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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: Harmon on June 09, 2011, 04:50:20 pm

Title: How many lbs of R-134a?
Post by: Harmon on June 09, 2011, 04:50:20 pm

I have conflicting opinions on this....

I have 86 Chevy c-10 with r4 system converted.  Put new dryer, orifice, and r4 compressor in.  Put cans of r134a in.  Blew semi cold a while, then stopped blowing cold...obvious leak.

I want to put dye in to find where it is leaking....BUT  I do not know how many lbs of r134a is needed in the system.

Anyone have an idea?

Title: Re: How many lbs of R-134a?
Post by: KY..Rob on June 09, 2011, 07:34:45 pm

36 to 40oz should do it.

Title: Re: How many lbs of R-134a?
Post by: Skunksmash on June 26, 2011, 05:14:17 pm

I'm scared to do this cause that little valve can get old and give a false reading. Only way to tell with 100% certainty is to completely drain the system.

Title: Re: How many lbs of R-134a?
Post by: topp on June 26, 2011, 11:04:44 pm

Quote from: Skunksmash on June 26, 2011, 05:14:17 pm

I'm scared to do this cause that little valve can get old and give a false reading. Only way to tell with 100% certainty is to completely drain the system.

So based on your logic above, you don't trust tire gauges either cause those valves ge told and give a false reading?
Same valve, different seal.  They either open and close or don't...They don't give false pressure....