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Valves on York Compressor

70rustrunner on Sat July 05, 2008 10:04 PM User is offline

Year: 1966
Make: Ford
Model: Mustang
Engine Size: 289
Refrigerant Type: R12
Ambient Temp: 85
Country of Origin: United States

I have a 1966 Ford Mustang with the original York compressor. Do the valves on the compressor need to be screwed in or out during evacuation and charging. Thanks.

GM Tech on Sat July 05, 2008 10:46 PM User is offline

if they are the three-way isolation valves - then only half way opens communication to the system, to the compressor and to the gage set-- and they are usually right hand threads as I recall-- never open them all the way- this puts the system into isolation and you only have communication to the compressor and gage set... you will blow a compressor head gasket if you try to run it like that-- been there done that 20 yrs ago.....

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

70rustrunner on Mon July 07, 2008 10:30 PM User is offline

Two questions then.

How do know if they are 3 way isolation valves?

When would the valve be closed all the way?

Thanks.

GM Tech on Mon July 07, 2008 11:51 PM User is offline

These should help................



and



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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

NickD on Tue July 08, 2008 11:07 AM User is offline

Surprising what a guy can forget in a couple of years, first step was to identify the hi and lo sides, not too difficult, the hi side shoots into the condenser and since I have a short memory, a magic marker was an aid. Removed the caps to learn some idiot used channel locks to turn the valve, filed that clean so I could use a 1/4" square socket that would slide on and off without the use of a hammer, 3/8" drive to a ratchet wrench to quickly open and closed the valves.

Then with the manifold gauges securely connected and valves closed, engine off, learned which way to turn the valves to check the stop to stop clearance, I wouldn't bet a penny on this as to the rotation nor to the number of turns, kind of recall CCW and four turns, so two turns should the center.

If you have any refrigerant left, opening the valve would release it unless you had the gauges installed with the valves closed, that would be the top drawing in GMtechs figure.

The center drawing is for removing the compressor, that is kind of neat because you can do that without recovering the system, wish they were all that way. In my case, had good static pressure and decided to do a top off with this 24 year old system. Good to have at least four cups of coffee and to tell the wife, no telemarketing calls please, just hang up.

Since I was using cans had to release the lo side to purge the line by slightly opening the can valve, had the AC on, blower at max, and used a wedge on the carb for 1,500 rpm, after a few seconds guess, tightened the low side Acme fitting and closed the can valve, open the compressor valve, then the can valve and let the compressor suck the can dry. Closed the compressor lo side valve, then the can valve, installed a fresh can and repeated those steps. The high side guage valve was closed, but the high side compressor valve was opened to mid position so I could also read the high gauge while charging. Used my electronic leak detector on the closed compressor valves to make sure they were tight enough for no leaking. A guy can get carried away and wreck these valves by going too far either way. No torque specs that I could find, left that to the feel of years of experience.

I think I made notes of this, if I did would be in my stack of manuals, if I can remember where I stored them.

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