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OOPS ! Now, it sounds like the A/C relay is constantly on. In the power distribution box by the battery, try swapping another relay for the A/C relay (which turns the compressor on), and see if it now stops. If so, buy a new relay. Good luck.
on the 92 civic you have 2 sensors for the coolant, one is a coolant fan switch and the other is a temp sensor. the fan switch tells the computer to turn on the fans at a certian temp. i would suggest replacing the fan switch which is located on the thermostat housing. if that doent work it could be the relay. I have owned my 92 civic hatch for 10 yrs and have done all the work to it myself. Also a mechanic by trade. Hope this will help you out
If your fan is not working, its almost certainly the blower motor resistor. Also called blower control switch. They go out a lot on Civic from the 90s. Its under the dash board on the passenger side near the blower motor.
Need more info like is the compressor running , is the fan working and etc.
If the compressor does not run then it maybe out of freon, may have a blown fuse or bad relay, if the compressor is running then you may have a restriction , stopped up orfice tube , bad drier or even a bad compressor.
If you have no knowledge of A/C units then I suggest you find someone who does.