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Old 06-16-2019, 10:19 AM   #1 (permalink)
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So I’m having a problem with my air conditioning, these are the parts I’ve changed to try to fix it so far, evaporator, expansion valve, the drier, hi/low pressure sensor all new orings and seals, all the valve stems. And still the same issue. The issue is I’ll turn my air conditioning on and nothing but hot air, then 20 min later it all the sudden kicks on and is cold as ice. Sometimes it won’t turn on at all. It’s like sporadic it’s driving me crazy. I put all new r12 in it and I put a little shy of 3 cans because it calls for 32oz’s. However when I take the fuse deal out sorry it skips my mind what it’s called and run straight power to the compressed it kicks on every time and yes I did change that module or sensor out as well. Any help would be appreciated. I’m hoping not to change the compresser because like I said every time I run straight power to it, it works fine. Thanks guys. (Solves) ac relay fuse box wasn’t getting a good connection to the relay. When it was hot yesterday I got mad got out of the car popped the hood and pulled the relay all the sudden I heard click and the clutch engaged, I put it back in and nothing, I then started to move it back and forth, left to right. And it started clicking on and off so i pushed it toward the fender and it finally stayed on. Since I was over an hour away from home I grabbed a empty gum pack and shoved it in between the closest relays to the front and just like that it stayed on, and was the coldest ride home ever. I had changed out almost every ac component except compressor and digital controls. So o think I’ll try and find a new relay box. Thanks hope this helps someone in the future that’s having a problem like mine.

Last edited by Stez; 06-30-2019 at 05:35 AM. Reason: Solved
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Old 06-16-2019, 12:08 PM   #2 (permalink)
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So basically if you hotwire the compressor straight it runs, but normally it takes 20 minutes before the compressor kicks on? If you replaced the pressure sensor with a known working good one it rules out it being a pressure problem. I'd say it was wiring/electronics related. Maybe it is the climate control unit itself? Your post history suggests you have a VR4 and therefore the "complicated" climate control unit. Maybe check it for leaking capacitors? If the climate control unit is faulty it would make sense that the call to turn on the compressor would be delayed/faulty.
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Old 06-16-2019, 01:24 PM   #3 (permalink)
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Yes correct if I hot wire it, it turns on instantly, sometimes it won’t even turn on at all while driving yesterday I drive 50 miles and no air conditioning the whole drive, I stopped and fueled up turned my car on and right when I got on the freeway to head home all the sudden. Cold air the whole way home. So strange. But I think you are on to something!!!!
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Old 06-16-2019, 01:26 PM   #4 (permalink)
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Oh and yes I apologize it is a 1991 vr4.
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Old 06-18-2019, 09:21 AM   #5 (permalink)
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If everything mechanical is working correctly, then it points to an electrical issue. Either the climate control unit itself has an intermittent fault, or the wiring going to the compressor is shorting out somewhere. Also just to cover something very basic, the AC is turned on right? You should see a little blue snowflake symbol behind the "dash" diagram on the LCD like this.
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Old 06-25-2019, 02:22 PM   #6 (permalink)
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Yes i make sure that snowflake is on, so I’m going to try finding part mb942560 and see if it’s the thermostat sensor or the revolution sensor. I did some reading and the climate control unit, and then sensors are the only items left to check. However they are discontinued. So I’ll try to check mine or find a known working used one.
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