Skip to main content

Compressor

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
Read 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 >

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 >

Variable output scroll compressors

January 5, 2022

This compressor has been around for quite some time and the vehicles it is used on are getting some age on them.  However, they still show up in shops with regularity and there still seem to be a lot of technicians that are not aware of the problem, diagnostic procedure and cure. 
Read Article >

When you don’t know about clutch wires

December 27, 2021

The conversation involved a clutchless compressor unit. A CSR who had sold one to a shop contacted me and said his customer (who was both the shop owner and technician working on the car) had just called him. There was a concern that the compressor didn't have a clutch wire.
Read Article >

An overview of electronic variable displacement compressors

December 21, 2021

we have focused on electronically controlled variable displacement compressor operation and behavior.  It is important to have a good understanding of how these compressors operate and behave. This is because the percentage of vehicles coming into shops using these units is growing and will continue to grow.
Read Article >

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 >

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 >