The thermo contact in the AC compressor can fail, which means the compressor may fail to engage or disengage.Google+
Car Problem Reports
Saab 9-3 AC Compressor Fails to Engage or Disengage
Saab 9-3 Problem
Average Mileage: 127,050 mi (74,000 mi - 203,305 mi)
Visitor, 2001 Saab 9-3, 203,305 mi
ac run but blows hot air
AC works more off hen on.
It didn't work x 1 year (only one evening it turned on over that time), then worked for 2 years, followed by another 1 1/2 years of not working and 2 months working again and currently not working.
These cycles occur without intervention (quote is around $1000 for new a/c, no other options provided for repair).
When the air conditioning fails, the air circulation is failing as well.
Visitor, 1999 Saab 9-3, 165,000 mi
ac comes on once in a while and blows cold but doesn't work often
When I turn on the airconditioning the motor comes on, but only blows warm air