SOLVED : air recirculate not working. 20 word or less DIY
 

I am pleased to report - I have solved my old problem - the air recirculate button not making the flaps close on the blower motor.

The original post is here :

http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/932196-air-recirculate-not-working-2-minute-diy.html

This post might

Today I finally got around to this. I took Porsche part 944 572 709 00 - vacuum line, with rubber moulding on one end, and threaded it down to the open vacuum port from the firewall. I will try to find my pics of this. Since the vacuum line was rigid plastic, I could use moderate force and work the end into the open rubber hose port. I used a touch of dielectric grease to lube the vacuum line. I used a some long needle nose pliers I had that were curved on the ends - perhaps you know what those look like - and used them to help counter the force applied to the line so it worked into the port.

Started car, pressed recirc button, immediately noticed different air flow. Under the hood, verified the blower motor vacuum actuators were pulled all the way in.

As a bonus, I crafted some charcoal matrix add-on filters using bulk filter from the internet and hot glue, cut flanges from the matrix itself, and they passively sit on the blower input. Hoping not to get sand and odors blown in the cabin now.

Nice work!

two views of the scene :

http://forums.pelicanparts.com/uploa...1566396137.jpg

http://forums.pelicanparts.com/uploa...1566396266.jpg

small update :

on cold settings, with the fan running at any setting, the recirculate button makes the system sound like more air is being blown.

on hot settings, with the fan running at any setting, the recirculate button seems not to make a difference.

.... perhaps that is by design... I'll try to look under the hood when I get a chance...

Hi Bukowski. Cool pix and interesting post.... I am a new 944 Turbo owner (1986). And when I am driving, it always feels like the heat is on inside the car. No matter what I do with the controls it feels hot (switches, recirc, fan, AC, sliders). Did you run into any issues like that? Do you think your fix might have an impact on my situation?

Thanks!

Hey Keepy1970, for the constant heat issue, first check under the driver-side dash and look for a couple brass rods routed next to the center console. The "toothed" sections of the rods should sit in white cradles at the end of the levers. Normally, there should be a metal clip that holds the rod to the lever, otherwise the rods can pop out.

I'd get new white pieces and clips, and then replace them down there. Here's a write-up on Clark's Garage that goes over this, and even includes part numbers:

http://clarks-garage.com/pdf-manual/hvac-01.pdf.

If you're still getting constant heat, you probably have an issue with the A/C system itself, whether it's low on refrigerant or has a bad compressor and so forth. If your snowflake switch doesn't stay depressed when you push it, you'll have to resolder in a new button. I made a tutorial for that here:

https://imgur.com/gallery/kuAgmpt