Date: Mon, 31 Jul 2000 01:03:54 GMT From: "William Brooks" <sea.brooksnopsamdnet.att.net> Subject: Re: 1988 9K ACC runs too warm
FWIW The problem turned out to be a servo motor for the air mix flap that had been installed incorrectly. The independent Saab mechanic that did the original replacement of the motor checked it and found that the motor had gotten messed up either through misinstallation or manufacturing defect. Apparently, the motors Saab uses in this application are programmable (I don't know, I've never heard of this before) for rotation direction and travel. If a motor is powered up without it being properly installed, it initializes itself incorrectly. Since he knew he had done the original replacement, he offered to eat the labor if I bought a new motor. That seemed fair, since there was at least a possibility the motor had gone whacko on its own. Ever since, it's worked just fine. Bill ----- Original Message ----- From: Christian B. Stegeman To: sea.brooksnopsamdnet.att.net Sent: Thursday, January 06, 2000 3:22 AM Subject: 9k ACC system Oh yes, I've experienced this one before on my 88 9kt. It's on the hot mode now, wait until it switches to all AC, which I experienced with my wife and kids coming back from Florida while in subfreezing weather crossing Tenn. Mine acted up periodically from about 1991 until it went out altogether hot in August, 1998. Your problem is probably the servo fan which operates the door that mixes hot and cold air into the cabin. The 9k's heat is always on, or rather the heater core is always hot. The temperature is brought down by varying the opening of the duct from the outside, and/or ac'd air. You can temporarily get around the problem by pulling the glove compartment, then remove the circlip holding the servo arm onto the vent rod. The servo is in the middle of the dash, about the height of the ACC control module (which BTW, if you pop your radio, reach into the hole, you can pop out the ACC module and while you can probably disconnect the servo from this opening, you won't be able to see what it looks like, and if this is your first time in, you need to see.) My dash has been sitting out for over a year, for after adjusting my AC for a month or so like that, the unit went out totally. I'm guessing the servo part costs in the neighborhood of $200. If you find some other reason, please post it, also. On Mon, 3 Jan 2000 14:21:23 -0800, "William Brooks" <sea.brooksnopsamdnet.att.net> wrote: >Happy New Year, All! > >I have a 1988 9000T that has a problem with the ACC. After driving for about an hour or so, the cabin starts to get uncomfortably warm. It seems to do this regardless of ambient temperature. > >I'll set the ACC to say 68 deg. F and it will adjust vent and heating and cooling as appropriate. After about an hour, the air starts getting warmer until it gets to the point where I have to adjust the temperature setting to "Lo" to get some cooler air in the cabin. This happens regardless of whether the ACC is in Auto or Econ mode. The a/c itself works fine and is able to cool the car quite well, even when it's 100+ outside. It's just the control unit, I think. > >If I stop and turn off the car and then start it again, operation returns to normal for another hour or so. > >Anybody run into this before? Sounds like a tough (read, expensive) troubleshoot. Just wondering if anybody has had this happen to them and what was required to solve the problem. > >Many thanks.
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