A/C work, Evap box

derkpitt · derkpitt's Garage

When I removed the Evaporator and box, I found all the seals gone.
To Fix this I made a seal out of the loop side of 2" Velcro for the pass side inlet. Putting it around the outer edge of the triangular duct. And for the round driver's side I used a 3/8" wide high density rubber. Placed in the cup of the duct. To get the box in better contact with the duct, I made a coupler out of a plastic jar. Using the lid to secure the jar to the box. Which was cut to length, to meet the rubber seal. Now the only air flowing past the evap will be only coming from the cabin.

Joeaksa · 06:01 AM

Derk,

VERY NICE POST! Now, how does it work? Mike Miller is working on something like this right now and lots of us are looking into how to improve things in this area.

http://forums.pelicanparts.com/porsche-911-technical-forum/88698-winter-c-poject-post639532.html#post639532

Pls keep us posted on how it works and if you made any improvements that help the airflow in the A/C system.

Joe

BGCarrera32 · 12-29-2002, 08:12 PM

Thanks for the post. Porsche sells a service kit with these seals but its like $25 or something ridiculous. I made new seals for the same inlet area and the air splitter pipe mounted above the smugs box with some 1/16" thick adhesive backed foam found at a craft store.

I also sprayed the blower fan motor out with Lectra-Motive electrical cleaner and tried to relube the bearings while I have it apart. Spins like a top now.

Maybe I am missing something, but doesn't it seem a little inefficient design wise to have the air intake down behind the passenger side floorboard, underneath the carpet? Not to mention sucking air right by your passenger's smelly sneakers...

-BG

derkpitt · derkpitt's Garage

I don't like the low density type foam rubber. That's what was in their to start. And it failed. I've seen the low density used a lot. It's quick to fill gaps, but it doesn't keep it's shape or last long. I try to find high density foam rubber for replacement. It takes more time making it fit just right. But it will last and seal much better than the original stuff.

derkpitt · derkpitt's Garage

To increase the flow of air to the inlet under the passenger floor board, I though of try something different. Looking at the pass side floor, the carpet completely covers the area. After removing it and relaying the floor mat back down their was an opening across the top of the floor board. I made a copy of the floor board out of .050 aluminum. And trimmed the top edge half an inch. This increased the opening at the top. The floor mat that I have completely covers the floor area. So you don't even notice the carpet is missing.

Elombard · 01-01-2003, 05:05 PM

Very Slick, that should really help air flow.

Next you could swiss cheese the aluminum and the mat and glue a piece of material the same color as the carpet on the aluminum. You would barely notice the holes in the carpet and get even more air flow.

We should caluculate the flow in the hole making some assumptions on the fan and find out if it is a restriction, regardless it still needs to pull cool air in from the passenger compartment.

I am still reeling from our last phone conversation. I bet we find that my compressor has caused "black death" in my whole system and I will need to replace all of the condensors!!! Can the condensors be cleaned if the "black death" is upon them?

Hey one other thing, do you know where I can get my oil cooler ultrasonically cleaned?

stormcrow · stormcrow's Garage

EW,

If the compressor is bad, you can flush the lines out, but you need the equipment to do it. Nitrogen blown through the lines will get the moisture out and will remove the conatminated oil.

When you install the new compressor, you need to replace the filter/dryer which will remove any condensables or particulate matter. Contaminated oil in the system would be a major cause for concern, but that shouldn't be a problem to take care of.

Steve

"A Porsche does more then just go fast in a straight line.

Elombard · 01-01-2003, 06:44 PM

Thanks Steve. I saw your other post. I cannot believe you are commuting from Norcross to Fayetteville - hard core.

I will bring lunch to the AC day!!

derkpitt · derkpitt's Garage

Erik,
Don't have any place in mind just now that can do the cooler cleaning. Let me ck around.

88911coupe · 06-02-2003, 10:27 AM

This is the pic I have been looking for. If you followed the round hole on the right in the pic above where would it open up into the cabin? I "think" it's possibly connected to the center console but there are also some small holes I noticed just to the right of where the foot rests on the accelerator.

derkpitt · derkpitt's Garage

That hole or duct goes to the front of the tunnel. Just to the right of the gas petal. It's pretty wide open under there after you get past the carpet and floor board.
If your having flow problems, have you ck'd the flex duct at the outlet of the evap blower? They crack a lot.

ruf-porsche · ruf-porsche's Garage

Quote:

Originally posted by stormcrow
EW,

If the compressor is bad, you can flush the lines out, but you need the equipment to do it. Nitrogen blown through the lines will get the moisture out and will remove the conatminated oil.

When you install the new compressor, you need to replace the filter/dryer which will remove any condensables or particulate matter. Contaminated oil in the system would be a major cause for concern, but that shouldn't be a problem to take care of.

Steve

"A Porsche does more then just go fast in a straight line.

Here a website on when a compressor goes bad.

http://www.ackits.com/index.cfm?fuseaction=Black%20Death

88911coupe · 09-02-2005, 02:33 PM

Just a point of clarification...there appear to be two round vents INTO the car but only 1 round port on the black plastic box, other than the triangularly shaped one. Does the exit from the black plastic box split to the two vents?
TIA

88911coupe · 07-15-2015, 07:03 AM

Can anyone confirm if there are any connections in the "return" air tube on the right (not the triangular one with the resistor, I've fixed that one) that can degrade or come loose? Or is it all sheet metal? I assume there are some breakdown spots in the upper system that takes they chilled air into the cabin. I just need to pull the cover off and see if there's anything obviously loose.