Check the evaporator temp sensor -- if it's bad, it can cause the
compressor to run when it should be off, and in certain circumstances
(outside air temp under 90 F, for instance) cause the evaporator to
freeze up.
Could be a bad expansion valve too, but the evaporator temp sensor
should still shut the compressor off before the evaporator freezes.
Peter
On Apr 26, 2009, at 9:37 PM, Allan Streib wrote:
Turned on the air conditioning this afternoon, for the first time.
Was
a little stuffy, 82 degrees inside...
Tonight I notice that the thermostat is showing 79 with the set temp
being 77. Air at the registers is cool but flow seems awfully low.
I went down to check the furnace and there is frost showing where the
liquid line (the insulated line) comes in.
Sigh. Always something.
Allan
--
1983 300D
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