dr bob

I'm thinking that a filter could be fabbed from pleated media, formed into a cone or flat-sided funnel shape, flanged at the big end so it would seal at the opening where the blower boot fits up. Thoughts or has anybody tried this before?

Mine is my DD, so I need to get project stuff lined up before I get into it, or I end up with 'Deja Du' (where I seem to do everything twice.)

ROG100

I have looked at the fitting of the pollen filter but gave up short term. My conern was reduction of flow versus additional air cleaning.
I have a complete HVAC from a 94 GTS and one day when my dash is ready to be fitted will make the upgrade.

ROG100

On another note.
Over the last 8 years of ownership my GTS has provided awesome AC. Very very cold as soon as the key is turned. 30F in Texas 110F.
About 6 weeks ago the clutch on the compressor went **** up. Along with this terminal act the AC had been blowing hot and cold and frankly was not doing the job as I had become used to.

We had the compressor rebuilt and after Sean installed it the cold air was back but the quality of air temperature was still up and down.

Sean picked the car up on Monday and proceeded to R&R my HVAC vacuum system. All diaphragms were bad in one way or another. All replaced with a lot of moaning and groaning about the f***** defroster actuator.

WOW & WOW - the volume of air is amazing to the end that I can't wear a toupee in the car any more.
ICE Cold air on all settings.

Sean you are a marvel and thanks for fixing my AC.

Deantec

[QUOTE=dr bob;7827635]I'm thinking that a filter could be fabbed from pleated media, formed into a cone or flat-sided funnel shape, flanged at the big end so it would seal at the opening where the blower boot fits up. Thoughts or has anybody tried this before?

How about a Lady's stocking as a filter stretched over the end of the blower boot
Dean

VehiGAZ

What if you get a run?

ROG100

Seamed or un-seamed 8>)

Jadz928

Fishnets. Yum!

Does anyone know max CFM of the blower?

byrdman454

Does anyone have the dimensions of the opening on non-pollen cars where the blower boot sits?

Donald

That wasn't so bad, thanks for the guilt and info Sean (and they should be seamed, Roger). I suppose that under the SOP of WYIT I should dig into the airbox as well?

While we are on TMA, FYI I used what I had in the garage, and "Scrubbing Bubbles" worked great on the evaporator coil. Just swapped the spray button w/ a CRC can so I could use a nozzle tube (Bubbles is an innie, but like Rog most of my sprays are outies- TMIIK). Also taped a 3' section of soft foam pipe insulator to the shop vac hose and ran it in there w/o fear of damaging the fins.

Jim M.

I just finished cleaning and vacuuming mine. I couldn't believe how much dust, gunk and junk was in there. When I first removed the boot I thought I was in the wrong area, I couldn't see any of the fins of the evaporator. I used an old tooth brush then a paint brush to clean the fins. Tomorrow I'll pick up a can of the foam cleaner and do it all again.

Sean, I owe you for this one, great tip. Probably needs to be done on a yearly basis.

blandis

Sean,

Did mine yesterday while I was at Brads. Was pretty nasty. Still dont have cold AC up front... is a bit better now that its clean. Used a tooth brush and some scrubbing bubbles and the hose.

Wedged the recir flap closed. Next step is to to check all the vaccum, may get to it this weekend. Getting outside air from somewhere.

WallyP

"Closed" on the recirculation door is usually taken to mean the default condition, for outside air.
"Open" to the inside of the car will usually give colder air after the car is cooled below ambient temp.

byrdman454

I just got finished cleaning mine again. I then started looking around for a cheap and easy way of adding a "poor man's" pollen filter for older 928s. I threw this together and it seems to work (so far). I will keep an eye on it to see how long it lasts, or if it needs something more permanent.

Pic #1 The vent filters are a pack of 12 for $4 at Home Depot.
Pic #2 It is a little too long, so it needs to be cut a little shorter.
Pic #3 The height of the filter is the same as the duct opening. The length needs to be long enough to wrap around the outside of the duct on each side. It is held in place with 2 long zip ties zipped together.
Pic #4 Fan installed
Pic #5 Boot installed. The boot will also help keep the filter in place.

If this doesnt work, I found a K&N filter from a scooter that might work with a little cutting down, but to try it will cost me $50. I thought I would try the cheap way first. I was also concerned with the oil of the K&N making more of a mess on the evaporator coils just like it does with the MAF hot wire.

Jadz928

^^^^^^^
Interesting approach... there is high CFM at the blower scroll discharge. It is the narrowest x-section. Be careful not to inhibit flow by using a filter rated for lower CFM. Also keep in mind the efficiency loss as the filter captures particulate.

dr bob

I was thinking kind of along those lines, but I think you could take a few of those and make them into a tapered-end box, and pass the tapered end into the air duct. More surface area, less pressure drop across the media. I was also going to hunt down something pleated, with a finer HEPA-like filter capability. Hopefully the extra area of the tapered structure and the pleats would offset the finer filter openings.