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A/C Basics
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Automotive A/C FAQ's
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There were 23 questions found in this category:
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 A Word about Safety
Automotive air conditioning service should only be performed by trained personnel. Service technicians should always have the proper e...
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A/C Flush FAQ
Question:
When should the system be flushed?
Answer:
We believe if the a/c system is opened for service, it...
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Air Powered A/C Vacuum Pumps
Question: Can I use an air powered vacuum pump instead of the more expensive electric vacuum pump? What's the difference.
The purpose of a vacu...
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Automotive Refrigerant Leak Sealers FAQ
This article courtesy Cool Profits Magazine
This is an updated version of an article which first appeared in Cool
Profits Ma...
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Can You Explain the Purpose of a Receiver-Drier?
The receiver-drier is found on
systems that use a thermal expansion valve. This type of metering valve
requires liquid refrigerant. Therefore, to en...
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Differences between R12 and R134a
One of the differences between R-134a and R-12 is the boiling points. Pure R-12 will boil at -22 degrees Fahrenheit while R-134a boils at -16 degrees ...
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Do I Really Need to Change my Receiver-Drier/Accumulator?
Desiccant is used to trap the moisture inside your A/C system.
The receiver-drier and accumulator contains a bag of dessicant which is used to trap...
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How do I use the gauge set with my vacuum pump?
If your ready to vacuum an empty system, you begin by attaching the middle hose (yellow) to the vacuum pump port. With both manifold valves turn...
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How Refrigerant Flows Through the System
The following explanations
that describe the flow of refrigerant were taken from the bulletin
board. They were all good, and each describe the flow ...
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Lost Refrigerant License
I had an R12 license and lost it. How can I get a new one?
It would really help if you knew who the original credentials came
from. Looki...
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Micron Rating of a Vacuum Pump
Question: What's the story with the Micron rating of a vacuum pump? I'm assuming that smaller is better, but what does it mean as far as practical app...
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Pressure Chart Question - Readings with Compressor On or Off
Question: I am chargeing my 1992 ford auto air conditioning. Looking at the pressure chart it has ambient temp, low side p.s.i and high si...
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The First Step to Successful Refrigerant Leak Detection
A complete visual examination is the first step in the leak detection
process.
Before you pick up that electronic leak detector, take a close look...
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Troubleshooting with Gauges FAQ
A visitor comes to us with questions about what might be wrong with the a/c in their car. It goes something like this. My air conditioning was working...
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What are the Benifits of Leak Testing with Nitrogen?
We fond the answer to that question in an article which first appeared in
the May/August 2001 edition of Cool Profit$
Magazine. This article was w...
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What Does it Mean to Flush the A/C System?
Flushing must be performed when the system is contaminated or you suspect there is debris in the system from compressor failure.
When a/c compressor...
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What is Black Death?
Black Death
The subject of system flushing
would not be complete without discussing Black Death. Below you will
find an interesting article which f...
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What is Section 609 (MVAC) Certification?
Since 1993, all technicians
performing automotive a/c service for consideration must certify to the
U.S. EPA that they understand how to properly ha...
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What is Superheat?
ACProf was kind enough to explain the meaning of Superheat for us. The following text originated from the A/C forum. The original me...
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What Oil to use on O-rings?
When replacing A/C system O-rings, it's always recommended to lubricate all O-rings with clean 525 viscosity mineral oil. Oil on ...
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