Staying RRR current
October 25, 2022
The refrigerant checked out fine. No contamination with other refrigerants and no air contamination. Their machine pulled 30 ounces out of that system.Read Article >
The ambient temperature differences
October 11, 2022
That hose is easy to get to, so I whipped it off of there and had the new one on probably in less than 3 minutes. The owner was standing there watching and thought I was finished when I tightened up the second connection. He said he was going to go up and pay and would be back to get the car and hit the road.Read Article >
Do you know about the B1479 trouble code?
August 3, 2022
If you work on Toyota, Lexus and Scion A/C systems, chances are that you have encountered a B1479 diagnostic trouble code on a system that will not operate.Read Article >
It’s still not blowing cold enough
July 6, 2022
This customer came in with this car (he provided the vehicle information) and said it isn't blowing cold enough and wants me to make it blow colder. He just recently bought it and this is the first “hot spell” we’ve had since he’s had it.Read Article >
Air contamination in mobile A/C systems
January 18, 2022
We covered a base line test conducted with 0% air contamination and provided pressure and temperature information. This week we will provide pressure and temperature information experienced with 7.7% air contamination and 18.9% air contamination.Read Article >
Helping your customer understand their A/C repair
December 16, 2021
To help service shop owners, MACS has created a 30-page consumer guide for your customers that explains how their car’s engine cooling system and air conditioning system works. “Getting to know your car’s air conditioning and engine cooling system,” details how these vital climate systems work and why they may require an extensive repair.Read Article >
You can get Tesla repair information
November 10, 2021
Find out how to use Tesla software for aftermarket repairRead Article >
Troubleshooting the “what ifs” in a mobile A/C repair
November 9, 2021
High side: Likely somewhere around 130 psi (at an idle) & 140 psi at 1500 rpm. Why? With only a 35% charge in the system, the compressor isn't going to be producing a lot of pressure.Read Article >
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.Read Article >
Understanding and troubleshooting data lines on heavy-duty trucks
September 23, 2021
Understanding and Troubleshooting data lines on heavy-duty trucks will be presented byLarry Turay of LETCO Enterprises. In Larry’s Saturday morning class, attendees will learn how components and subsystem inputs and outputs can influence HVAC operations.Read Article >
Cooling fan circuit analytics
September 16, 2021
What is Peter Orlando’s class Cooling Fan Circuit Analytics about? It all began decades ago as a mechanical fan attached to the water pump with and without a fan clutch. And now it has evolved into an efficient complex electrical motor control of cooling the modern internal combustion engine.Read Article >
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.Read Article >
