1982 AC not working
Racer
Joined: Aug 2014
Posts: 479
Likes: 93
From: Tennessee
Did you short the low pressure switch when you added refrigerant? It's the only way I can get enough into a flat system and draw the enough refrigerant in to allow the clutch to engage.
Last edited by ykf7b0; Jul 3, 2020 at 11:31 PM.
Advanced
Joined: Nov 2016
Posts: 95
Likes: 28
From: Southern MD
R-134 or R-12? So the whole system is 36 psig if the compressor has not run. If ambient temperature is 70 degrees F. The static (saturation) pressure should be about 70 psig for both R-12 and R-134A. At 90 degrees F ambient temp the pressures should read about 100 psig if you have some liquid refrigerant in the system. I agree with ykf7b0 that you need to bypass the low pressure switch or find a way to get enough refrigerant in the system to allow the low pressure switch to reset so it can cycle to allow charging more refrigerant.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 191
Likes: 4
I just spent an hour with the speed control wiring diagram. The switch only operates on high speed and the heater control does not change where the air is coming from - always from the heater under the dash.
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Melting Slicks
Joined: May 2002
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From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
If you have 12 volts on the 3 different wires (while changing fan speed) going to the resister pack then the issue will be in the wiring between the resister pack and the blower motor relay. The voltage should be lower coming out of the resister pack for each coil (resistance wire) going to the blower relay. Try the blower relay to start and see if the wires from the resister pack are sending voltage there then from there to the blower motor.
If you only have 36 psi chances are you don't have enough pressure to reset the low pressure switch.
Neal
If you only have 36 psi chances are you don't have enough pressure to reset the low pressure switch.
Neal
Last edited by chevymans 77; Jul 4, 2020 at 11:33 AM.
Pro
Joined: Mar 2020
Posts: 500
Likes: 27
Picture of your gauge being used?
