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Originally Posted by brewtoo
This is interesting. I never would have thought a low charge could cause different-temperature air to flow from the different vents.
The air flows through the evaporator and then out the vents. How does the low charge make the vent temps vary?
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I wish I knew the definitive answer to this question. Note that the 210 has dual-zone climate-control, so the left side of the evaporator feeds the left side vents (and the left side of the center vent).
The temperature difference between the two center vents is dramatic when the system is about 6 or 8 oz low. 40F right, 65F left.
I do have a suspicion, though. It's possible that the refridgerant is completely evaporating in the right side of the evaporator when the charge is a bit low. Note that the low-side pressure is regulated by the compressor.
It's also possible that when there is no liquid going to the left side of the evaporator, there is nothing to help carry oil out of it. I suspect that it both get no liquid to evaporate, and holds too much oil in the process.