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Re: 1987 Saab 900 AC question..
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Posted by JerseySaab [Email] (#666) [Profile/Gallery] (more from JerseySaab) on Wed, 29 Jun 2022 21:16:26 Share Post by Email
In Reply to: 1987 Saab 900 AC question.., Goblin [Profile/Gallery] , Wed, 29 Jun 2022 19:28:37
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If the shaft seal had blown out it would of course be leaking. You'd see oil dripping down the front of the compressor if it had a serious leak.

As long as you're sure that there's enough refrigerant and oil in the system to lubricate the compressor you can temporarily wire the clutch coil directly to +12 volts on the battery to test it. If the compressor works that way you know you have an electrical problem somewhere and you'd need to work your way back through the circuit.

If the compressor doesn't work that way then the clutch coil is shot. Note that there is a diode in the clutch coil wiring to prevent voltage spikes from backfeeding into the car's circuitry. If that diode fails the clutch coil won't energize.
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