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Re: Questions 1 Saabers Like This Post!
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Posted by pme [Email] (#1496) [Profile/Gallery] (more from pme) on Sun, 18 Aug 2024 12:20:31 Share Post by Email
In Reply to: Re: Questions, Lawrence Stevens, Sun, 18 Aug 2024 10:15:11
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A few observations that may be helpful.

The servo motors that drive the blend doors work as follows. On the passenger side there are three motors - one way at the top of the air box that drives the recirculation flap (hardest to see looking up), one that is more midway down the air box (controls passenger side/rear temperature blend) and finally a lowest one that controls the air duct routing via a rod. On the drivers side there is one motor, which handles the driver side temp blend.

The temperature control “flaps” are actually drums that rotate to direct the air across the heater core depending on temperature requirement, there are two that sit side-by-side and rotate independently.

The motors themselves are attached to gear boxes that actually drive the shafts that turn the drums. The resistence of the gears and motor can make it difficult to rotate them by hand in situ.

Assuming that as Mike Johnson suggests the AC is actually chilling the pipes so you have cold air available, absent a Tech 2 to read any stored codes, you could try some testing as follows to narrow down your issue(s).

With the engine running, start by turning the blower speed all the way up, and press the “recirc” button; listen for the characteristic roar as the recirc flap open and starts drawing air from inside the cabin. If that works, that motor and flap is working.

Next try to shift the air path. Push the defrost button, then dash, then floor vents, paying attention each time to whether the air flow changes appropriately. That should rule that motor/flap in or out.

Finally, select the dash vents, then change the temperature to HI. See if both the passenger/rear and drivers sides are blowing the same temperature. Then change the temp to LO and see what they are doing. If there is a temperature difference between the sides that will let you know which side is acting up.

There are a few good resources illustrating how to make sure the gear on the motors is engaging the gear box (search posts by dmz789zz on this board), and for how to access, remove and repair the blend and distribution door motor see the link below. Platanoff has some great step-by-step with photos that you can follow - note that the repair parts he had made are now easily available from eEuroparts, so no home engineering required .

Good luck

~pme

Platanoff Saab




->Posting last edited on Sun, 18 Aug 2024 16:52:03.

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