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Evaporator icing-- how to fix? 200 1992

posted by  jkordzi on  Mon Sep 13 03:46 CST 2004
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last visit: Wed Sep 12 02:43 CST 2001
[RELATED]

My 93 245 does the same thing. Although this wasn't my problem, check your clutch cycling switch on the accumulator, by attaching a gauge to the low pressure side. Check the FAQ for the exact pressure (low 20s, I've forgotten exact pressure) at which the clutch should shut off. If too low, then the evaporator could freeze up. My 93 doesn't have an adjustable switch, but your 92 should, since it came with R12. You could try adjusting the switch to have the clutch shut off at a slightly higher pressure, but the trade off is less cooling.

The other possibility is that the system doesn't have the correct charge. The R134a systems are much more sensitive to this and the only way to really know the correct charge is to evacuate the system and refill by weight. That's why the newer 134a cars only have a low side - so gauges are not used for determining the correct charge.

BTW, did you install an adjustable VOV when you switched over?

If this isn't the problem and you find out what is, pls post it.






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