IML: 71 auto temp II

[Bruce Stubblefield <audiblefeast@xxxxxxxxx>]

Hello,
     The mighty 71 4-door is in the shop for AC
repair, and I have a question.   The symptoms are: 
for the entire year I've had the car, the auto temp
has had two settings, very hot and very cold. 
Thumbwheel to 65 degrees makes very cold,  thumbwheel
at 85 makes very hot.  Recently the heat vs defrost
routing has not worked (air out of defrost on both
heat and defrost, etc. ) The shop seems good and the
guy doing the car  seems experienced, but they have
had it for 3 days and haven't found all the problems. 
They say all the vacuume lines held and were ok, and
that my problems are electrical(freon is full,
compressor good).   They found the amplifier bad, from
overheating, which  they say is common with this
system(which resembles Mercedes systems, apparently
they copied it, or something).  Amplifier was
replaced, along with its one-amp fuse.  As of now,  AC
blows at 43 degrees WHEN IT WORKS.   It's
intermittant.   He has been able to get the AC to work
by starting on defrost for a while, then switching to
AC.   He also says that the relay which keeps the
heater off until the coolant is hot also keeps the AC
off until the coolant is hot(meaning, he says it's
designed that way), which makes no sense to me and
contradicts the FSM.  
    Any comments?

Many thanks
Bruce S
      


		
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