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relative Humidity question

bll230 on Sat June 27, 2015 4:09 PM User is offline

Question for a AC expert. I have recently moved from Georgia at 90% humidity or so, to Las Vegas, at 0% humidity. We have 3 cars, 96 Integra, 03 C class MB, and new Subaru, all of which I have the service manuals for.

The AC chapter for all three cars specifies that the gauge readings should be done with the humidity between 30-80%. What do AC shops do out here in the desert to determine the proper pressures? Do I use the 30% humidity value and not worry about it, or do I extrapolate the values to 0% humidity?

On the east coast touching the return line and looking at the condensation on it was a bit of a backup confirmation that my pressures were correct. Here in Vegas there is no condensation and consequently the return line doesn't feel as cold.

Thanks

John

GM Tech on Sat June 27, 2015 6:50 PM User is offline

They measure refrigerant charge by weight and put in the underhood specified amount..

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

bll230 on Sat June 27, 2015 7:42 PM User is offline

I figured that is what they do for an initial fill, but what about servicing an existing fill?

Thanks

John

GM Tech on Sat June 27, 2015 11:01 PM User is offline

we reclaim all that is in the system then evacuate, then re-fill to underhood spec. Anyone who specializes in a/c has a recovery/refill machine--otherwise you are dealing with unexperienced a/c mechanics.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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