AC Center Vent
07-19-2012, 05:39 PM
#4
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Well, if you pull the louvers out of the vent, and open the lever, you should have a pretty good view of the comb flap. Once the car is started, and the A/C is on, the flap should lift up. If it doesn't, there's a good chance that's because the diaphragm for its vacuum actuator is torn.
To access the actuator, the center console needs to come out. This is more work on earlier airbag cars due mainly to a nearly inaccessible bolt on the right side the console (next to the PS airbag housing).
Once the CC is out, the actuator can be accessed - it's right on the front of the HVAC box. However, to replace it, you need to disconnect and reconnect a lever within the box. The lever will pop off the actuator arm just fine with a twist, but you need to be able to reach it to reconnect the actuator arm once the new diaphragm or actuator is installed. The lever is accessible through the PS side air duct, but the hole for this duct is not accessible without removing the dash on an airbag car. The alternative is to use a hole saw and cut a hole in the front of the air box to allow access to the lever, and then plug that hole once the job is done.
Roger sells replacement silicone actuator diaphragms for about $50. An OE actuator is more like $90, and still has the more fragile rubber in it.
To access the actuator, the center console needs to come out. This is more work on earlier airbag cars due mainly to a nearly inaccessible bolt on the right side the console (next to the PS airbag housing).
Once the CC is out, the actuator can be accessed - it's right on the front of the HVAC box. However, to replace it, you need to disconnect and reconnect a lever within the box. The lever will pop off the actuator arm just fine with a twist, but you need to be able to reach it to reconnect the actuator arm once the new diaphragm or actuator is installed. The lever is accessible through the PS side air duct, but the hole for this duct is not accessible without removing the dash on an airbag car. The alternative is to use a hole saw and cut a hole in the front of the air box to allow access to the lever, and then plug that hole once the job is done.
Roger sells replacement silicone actuator diaphragms for about $50. An OE actuator is more like $90, and still has the more fragile rubber in it.
07-19-2012, 10:03 PM
#6
Rennlist Member
Do you mean no air is coming out of the lower half, or no cold air? If no cold air, that is normal for a 928, unfortunately. I posted this issue recently and got some good replies on how to modify the center vent so that the top vent louvers can blow air left and right, since little cold air comes out of the lower half.
You should definately fix your comb flap if it's not opening, that will greatly increase air flow and cooling.
You should definately fix your comb flap if it's not opening, that will greatly increase air flow and cooling.
Last edited by Don Carter; 07-19-2012 at 10:04 PM. Reason: typo
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08-12-2012, 03:37 PM
#8
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You can use duct tape to tape the comb flap open. You need to remove the cover with the louvers and put the adjusted lever on the right side in the middle so you can clearly see the comb flap. If you prop it open and hold it open with your fingers (relatively easy) you can use duct tap to tape it to the top of the vent opening. This significantly improves air flow for the A/C. If you have any warm air coming out of the bottom half of the duct opening (this is from the heater core you can see at the bottom of the opening) your heater valve is leaking. If you can't get the leak to stop (they often leak a little) you can put duct tape over the lower half (only) right above the heater core. This keeps the upper half (AC) fully open with no comb flap blocking airflow. Toghether these duct tape mods should improve your AC performance.
08-20-2013, 03:26 PM
#10
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
