Date: Wed, 23 Dec 1998 20:48:09 GMT From: (cs) Subject: Re: 93 9000CSE Climate Control Problems Don't trust dealer
This problem you're experiencing is likely the servo motor that alternates between hot and cold, to maintain the air temperature on the 9000. I had the same problem on my 88 9kt. The 9000's climate control system is designed such that there is always hot air, to which is added as needed cold air via a flap that opens and closes by the servo motor. Another servo opens and closes the outside air intake to assist in adjusting for humidity. Couple of points: You don't need to go to the dealer for diagnostic readings with an ISAT; just hold the vent and auto buttons down together for about 5 seconds, then the system goes into a diagnostic mode. If there are no faults, you'll have a "0" show on the display, and if faults, the number thereof will show. Use the fan speed buttons to cycle through them. Not being in my garage as I write this where my service manuals are, I'll go from memory: you will probably have a "5C" code show up, which is for reverse polarity on the servo. Another could be "5U" the u being for undetermined. If you are sure your ac compressor is working, to nail it down to the servo, pull you glove box (assuming a LH drive car), and just behind the ACC control box (which BTW pushes in and out like the Clarion stereo), and on the ride hand side is the servo in question, with a rod clipped to it. Remove the clip, so that you can manually open and close the flap, and pushing it in, as I recall, will be full AC air. I seem to recall reading something about this on the SAABNET site. Look there as well. On 21 Dec 1998 00:46:30 GMT, FEDavisnopsamdnet.att.net (Fred E. Davis) wrote: >On Sun, 20 Dec 1998 22:03:23 GMT, Conrad B Nelson ><cnelsonnopsam4500-a.ewndsr1.nj.home.com> wrote: > >> Help! >> >>I have a 93 9000CSE with 102K that has been misdiagnosed at the dealer >>multiple times for multiple problems. Currently the Climate control is >>stuck on heat. It's behaving like the air is being sucked through the >>heat exchange unit no matter what the setting. If I turn the unit off >>hot air comes through the vents instead of just outside air. If I turn >>the system to low the fan goes to full the compressor kicks in but the >>air still comes out hot. I took it to the dealer who said it was the >>ECM and the repair would cost 1500.00 I told them to put the car back >>together as is and I'd get the repair done elsewhere(this only cost >>300.00). Low and behold the system worked correctly for the next two >>months. The system has started acting up again. Has anyone seen this >>happen or could you point me to some trouble shooting material for the >>climate contrl system. > >Did the dealer download the diagnostic codes with the ISAT? If it >indicates no problem with either its own circuitry or any of the >sensors, it could be a problem in the wiring harness, or even the ACC >itself (I don't trust a defective unit to correctly diagnose itself). >The dealer won't/can't repair the unit, only replace it. > >The ACC receives input from several sensors: > > 1) outside temperature comes from the trip computer (EDU), using > the outside sensor behind the front bumper > > 2) mixed air temperature (inside air ducts) > > 3) interior cabin air temperature (on the dash) > > 4) sun sensor (on top of dash) > >A full description of the ACC and service (including all of the fault >codes) is in manual "8:3 Automatic Climate Control ACC 2" which I >don't have.
 |
 |
 |
 |
 |
