Front Demister Problem - Constant Hot

[jboult]

All,

I wonder if anyone can help with a strange problem I'm having with the front windscreen demister. When the blower is on, the left side and the centre section blow air at the temperature selected on the dial, but the right side (in front of the driver) just blows constant hot air!

Does anyone have any idea what's causing this - and how to stop it?! With the weather warming up it will start to be an issue. Thanks.

Cheers/John

 

[paul kelley]

Hi

Check the valve from the heat exchanger( flap) if this is the same arrangement as on my 3.2 911 this could be the problem.

Hope this helps

Have fun

Paul Kelley

 

[jboult]

Paul,

Thanks for the quick response. If I knew where to look I might give it a go...! Do you have any advice about how to go about this, or can you point me at a resource somewhere? Thanks in advance.

Cheers/John

 

[paul kelley]

Hi John

The flap is high up behind the rear panel, can be accessed from under the car ,but only using a lift (unless you are very small!!)

Steve Winter at JAZ in Wembley sorted mine out, give him a call07002911911.

Good luck

Have fun

Paul Kelley

 

[Porker993]

On the 964/993 left and right hand cabin air is controlled independently by flaps in the area betwenn the front luggage compartment and the windscreen. I had the same problem years ago in my 964. Turned out my aircon had leaked oil all over the sensitive electronics leading to the symptoms you describe.

It's an easy DIY fix - all you need to do is take off the plastic cover next to the fuse box and look underneath. You will see the little black control boxes which can be removed and cleaned out. Sorry I can't be more specific - my memory is a little hazy as this was 8 or nine years ago now.

 

[jboult]

Thanks guys - Camtune just confirmed the same thing over the phone, as a known problem (they're always very helpful). Looks like I'll be getting my hands dirty. Again...

Cheers/John

 

[Johnny C]

Maybe the controller too, mine was doing the same; it would open the hot air flap but wouldn't close it again. New electronics solved it. I was told it's becoming a known problem with 993's, and 2nd hand units are becoming hard to get (and the OEM new ones are pricey)

 

[Porker993]

ORIGINAL: MoC2S

mixing servo

That's the little doohickey. I managed to open mine up on the 964 and clean it out - worth a try as I'm sure the replacement parts are not cheap.

 

[jboult]

Thanks all, I'll start taking a look this weekend. Am I right in assuming the servo is in the same place on the 993 as it is on the 964 (in the boot, under the plastic trim)?

Also, someone else has mentioned that there is a small electrical motor in the driver's footwell, just behind the panel where the boot release is. Apparently this sometimes sticks and can often be freed by tapping it. Can anyone confirm this or give any more details?

Cheers/John