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R-1234yf

The desiccant myth

April 12, 2022

There is a myth that exists involving A/C service work and driers that seems to come up from time to time.  I have encountered it when handling tech calls and have seen it come up in A/C forums. Read more to find out what it is.
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What does a MACS Section 609 card look like?

March 10, 2022

MACS occasionally receives reports from the field of a technician being refused purchase of refrigerant for not having a proper Section 609 card. Usually this is due to the technician not producing the right card or the counterperson not understanding what a MACS Section 609 card looks like. What does a MACS Section 609 card look like?
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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.
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Checking for refrigerant contamination

February 24, 2022

A large percentage of MACS members have refrigerant identifiers and use of them on vehicles that come into their shop for A/C service prior to beginning any service work is standard procedure. However, there are a lot of non-MACS member shops who do not have identifiers and unfortunately are not aware of the potential issues which can be caused by refrigerant contamination.
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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.  
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The effects of air contamination in an A/C system

January 11, 2022

If you perform an Internet search for effects of air contaminated refrigerant on automotive A/C system pressures, you’ll find many results.  This information leaves no doubt that air contamination of refrigerant in an automotive A/C system can affect system pressures and temperatures
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The concept of superheat

October 19, 2021

We illustrated the concept of superheat in last week's article by boiling water and superheating steam in a moonshine still. This week we will apply this concept to refrigerant in an air conditioning system.  The still has been replaced with an evaporator. 
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Behavioral characteristics of various compressor types pt. 2

October 5, 2021

So now it is time to provide the correct answer along with information on why it is correct and also information on why the others are incorrect.
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AEM Update: Snap application for off-highway R-1234yf

September 22, 2021

MACS will have a variety of heavy-duty and off-road presenters beginning at 8 am on Thursday, September 30.  One will be AEM Update: Snap application for Off-highway R-1234yf
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Behavioral characteristics of various compressor types

September 21, 2021

When faced with a challenging A/C system problem, knowing what type of compressor you are dealing with can help streamline the diagnosis process. 
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