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Old 04-23-2022   #3
1991 Corvette ZR-1
 
Join Date: Sep 2018
Location: Florida
Posts: 306
Default Re: Troubleshooting AC leak before charging with R134a

Quote:
Originally Posted by XfireZ51 View Post
Following this. I just installed a ?newer? condenser. In my vacuum testing, I am able to pull -29? vacuum but lose it all within an hour or so. I didn?t realize you could test high and low sides individually.
I pulled the new compressor hoses off the compressor and in the process of vacuum testing the system closed off now minus the compressor. There is a schrader valve on the compressor that will allow me to pull a vacuum on the compressor all by itself. So we will see if that unit can hold a vacuum as well. The condenser sat on the shelf for months until I removed the plastic fittings and was greeted with a loud pop and hiss so it was vacuum sealed and held it this entire time, I am going to rule that part out.

Knowing my luck, it will probably be the evaporator. Only way I can think of to check the system if these other parts check out separately, is charge the system and run it then look for leak with a UV light. Maybe pull the fan motor and peak in with the light to see if any leaks are showing on the evaporator.

I would strongly consider a custom eliminator pulley at this point! Pull it all off and lose some weight in the process.
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