Having problems with your 1986 Nissan Pickup 4WD 1986 ?

A/c does not turs on and off auto, it stais on at all times. high pressure switch and relay have been change. olso the switch inside the cab.

Posted / edited by AnonymousUser on : 23-05-2022

Answers :

One of 2 things has happened here. Either the compressor clutch is seized to the pulley the belt rides on on the compressor OR the wiring for the clutch is shorted to a power supply. If the compressor clutch is stuck (seized to the pulley-usually with rust) on then the compressor will always turn with the engine. I have seen this several times over the years as I live in central new york where there is lost of rust on cars from salt on the highways in the winter. You can unplug the wire to the compressor and if it still spins with the engine running then it is siezed to the pulley. This WILL lead to compressor failure and WILL sieze the compressor due to overheating the compressor eventually. If the compressor does not spin with it unplugged and does when the wire is reconnected and doesnt stop ever while the car is running then it is shorted to a power supply somewhere. The Parasitic power problem can be hard to trace and is an unusual occurance. The clutch is probably locked up to the pulley but try my tests and you will know for sure.
\015\012 Good luck and DO NOT try to unplug or replug in the compressor while the car is running.
\015\012 Scott
Repair Help & Product Troubleshooting for 1986 Nissan Pickup 4WD 1986

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