Air Conditioning Cycling On/Off Issue

[dkjones96]

Baseline for a 134a system is generally 20 degrees colder out the vents then ambient(either outside air or recirculated air) while normally driving. r12 is generally 25-30 degrees colder and a hydrocarbon system like I used to run in my Toyota can be close to 40 degrees colder.

On an 90 degree day I could have 35 degree air out the vents no problem in-town, the expansion valve usually regulated the system so it didn't freeze over but it happened occasionally. But, hydrocarbon refrigerants(while more efficient and safer for the environment) are illegal for use in automobiles in the United States.