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Component/Part Fit

Compressors 101

May 2, 2022

You are invited to attend a compressors 101 class I will be conducting next week at the MACS training facility in Lansdale, PA.  The title of the class is Behavioral Characteristics of Various Compressor Types.  It is happening live on Wednesday May 11 from 5:30 to 9:00pm
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Tools and Diagnostic Equipment for Mobile A/C Service

April 29, 2022

Remember it is up to the individual service company or technician to ensure they are following the requirements established in the location where they are working.
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The benefits of MAP-controlled thermostats

February 9, 2022

A customer driving a 2014 BMW 328i arrived at the college's 2nd-year electrical lab reporting his illuminated check engine light. The customer had no complaints other than the light. The vehicle had just over 82K miles showing on the odometer. A student (Phil) assigned to the BMW performed a review with a scan tool, and a single code (P0597 – Thermostat Heater Control Circuit Open) was present.
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Air contamination in an A/C system can ruin your day

February 2, 2022

I had a memorable encounter with air contamination in the mid 1990s.  I was conducting a lot of retrofit clinics at the time and had recently acquired a demo refrigerant identifier which I took to those clinics. At one clinic, there was a technician who was extremely interested in the refrigerant identifier.  
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The pulse width modulated duty cycle signal

December 7, 2021

Several years ago, when vehicles using these compressors were just starting to show up at shops for service with some regularity, we were searching to find some detailed information about their behavior to use in clinics.  There was not a lot of it available, so we borrowed several vehicles and did some videos.  The following are some clinic slides produced from one of those videos.
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Exploring electronically controlled variable displacement compressors

November 23, 2021

Electronically controlled variable displacement compressors (ECVDs) have been in use now for over 15 years.  However, there are a lot of technicians in the field who have very little knowledge about them and their operation.
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Disassembly and inspection of a seized compressor

November 15, 2021

MACS Tim Iezzi takes apart a problem compressor in this step-by-step video.
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What do you know about the fixed displacement piston compressor?

November 2, 2021

What do you know about the fixed displacement piston compressor? 
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Bring the heat!

November 1, 2021

At this time of year, I often end up with an earworm in my head from a Canadian rock band … Summer’s going fast, the nights are growing colder. Then it’s the line everyone knows from something more mainstream … Winter is coming. It’s early September, and the leaves on some trees are already starting to change. Winter is coming.
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Mind the compressor clutch gap

August 31, 2021

One of the first things I was taught in my A/C training was to always check the clutch air gap prior to installing a compressor. 
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