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The pulse width modulated duty cycle signal

2021年12月7日

几年前, 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

2021年11月23日

Electronically controlled variable displacement compressors (ECVDs) have been in use now for over 15 years.  然而, 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

2021年11月15日

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?

2021年的11月2日

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

2021年11月1日

每年的这个时候, 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 … 冬天即将来临. It’s early September, and the leaves on some trees are already starting to change. 冬天即将来临.
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Mind the compressor clutch gap

2021年8月31日

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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What type of condenser is in that vehicle?

2021年8月17日

What type of condenser is in that vehicle? It's a frequent question in the mobile A/C industry.
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Field study: Incorrectly installed condensers

2021年8月10日,

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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找到正面朝上

2021年8月3日

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.  然而, none of these characteristics apply to the condenser the technician had installed. 
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Low refrigerant charge and the search for real data

2021年6月22日

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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