A technician’s approach to HVAC diagnosis and testing


Twenty years ago, we could break down all areas of HVAC diagnostics into three categories when you really think about it. It was and still is called Heating, Ventilation, and Air Conditioning (HVAC). All of the HVAC parts and components did the same thing NO MATTER what vehicle they were installed on. A compressor pumps, the TXV valve meters, the heat-exchangers allow a change of state, etc.

Even if the car had Automatic Climate Control, we still needed to determine some basic operating characteristics before going deep into system diagnostics. I’ll spare the customer confirmation and validation of the problem speech for this writing. Let’s just say, something in the HVAC is broken and we know it’s broken! By the way, while we’re talking about validation of the customer’s concern, let’s get the ugly word “Intermittent” out of the way. I was taught a very long time ago by a GM instructor that there is NO SUCH THING as an Intermittent. We just haven’t duplicated the conditions necessary for the problem to replicate itself.  Read the entire story

Download the entire September/October 2017 Issue
Learn more about the Mobile Air Conditioning Society at our website at www.macsw.org

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About macsworldwide

Mobile Air Conditioning Society (MACS) Worldwide Founded in 1981, MACS is the leading non-profit trade association for the mobile air conditioning, heating and engine cooling system segment of the automotive aftermarket. Since 1991, MACS has assisted more than 600,000 technicians to comply with the 1990 U.S. EPA Clean Air Act requirements for certification in refrigerant recovery and recycling to protect the environment. The Mobile Air Conditioning Society (MACS) Worldwide’s mission is clear and focused--as the recognized global authority on mobile air conditioning and heat transfer industry issues. www.macsw.org
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