Reply to "Need assistance ASAP"

roverltdMember

Sounds like a shop will be charging the system. If they are good they know how to eliminate the guess work in the amount of freon required.

Too much is as bad a too little when it comes to R-134. I assume the same for R-12.

Some shops start with a baseline charge for the system (like 3 pounds), then run it. They measure the cold air temp output. Add a little more and see the effect. If it drops, add a little more until it maxes out. If they add too much, the temps no longer drops. Might even increase. Trial and error, but gets it to the best setting for that specific system.

We learned this system for Big Rig Truck AC systems. Too many variables with hose length and general system condition. So a little fine tuning was always require to keep the drivers happy.

5/14/0810:03 PM

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