Engine Size: 2.0
Refrigerant Type: Freon
My '99 Jetta with 90k miles had ice cold a/c until last week. Now it blow cool for a while, then cold again, then next use cool again. I'm going to add Freon to see if that's what's needed. My question is: does Freon dissolve or deplete over time, or do I absolutely have a leak somewhere?
my thought too, perfect thanks.
Since it gets cold once, you have enough refrigerant. There aren't gremlins under the hood taking it out and putting it back. In other words, intermittent cooling is not caused by lack of refrigerant. So don't add any.
Most VWs have a SD7V16 compressor, which is a variable displacement unit. A common problem with that compressor is the variable displacement will get stuck at a low displacement when it should be high, then you have little or no cooling.
Freon is a DuPont trademark for R-12, your vehicle uses R-134a so if like using tradenames have to call it Suva.
Variable displacement compressors like the old POA valves are very difficult to charge via pressures. Lots of other variables besides ambient temperature and humidity. Only recommended way is to use a charging station, it extracts the refrigerant and measures it, either add or subtract to that level so it meets the vehicle's recommended capacity.
Poor cooling is always blamed on low free-on, can be electrical problems, drive problems, and even filthy evaporators or condensers. You risk overcharging the system where it can blow its cork.
Little difficult to think about AC since it was 12 degrees below zero this morning here.
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