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Re: Does an R134a sightglass NOT tell you you're low? Posted by Gene N [Email] ![]() ![]() ![]() In Reply to: Does an R134a sightglass NOT tell you you're low?, Bill Homer ![]() |
For R134a systems, you have to go by the pressures you read as it relates to ambient temperature. If you are charging a R134a system that has been evacuated, then you do the charge based on refrigerant weight. If you are adding refrigerant to a system that is low, you look at the pressures. (Although, you should really try to find the source of the leak.)
I've never had a converted system, but it my understanding that if you charge a converted R134a system until the bubbles are gone, you've overcharged the system. I noticed that the sight glass generally disappeared from cars after the auto makers switched over R134a, so there may be some truth to that.
I know that my one car with R134a has no sight glass, and the three cars that have R12 do have a sight glass.
posted by 155.104.23...
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