Hot air through vents all the time......normal?
Thread Starter
Rennlist Member
Joined: Nov 2012
Posts: 615
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From: NJ
Hot air through vents all the time......normal?
I bought my car back in January and found out on the ride home that both my mixing servos are completely shot. I loosened the arms on the servos and opened the heat flaps all the way manually, and re-tightened the arms on the dead servos. This worked great during the cold months and I had plenty of heat.
As soon as the weather got warm, I did the exact opposite and slammed the heat flaps shut. This also worked great until the last few days which have been really hot. I have hot air coming through my vents even with the vents closed.
I've only had the car for a short time and I'm wondering if this is a normal condition.
All my other servos are working properly.
As soon as the weather got warm, I did the exact opposite and slammed the heat flaps shut. This also worked great until the last few days which have been really hot. I have hot air coming through my vents even with the vents closed.
I've only had the car for a short time and I'm wondering if this is a normal condition.
All my other servos are working properly.
Racer
Joined: Jan 2013
Posts: 449
Likes: 3
It's not normal but my car does the same thing. I haven't tried to address it yet.
Its pretty awful having to drive EVERYWHERE with the sunroof and Windows down. Literally the second I roll the Windows up the heat becomes unbearable
Its pretty awful having to drive EVERYWHERE with the sunroof and Windows down. Literally the second I roll the Windows up the heat becomes unbearable
IHI KING!
Rennlist Member
Rennlist Member
Joined: Aug 2001
Posts: 13,400
Likes: 230
From: Nashua, New Hampshire, USA
Stuck servos is not normal. ToreB has a great diagnostics page that can help sort the issues out.
http://www.porschehvac.bergvill.com/
http://www.porschehvac.bergvill.com/
Instructor
Joined: Sep 2012
Posts: 223
Likes: 0
From: ND, USA
Stuck servos is not normal. ToreB has a great diagnostics page that can help sort the issues out.
http://www.porschehvac.bergvill.com/
http://www.porschehvac.bergvill.com/
Thread Starter
Rennlist Member
Joined: Nov 2012
Posts: 615
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From: NJ
I'm aware of Tore's site, that's how I figured out that both my mixing servos are bad, as I've already stated. Currently both of heat flaps up front are shut and I'm still getting a lot of hot air coming through. I'm suspecting that the issue is somewhere in the back of the car. Anyone?
IHI KING!
Rennlist Member
Rennlist Member
Joined: Aug 2001
Posts: 13,400
Likes: 230
From: Nashua, New Hampshire, USA
Are you sure the heat is coming from the heater vents and not the footwell? I have had this happen and the cause was a torn heater tube. My hose was torn on the back and was not visible. A small leak will allow a large amount of heat into the cabin.
Torn heater hose threads
https://rennlist.com/forums/964-foru...t=heater+tubes
https://rennlist.com/forums/964-foru...t=heater+tubes
Torn heater hose threads
https://rennlist.com/forums/964-foru...t=heater+tubes
https://rennlist.com/forums/964-foru...t=heater+tubes
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From: Oslo, Norway
Thanks for the comments on my site guys.
My 993 mixer flaps have a foam seal around the flap itself to stop any air leaks when shut. The seal was gone on one of my flaps, leaking hot air to the vents.
This could be the case in 964's too? I haven't had a detailed look on the actual flaps in a 964 so I am not sure.
II've seen some of the hose problems too. This mostly cooks down to a torn hose or loose clamp in one of the footwells, behind the carpet walls.
Cheers,
Tore
My 993 mixer flaps have a foam seal around the flap itself to stop any air leaks when shut. The seal was gone on one of my flaps, leaking hot air to the vents.
This could be the case in 964's too? I haven't had a detailed look on the actual flaps in a 964 so I am not sure.
II've seen some of the hose problems too. This mostly cooks down to a torn hose or loose clamp in one of the footwells, behind the carpet walls.
Cheers,
Tore