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Old 08-20-2021, 02:28 PM   #1
Cesar Diaz
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Join Date: Jun 2016
Location: Stevenson Ranch, CA
Posts: 62
AC compressor chatter

I replaced a 1 year old AC compressor on my 72 c10 added the required PAG 46 oil, pulled a vacuum, verified no leaks, drew a vacuum for 1.5 hours more then added R134, at one point my scale got stuck and I ended up adding about a 1/2 lb more of R134 then I should have.

While loading the R134 all went smoothly. when I went to drive the care with the AC on it started squealing loudly so i shut off the AC and when I got home checked and the Compressor is intermittently locking up.

Could it just be that the compressor is bad or is the extra R134 the issue?
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1972 C10 Big Block 402 Cheyenne
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Old 08-20-2021, 02:50 PM   #2
body bolt
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Location: Albuquerque, New Mexico
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Re: AC compressor chatter

Quote:
Originally Posted by Cesar Diaz View Post
I replaced a 1 year old AC compressor on my 72 c10 added the required PAG 46 oil, pulled a vacuum, verified no leaks, drew a vacuum for 1.5 hours more then added R134, at one point my scale got stuck and I ended up adding about a 1/2 lb more of R134 then I should have.

While loading the R134 all went smoothly. when I went to drive the care with the AC on it started squealing loudly so i shut off the AC and when I got home checked and the Compressor is intermittently locking up.

Could it just be that the compressor is bad or is the extra R134 the issue?
Do you think you may have overcharged?
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Old 08-20-2021, 02:58 PM   #3
Cesar Diaz
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Join Date: Jun 2016
Location: Stevenson Ranch, CA
Posts: 62
Re: AC compressor chatter

yes by a 1/2 lb scale got stuck and I didnt realize it.
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Old 08-20-2021, 03:05 PM   #4
Davidf
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Posts: 749
Re: AC compressor chatter

What is your high side pressure reading and air temp across the condenser. Let's start there and go forward.
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