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compressor cycling on/off too much

wgonzo64 on Sun June 07, 2009 2:44 PM User is offlineView users profile

Year: 1994
Make: chevy
Model: caprice
Engine Size: 4.3
Refrigerant Type: 134a
Ambient Temp: 78
Pressure Low: 35
Pressure High: 350
Country of Origin: United States

I was recharging my AC sytem , it help vacume at (26) for 25-30 minutes.
started regharging and found relay was open and not engaging comp. fixed that. 134a went in slowly and comp cycling on and off, to a point. It will not take anymore 134a and comp. stuill cycling on and off like on for 1 min off for 15 sec. the acumator gets cool when comp is cycling. when it off it gets warm.
Now several hours later the AC is cold but low side is 35 and high is 350. does this mean over charged and if it is what is the safest way to let some 134a out

TRB on Sun June 07, 2009 5:04 PM User is offlineView users profile

78 degree ambient and 350 psi on the high side means you have either over charged or you have another high pressure issue to look into! How much refrigerant is in the system at this point?

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wgonzo64 on Sun June 07, 2009 5:25 PM User is offlineView users profile

wgonzo64 on Sun June 07, 2009 5:29 PM User is offlineView users profile

I am not sure sine I was haveing problems with comp/relay I did not think is was going in so yes I think it is over charged i put 2 12 oz cans and maybe 2 or so lbs more from my 30 lb can w/out a scale I cannot be sure. how can I tell?????

GM Tech on Sun June 07, 2009 10:04 PM User is offline

You should have your 30 lb tank on a scale so you can "weigh-in" the proper charge amount..

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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......

Edited: Mon June 08, 2009 at 11:16 AM by GM Tech

Chick on Sun June 07, 2009 10:11 PM User is offlineView users profile

You need to recover the charge and start over, use a scale for your 30lbs tank and get the right amount in there, you can't guess... Hope this helps..

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Chick
Email: Chick

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