relevant faults are being thrown, so what should I be looking at?