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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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Who are MACS future leaders?

August 27, 2021

Nominations are now open for the 2022 MACS board of directors’ election. Are you ready to get involved and help shape MACS for the future?
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Two clues to a condenser’s identity

August 24, 2021

There are two steps to determining what type of condenser is in a vehicle.
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What type of condenser is in that vehicle?

August 17, 2021

What type of condenser is in that vehicle? It's a frequent question in the mobile A/C industry.
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Mysterious servicing issue in R-1234yf systems

August 11, 2021

Recently a 2017 R-1234yf Honda system, with 72,099 miles, encountering a loss of cooling (slow leak) over time would not pass the equipment charge procedure and the production amount could not be charged. 
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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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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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Come to Orlando for MACS 2021 Training Event

July 21, 2021

Pete Meier of Motor Age explains the value of attending MACS 2021 Training Event and Trade Show!
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Top three tips on orifice tube behavior

July 20, 2021

In the last four MACS blog articles we covered a lot of detailed information about orifice tube system behavior. We examined a system with a full refrigerant charge verses a 25% undercharge. Now it is time to condense it all down into three important takeaways.
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Low refrigerant charge and the search for real data part 4

July 13, 2021

When we examined the pressure readings and vent temperature readings last week, there was nothing showing up that indicated any charge issues (even operating with the 25% undercharge).
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