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A new refrigerant for Trucks?
May 4, 2022
EPA has listed HFO-1234yf under the Significant New Alternatives Policy Program for Motor Vehicle Air Conditioning in Non-road Vehicles and Servicing Fittings for Small Refrigerant CansRead Article >
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.Read Article >
MACS 2023 Annual Training Event and Trade Show
April 7, 2022
MACS 2023 Annual Training Event is back on schedule for 2023! We will meet at the Gaylord Opryland Resort in Nashville, TN. February 2-4, 2023.Read Article >
No drier replacement, no compressor warranty!
April 6, 2022
Compressor manufacturers and parts distributors are adamant about driers being replaced when one of their compressors are installed. No drier replacement, no compressor warranty!Read Article >
Refrigerant supply, pricing and safety
March 8, 2022
What I'm hearing about refrigerant supply and pricing this year reminds me of a similar period in the mid-2000s. It was springtime, just before the start of A/C season. Supplies of R-134a were tight and the price had come close to tripling from the prior year.Read Article >
Sometimes it is user error
February 8, 2022
I encountered a situation in the early days of recovery/recycling machines when they had just been introduced. I had set up a machine about four months earlier when the customer purchased it. I went to great lengths to cover proper operation of the unit and the shop owner even attended a certification clinic I conducted.Read Article >
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.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 >
