QUOTE(McMark @ Oct 4 2010, 08:48 PM)
Red lever has nothing to do with the fresh air blower.
yep, I get that.
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I looked at the air flow system again to refresh myself. Here's the important points:
1. The dash vents are a 'branch' off the defrost vents. So anytime you're on 'defrost' you're also blowing out the side vents. This is something I had never considered. You'll get better windshield defrosting if you shut the side vents closed with the little lever.
my car doesn't have a little lever, it has a wheel under the vent outlet, but it definitely operates as you describe.
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2. The fresh air location lever (middle) and the hot air location lever (bottom, red) both work the same way. All the way to the left directs the air out the bottom. All the way to the right directs air out the defrost vent (see #1).
Yep -- on my car, this red lever does nothing to effect hot air flow direction. I checked and the cable is connected to the front-trunk flapper and seems to be moving the articulating arm.
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3. Pressing the floor lever down is supposed to shut off hot air completely. Moving the top dash lever all the way left is supposed to shut off fresh air completely.
these both work as described in my car.
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4. If you're getting unequal flow between the left and right vents, you need to check the hoses and boxes for obstructions. You also need to confirm that your flapper boxes are opening fully at the exhaust system. And that your fresh air box valves are opening correctly (pull the paper tubes and look inside).
At this point i'm suspecting the tubes because the flappers seem to be working. I will pull it apart over the long weekend and investigate.
Mark -- is there any advantage to the OE tubing other than that it's OE? I'd prefer to use the more flexible, durable, and cheaper nylon tubing.