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1992 Cadillac Deville AC system

Tiny
SEAN030888
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 4.9L
  • V8
  • FWD
  • AUTOMATIC
  • 148,000 MILES
Hi I am having a problem with my ac system. When I put refrigerant in the system it charges 10oz. That is it. I try to turn the controller to auto it stays in Econ with service ac system. It won't charge anything else in the system and the clutch will not come on. I get error codes F46 F47 F48. Any idea. I was curious about the low pressure switch. Or the ac clutch switch. Can I run a wire from the battery to the ac clutch switch and see if it kicks. If it does I know what it is if it doesn't I am not sure at that point. I just don't want to mess anything up that's why I came here first. Thanks.
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Wednesday, June 10th, 2015 AT 2:29 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You definitely don't want to be running any direct wires. The computer is shutting it down for a reason.

Those codes relate to low refrigerant charge. This system is designed to be filled with a charging station with the engine off.

You should be able to disconnect the battery to clear the codes and the system will start up again. You may have to do this a couple times before you get enough refrigerant in the system so it will continue to run.
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Wednesday, June 10th, 2015 AT 4:59 PM

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