Join Date: Oct 2009
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I wasn't brave enough to try your test. My alternator went out the following day, and I thought this may have something to do with the A/C not working. With the truck running, I'd see 11.5 V at both of my batteries. You mentioned the compressor was controlled by an electromagnetic clutch. So, I thought maybe my voltage was too low, causing the clutch to disengage at times.
I replace the alternator and now see around 14 volts at both batteries. But, that didn't help my A/C problem as it still stops randomly. The last leg of our trip was a 6 hr drive, and for some odd reason it worked that entire 6 hrs. So, the wife was happy.
Here's another clue that I just noticed. When my A/C compressor stops, I also lose my vent thermo control. No matter what temp I have my dial set at, when I'm on "vent", I get really hot air. We noticed this because one of the days the A/C quit it was around 74 degrees outside. It was a sunny day, so you still needed the A/C. However, my A/C stopped working around 20 minutes after we took off. So, we tried just running on "cold" "vent". The air coming out was VERY warm. So, we ended up rolling down our windows to stay cool. Not fun in I-90 with all the noise.
But, the next leg of the trip, the A/C worked fine for 6 hrs straight. With the A/C working, I could turn the A/C off, switch it to "cold" "vent". The air felt the same temp as what was actually outside.
I've since made the test when the A/C compressor works, and the thermo control works then as well. When the compressor stops, my regular vent always blows hot.
Is there a vacuum line or something else that could be causing my grief here?