Re: O/T 93 Suburban a/c problem

Posted by Garry F(NC) on October 12, 2005 at 18:40:53 from (66.226.51.61):

In Reply to: O/T 93 Suburban a/c problem posted by Gene Davis (Ga.) on October 11, 2005 at 19:33:09:

Gene,
The pressure cycling switch(screwed into the accumulator usually) for R-12 are set to cycle off at around 24 psi in order to keep the system above freezing. Unplug the harness plug from the switch and jump across it ( I have even used a large paper clip un folded) Run the A/C if the pressure goes down into the 20-25 (low side) pretty fast it is probably a low charge. If the high side service port is the the liquid line like a lot of GM vehicles, the high side pressure reading will likely be around 150-200 with correct charge after the vehicle is cool inside.The liquid line is between the condenser and orifice tube. A clogged orifice tube will usually make the low side low and the high side too high (because of restriction) though this would be somewhat different on a vehicle with rear A/C. With a proper Refrig. charge a good rule of thumb is that the suction line should be good and cool and sweaty all the way to the compressor. I live in about the same climate,humidity etc. as you. Also check your radiator fan clutch for proper operation. With the vehicle at operating temp. when you stop the engine the fan should only 'coast' a few blades and stop, not keep spinning several revolutions. A bad fan clutch would not have anything to do with rapid cycling though. I have had pretty good luck converting to R-134A with most everything and the price of ot has peaked and come down some lately.
To all you folks on this site, I have been reading it for several years and really enjoy all of the forums.
Gene, email me if you have any questions
Garry F.

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