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A burned clutch is a symptom of another problem

September 14, 2021

Not much thought is given to compressor clutches until they fail, but they are extremely durable.  I have personally owned three vehicles that had between 200, 000 and 240,000 miles on them.  They all still had the original compressors and clutches, and they were still functioning perfectly.
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The Humble Mechanic wants to see you at MACS

September 2, 2021

Charles Sanville, better known as the Humble Mechanic is MACS Keynote Speaker. Come see Charles on Thursday, September 30 at 11:30am at The Rosen Centre Hotel in Orlando, FL.
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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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MACS Tesla project

August 26, 2021

MACS is working on a project, to collect A/C charge information for Tesla vehicles, and we need your help!
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Field study: Incorrectly installed condensers

August 10, 2021

I have handled numerous tech calls involving older GM trucks with incorrectly installed condensers.  In preparation for this series of MACS blogs, I discovered a salvage truck with one of these condenser repairs.  This gave me the opportunity to duplicate the incorrect installation and look for pitfalls and solutions.
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Finding right side up

August 3, 2021

Most condensers have different fittings on the inlet and outlet.  The locations of the inlet and outlet on most condensers will not allow lines to be connected incorrectly, even if the fittings do happen to be the same size.  Lastly, the designs of the mounts on most condensers prevent a unit from being installed upside down.  However, none of these characteristics apply to the condenser the technician had installed. 
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Did you install the condenser upside down and backwards?

July 27, 2021

The vehicle was a 1998 Chevrolet C 1500 truck with a 5.7 engine. The issue was excessive high side pressure. Almost as soon as the compressor clutch engaged, the high side pressure was over 400 PSI, and the high-pressure cut-off was turning the compressor on and off.
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Low refrigerant charge and the search for real data part 3

July 6, 2021

To place as much heat load on the system as possible, we turned the heat in the shop up on high and got it as hot as possible before beginning the test. When the temperature peaked at 89°, we began the test. We tried to keep it constant, but all the heat being generated by the engine in the test vehicle caused it to inch upward by 2.5° before the second test was concluded.
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What’s the word on R-134a price & supply?

June 24, 2021

The email questions are already coming in, and they go kind of how you’d expect: What’s going on with the price of R-134a? Is there going to be a shortage of R-134a supply?
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Low refrigerant charge and the search for real data

June 22, 2021

I had read about how low refrigerant charges could increase compressor operating temperatures and decrease the amount of oil flowing to compressors, but I had never been able to find results from any tests. After discussing this with MACS, we decided to do some testing to get some real data.
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