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I am a disabled vet so you know is rouph working on my own car but here goes.
I turn my a/c on green light comes on and stays on like normal but the a/c clutch does not engage I checked for 12v and found none .
I checked fuse relay and wires with no luck . I tried putting 12v to a/c clutch and it did not engage . I am unsure what the OHM value is for the clutch if I check it with a meter. If just the clutch is bad can it be replaced without losing the refrigerant ? The belt is ok and turns normal I am not sure if the a/c clutch goes bad it may take out the computer.
The engine also does not idle up like it did when the a/c was on
Any help is really appreciated.
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Welcome to the forums!
I would start by attaching a A/C manifold gauge to the high and low side ports to see if you actually have any freon on your system.
With you having a 91, you still may have R12 unless it was converted to R134a.
I would also check a wiring diagram to look at your low and high side pressure switches and see how the system works.
I got my morphine turned down a little to clear my mind some . I looked at my factory manual electric manual and the main factory manual and found that I was testing the wrong spot for voltage . I found the power wire that goes right to the a/c clutch and no power at all . I put 12 volts to it and it clicked and ran when the engine was on but no cooling . I do not have gages but I found the the pressure sensors are open causing all the voltage to stop right there . I am pretty sure it out of r12 . I can not afford to have to changed over to r134 . I am most likely going to buy a can on ebay and see if it all leaks out. I may see if I can get both on ebay . I have heard there are R12 replacements like freeze 12 and others . I do not know if you have heard of any good one . I can tell you when your mind is clear
you can read those factory manuals and they tell you exact where to go.First off, as above, thank you for your service to our country. Next, I would suggest that the cost of even a pound of R12 will likely be close to the cost of having the vehicle taken to a shop and professionally serviced. HVAC work is about the only job (other than automatic transmissions) that I suggest being left to the professional technicians. You will often do more harm than good, and you could be harmed by the refrigerants involved in an HVAC system on a car, especially if you are a DIY guy, like most of us are. Good luck sir, and again, thank you for your service.
First thank you for your service.
As for your AC problem you really need to start by checking the pressures in the system so as suggested a manifold gauge is a good place to start. The thing is that AC problems can be complex and expensive and are rarely cut and dried, therefore I would recommend you take it somewhere to have it diagnosed, pay them for the diagnosis and do the work yourself, this way you would be able to save some money but you SHOULD have a reasonable idea of what is causing the AC not to engage otherwise you may be fighting this for some time and not get a satisfactory result.
Yea I think you’re headed down the wrong path there as R12 is out of production and the cost is prohibitive. I think the reason that it’s not turning on is because it’s low on pressure or has none at all but the CAUSE of that has yet to be determined and as I said in my previous post there are about 100 different things that can come into play here. AC work really isn’t for the DIY, it’s one thing if you’re topping off a little R134 that’s leaked out but quite another to diagnose and repair a given problem. I would once again recommend taking it somewhere to have it retrofitted and diagnosed, you may be able to do the repairs yourself if you’re looking to save money but in the end if you’re not familiar with the system and how it’s suppose to work you could end up causing damage that could cost you a whole lot more.
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