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Automotive A/C FAQ's

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There were 25 questions found in this category:
  1. A Good Electronic Leak Detector Makes All the Difference
    Electronic Leak Detection A good electronic leak detector is one of the best investments a shop can make.  I've tested quite a few over the last...

  2. A Word about Safety
    Automotive air conditioning service should only be performed by trained personnel.  Service technicians should always have the proper e...

  3. A/C Flush FAQ

    Question: When should the system be flushed?

    Answer: We believe if the a/c system is opened for service, it's a good time to...


  4. A/C System Performance - Ideal Vent Temperature
    Question:  I have a very simple question that I could not find an answer to: What should the air temperature be (at a duct output) when the A/C i...

  5. 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 simple answer is y...

  6. 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 Magazine. It...


  7. 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 ensu...

  8. 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 ...

  9. 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 s...

  10. 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...

  11. 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 ac...

  12. 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. Looking ...


  13. 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...

  14. 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...

  15. 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 a...

  16. 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...

  17. 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 wri...

  18. 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 compressors...

  19. 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 firs...

  20. 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 hand...

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