Back in AZ about a year ago, my AC would work flawlessly and then just stop, blowing out warm/hot air. It would happen about 1 in 10 ten times between trips. After I shipped it to Hawaii, after several months, the same thing but it had flipped to stopping 9/10 times only working 1/10 trips. My initial reaction was its low on freon and the low pressure switch was kicking it off so I topped off the freon even though it was sufficient. I also added a pusher fan many years ago and thought the relay I tied into the clutch line was going bad and dragging down the voltage as I measured ~11 volts when it was on so I disconnected the added relay but still had the low voltage issue on the clutch line. I replaced the AC clutch but same thing. Then one day when I was troubleshooting again, I realized there was 2 volts on the same clutch line when the key was turned to 'On' but the engine not started so I started tracing it back. What I eventually found was that the 'AC' button on the AC control module was causing the issue. I'm thinking the higher humidity of Hawaii vs the low humidity of AZ accelerated oxidation of the switch. If I physically pushed it hard in the upper left corner of the button, AC clutch would kick on (and voltage was now correct) but as soon as I took some pressure off of it, it would kick off. I took it apart down to the bare switches and tried to use contact cleaner on it but it didn't work. In the end I hooked up a bypass switch (in parallel) to the AC switch and its been working 100% now for about two months. Another indication that the switches are oxidized is the 'High Speed Fan Button' hasn't worked for years meaning, Low, Med, Medium High work properly but the High speed button blows like the Low Speed button. That's still the same and I was prepared to purchase a new AC Control Module (no matter the cost) but I can't find one and everything out there is used which I wont buy because of this issue.
So for now, I'm using a separate 'AC' button which is kinda ghetto but whatever, maybe I'll tackle it again later when I have the itch to try and fix both switches. As for the bypass switch, in the picture its the lit red switch under the AC control Module. The blue lit one is for the electric pusher fan when I tow(ed), or at low speed 4x4ing without AC on, etc.
So for now, I'm using a separate 'AC' button which is kinda ghetto but whatever, maybe I'll tackle it again later when I have the itch to try and fix both switches. As for the bypass switch, in the picture its the lit red switch under the AC control Module. The blue lit one is for the electric pusher fan when I tow(ed), or at low speed 4x4ing without AC on, etc.
