Re: Swooshing sound from AC when cornering - Saab 9000 Bulletin Board - Saabnet.com
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Re: Swooshing sound from AC when cornering
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Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Fri, 10 Jul 2015 06:31:04 Share Post by Email
In Reply to: Swooshing sound from AC when cornering, Mike Johnson, Fri, 10 Jul 2015 04:42:31
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Condensation from the evaporator isn't draining. It is especially noticeable when making turns to the right with the blower running. This will kill the blower motor if not corrected.

There are 3 drains. Two of them drain water that falls into the aquarium. These drains are rubber tubes that look like upside-down periscopes with trap doors. The periscope-shaped tube that matters the most is the one nearest the passenger side because the evaporator drain uses it. To check these drains you can remove the aquarium cover and pour a glass of water on top of the blower housing, and then see if water exits both drains. It probably will because these are big drains, at least 1" in diameter. The third drain is a tube that runs from the evaporator housing to the passenger side drain that looks like an upside-down periscope. Your problem probably is with the this tube because it is pinched at the end and prone to clogging.

Quasi recommends going after this from underneath the car. You can see pictures at the link below. I don't like this approach because reinstalling an external drain tube is a royal pain.

Here is my procedure. Good luck however you choose to tackle it.
DRAIN UNCLOGGING PROCEDURE
1. Park the front end on ramps to make this work more comfortable.
2. You can check a periscope-shaped tube by opening the trap door and inserting a finger to see if it is clogged. It probably isn't. Don't remove these tubes because they are a royal pain to install.
3. Remove the aquarium cover. If you see standing water at the bottom of the aquarium then the periscope-shaped drains are clogged. Jump to step 7. If the aquarium is dry then remove the false bulkhead. Clean whatever debris you see at the bottom of the aquarium by knocking it loose with a long screwdriver followed by vacuuming with a crevice tool.
4. Look down the gap located where the evaporator and blower housings meet. You'll see the round rubber top of the periscope-shaped tube that is closest to the passenger side, and you'll see the W-shaped end of the evaporator drain tube. Agitate this tube using the screwdriver inserted as best you can into the end of the tube, or perhaps use a pair of screwdrivers like chopsticks to squeeze the end of the tube. Water will flow out if it was blocked at the end.
5. If you want to verify that the two periscope-shaped tubes aren't obstructed then pour a glass of water on top of the blower housing and look under the car to confirm that water is dripping from both drains.
6. Take the car for a test drive with the A/C on making a lot of right turns. You should hear no unusual blower noises, and A/C condensation should drip from the drain that is closest to the passenger side.
7. Note that the rubber periscope-shaped drain tubes are robust. If you find an obstruction in one of these tubes then you probably can work it out by squeezing the tube and working from the top of the tube down to the trap door. If you remove a tube (not recommended), then you'll need to make the end of it very slippery (glycerine soap) and squeeze it hard to make it pop into the hole at the bottom of the aquarium. The tube that is closest to the passenger side is easier to install from above than from underneath if you have removed the false bulkhead so that you can see what you're doing.

Quasi's procedure


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