Billygtr

Apologies if these are such basic and/or mundane questions that viewing them may expose the reader to the risk of sudden somnolence or loss of eyelid control, but I have been unable to find answers on the web or on these forums.

What is the range of low-side and high-side operating pressures for R134 in a system that is operating properly and charged for optimum cooling? I realize these vary with ambient temp and condenser air flow...

On said optimally charged system, what is the maximum possible temp differential (*F) between an AC thermometer placed in the center vent and ambient temp with the cabin airflow recirculating and the fan speed on the lowest setting?

Related issue: I have adapted my R22 gauges to connect with R134 fittings and flushed fresh R134 through the lines. Any additional issues I should be aware of?

Thanks.

mack1

Hi Billygtr and welcome

I've attached a chart that came with a guage I purchased a couple of years ago. It might help. Looks like there are differences in max/min pressures depending on the vehicle manufacturer and expansion method.

On using the R22 gauge set with R134, a friend of mine did that and said that it ruined his gauges. I have an R22 set that I haven't used on R134 because of that. It might be that his gauges were about to die any, since you were able to buy adapters.

I don't know the range of temps in the cabin vents. If your unit is low on freon, you might slowly put some in and monitor a vent gauge and watch for the peak. There is an optimum amount and if you get too much, the expansion unit will freeze up and the unit kick out on high pressure. Too little, of course, you get less cooling that you would like.

Have a nice day,
Mack1

Attached Images

ACdata.jpg (179.6 KB, 9 views)

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