Strange climate control activity - suggestions?

[Randy McCall <randym@schiller.com>]

Listers,

Coming to work this morning in light rain my climate control head (1990 
200Q) started flashing the outside air temp LED, and I could hear a relay 
cycling under the left side dash at about 1 hz.  The climate control was 
set to ECON at the time, so no compressor action.  When I set the CC head 
to auto (compressor functioned ok) the relay stopped cycling as did the 
flashing LED.  Any suggestions as to this particular problem and/or 
remedies?

TIA

Randy
'90 200Q