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Car Forum / Honda Cars / March 20061986 Accord AC Question
I have the carb model 5 speed. The AC light comes on in the dash, but the compressor doesn't turn on. I traced wires and when I checked for power to the compressor, it ran when the test light probe touched the wire. It also works by direct power to it. I assume there are relays for it. I also noticed a switch on the line, assuming it's for low coolant pressure. My question is, will low coolant prevent the compressor from activating? I need to switch it over to 134, but don't want to waste time and coolant until I trace the problem down. My repair manual doesn't mention anything about this other than taking it to a qualified technician... Thanks for your help. John >I have the carb model 5 speed. The AC light comes on in the dash, but the >compressor doesn't turn on. I traced wires and when I checked for power to [quoted text clipped - 9 lines] > > John Ah, I love those cop-outs in the manuals. The funny thing is that there is often some troubleshooting you can do yourself. I'd definitely check out the low pressure cutout switch. Usually you will get a long period of excessive compressor cycling before it refuses to work at all, but a large leak or a long time without using the A/C can skip you past that. Anyway, pull the connector off the switch (with the engine off) and measure the switch. It should have continuity. Alternatively, you can put a jumper in the connector to see if the compressor pulls in (engine and A/C on), but don't do that for more than a moment to avoid damage to the compressor... or replace the compressor connection with your test light. I am ambivalent about R-134a conversions. R-12 is outrageously expensive these days, but converted systems just don't work as well as unconverted systems of either type. Either way, if the pressure switch is what is holding the compressor off you will need to go to a pro - either to get the R-12 charge (you can't buy the stuff) or for a proper conversion. If it's not the problem, come on back and we can go deeper. Mike > Ah, I love those cop-outs in the manuals. The funny thing is that there is > often some troubleshooting you can do yourself. [quoted text clipped - 8 lines] > moment to avoid damage to the compressor... or replace the compressor > connection with your test light. I found and jumped the low pressure switch and it seemed to work. I did the 134 conversion myself with new o-rings, oil, and the refrigerant. Cooled to 48 degrees. It could probably take another small can, but it's working. At least for now. Leaks may show in a day or so... > I am ambivalent about R-134a conversions. R-12 is outrageously expensive > these days, but converted systems just don't work as well as unconverted [quoted text clipped - 6 lines] > > Mike Thanks for the help. John |
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