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Testing an electronically controlled variable displacement compressor
December 14, 2021
The A/C system was run with the vehicle's computer controlling the compressor. When the heat loads were changed, there were noticeable changes in the duty cycle signal being supplied to the compressor.Read Article >
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.Read Article >
Diagnosing electronically controlled compressors
November 30, 2021
When preparing to conduct diagnostics on a system using an electronically controlled variable displacement compressor, the diagnostic process needs to focus on four areas.Read Article >
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.Read Article >
Electronically controlled variable displacement compressors
November 16, 2021
what if" this system used an electronically controlled variable displacement compressor instead of the pressure controlled variable displacement compressor? What would the results be?Read Article >
Disassembly and inspection of a seized compressor
November 15, 2021
MACS Tim Iezzi takes apart a problem compressor in this step-by-step video.Read Article >
Troubleshooting the “what ifs” in a mobile A/C repair
November 9, 2021
High side: Likely somewhere around 130 psi (at an idle) & 140 psi at 1500 rpm. Why? With only a 35% charge in the system, the compressor isn't going to be producing a lot of pressure.Read Article >
What do you know about the fixed displacement piston compressor?
November 2, 2021
What do you know about the fixed displacement piston compressor?Read Article >
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.Read Article >
Tesla aftermarket repair information
October 29, 2021
NASTF has released new information on industry changing news! After 4 years of working together with Tesla, NASTF is pleased to announce that Tesla scan tool and service information is now available to the aftermarket. For the American and Canadian markets (Canadian version is in the final testing stages) things are changing rapidly that's why the National Automotive Service Task Force (NASTF) has brought their best experts to explain how to find, set-up, and implement this new information so you can add this new service opportunity to your shop.Read Article >