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HVAC control problems with 993

  • 1995
  • 911 Carrera
101 000
Heating and Ventilation

I am going crazy trying to solve an HVAC problem in my 993. The system worked perfectly until about a year ago, when the AC controls stopped working- when turned on, it would work for about 10 seconds, and then the fan would stop running. To make a (very) long story short, after considerable investigation my mechanic thought the problem was in the CCU, and we sent it to ECU Doctors in Florida for repair. I got the unit back, and after re-installing there was a different (and rather bizarre) problem - with the AC turned off the vents blew ice cold air, but no AC when turned on. We sent it back again, and they replaced the unit. It worked fine for a couple of weeks, but now the AC seems to work, but the heater only works (and much more weakly than before) when the recirculating button is on, not with external air flow, and hot air only comes out of the right side vents- the left blows cold air. There are no problems with the blowers at all when everything is off.  Any ideas?



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