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1995 Chevy Blazer AC vacuum or not

Tiny
MADMIKE1735
  • MECHANIC
  • 1995 CHEVROLET BLAZER
1995 Chevy Blazer

this is for any vehicle. Not just the blazer as listed. My brother is a backyard car mechanic and says you dont need to pull a vacuum before charging any ac system. R-12, or 134a. I am a diesel mechanic, and do stuff by the book, when it comes to stuff im unsure of.I know you need to have a vacuum, but I am unsure of the reason. I always used a machine on everything, which when it filled the system, it also installed dye so you can find leaks later in time. I also checked the amount of refigerant that was needed in any vehicle I ever charged. What is the reason for a vacuum, and is he anyway correct not pulling one? Also, I believe a vacuum sucks debris out, which will in turn increase compressor life. All help is needed I want to prove my brother wrong.
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Saturday, March 7th, 2009 AT 8:24 PM

1 Reply

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
One of the main reasons to pull a vaccum as far as I know is to pull as much moisture out of the system so nothing can freeze up. It it doesnt help with debris to much because there is nothing that can be pulled out of the vaccum pump or the AC system. I have tried to charge vehicle with pulling it down, sometimes it works, sometimes it doesnt. But really I wouldnt suggest it
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Monday, March 9th, 2009 AT 8:04 AM

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