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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Fri Jul 27, 2018 1:47 pm    Post subject: Differing air temperatures between the vents Reply with quote

Hi all,

With the soaring temps recently this might be an apt question.

My car is a non-AC car so the air coming out of the vents is far from cool anyway. But I am convinced the air coming out of the centre 2 dash vents and possibly the passenger side vents is distinctly warmer than every other vent.

Is this possible?

Additionally I find the glovebox gets very hot. You certainly wouldn’t want to transport a drink in there unless it was a cup of coffee ☕️

Thanks!
 
  
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KP964
Watkins Glen


Joined: 20 Feb 2012
Posts: 2239
Location: Northumberland


PostPosted: Fri Jul 27, 2018 2:15 pm    Post subject: Reply with quote

Not noticed that with the air temp , ill check it out , could certainly do with a good drinks holder that wont spill and wont ruin the dash etc
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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Fri Jul 27, 2018 2:50 pm    Post subject: Reply with quote

Are you also non-AC?
Do you not have a really hot glovebox?
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5342
Location: Brighton


PostPosted: Fri Jul 27, 2018 7:44 pm    Post subject: Reply with quote

Im not sure if this is something you want to fix yourself but if so heres a link to some info ..

https://drive.google.com/file/d/1iMW3gU7UBBITZRwMpdyIr5zXxNpj0qce/view?usp=sharing

It does sound off hand like a heater motor is not operateing correctly .. i would start with a tester for any fault codes then move onto drive links to see whats working .
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KP964
Watkins Glen


Joined: 20 Feb 2012
Posts: 2239
Location: Northumberland


PostPosted: Fri Jul 27, 2018 7:45 pm    Post subject: Reply with quote

MaKSiNG wrote:
Are you also non-AC?
Do you not have a really hot glovebox?


Coolish glove box ... no AC
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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Sat Jul 28, 2018 10:41 pm    Post subject: Reply with quote

I think I read something about the HVAC system before. Isn’t it really complex with lots of little relays and such?
Maybe one of the relays is stuck. Is that what you mean?

deMort wrote:
Im not sure if this is something you want to fix yourself but if so heres a link to some info ..

https://drive.google.com/file/d/1iMW3gU7UBBITZRwMpdyIr5zXxNpj0qce/view?usp=sharing

It does sound off hand like a heater motor is not operateing correctly .. i would start with a tester for any fault codes then move onto drive links to see whats working .
 
  
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MarkGolf
Montreal


Joined: 13 Nov 2012
Posts: 538
Location: S.London


PostPosted: Tue Jul 31, 2018 12:24 pm    Post subject: Reply with quote

The HVAC systems on these are a nightmare.

It sounds like a servo of yours is jammed if some are cool yet some are hot, the hot air from the engine is getting around and let in to the car through the jammed vent, if you undo the plastic scuttle cover which is in front of the wiper when the bonnet is up, play with the positions and see if you can see the servos move and change position..

Tore Bergvil came to the rescue of mine, my HVAC unit died along with a thermister? in one of the vents.
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MarkGolf
Montreal


Joined: 13 Nov 2012
Posts: 538
Location: S.London


PostPosted: Tue Jul 31, 2018 12:28 pm    Post subject: Reply with quote

See here,

https://www.bergvillfx.com/porschehvac2
_________________
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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Fri Aug 17, 2018 9:45 pm    Post subject: Reply with quote

Just completed a 3 hour motorway drive and boy is it hot in my car. Especially with 30 degree temperatures outside.

Basically the whole bulkhead, the metal part beneath all the wiring under the dash, gets really hot to touch. You really feel the radiating heat on your legs and I presume it heats all of the dash from the back, hence the hot glovebox.

It really must be a stuck servo or vent or some such. The exhaust heat must just be heating up that area constantly.
Annoyingly the recirculating button on my CCU has now also broken and is stuck on permanently, maybe it’s related too.

What were they thinking with this over engineered HVAC unit PC
 
  
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treefrog99
Newbie


Joined: 19 Apr 2013
Posts: 33
Location: Derbyshire


PostPosted: Sat Aug 18, 2018 9:05 pm    Post subject: Reply with quote

Have you checked the heater hose that runs from the sill to the heater on that side of the car. Mine had a small split in it and allowed the hot air from the heat exchanger to be fed into the car. On mine the hot air even made the radio to hot to touch. There are also flaps either side of the car, they usually rattle when you shut the door, that open and close depending on the heater position. These can stick I believe, I think there is a thread on here about refurbishing them.
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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Sat Aug 18, 2018 10:12 pm    Post subject: Reply with quote

treefrog99 wrote:
Have you checked the heater hose that runs from the sill to the heater on that side of the car. Mine had a small split in it and allowed the hot air from the heat exchanger to be fed into the car. On mine the hot air even made the radio to hot to touch. There are also flaps either side of the car, they usually rattle when you shut the door, that open and close depending on the heater position. These can stick I believe, I think there is a thread on here about refurbishing them.


This sounds like it could be my exact problem!!! Thank you!!!
So peel the carpet back in the footwell and I should see the hose on the outer wall near the sill?
And what about the flaps? Are these attached to the end of the hose? They rattle? Never noticed this.
I’ll take a look see what is under the carpet in the footwell.
Don’t suppose you have a link to the refurbishing of these 🙄

Many thanks!
 
  
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treefrog99
Newbie


Joined: 19 Apr 2013
Posts: 33
Location: Derbyshire


PostPosted: Sun Aug 19, 2018 4:15 pm    Post subject: Reply with quote

Yes the pipe runs behind the carpet.
The flapper valve is quote"The differential flapper valve is installed into the junction of the ducting system between the heat exchanger outlet and the pipes that lead off the left and right mixing chambers" Adrian Streather.
The article on how to refurbish/check I cannot remeber where I read it either on here or in the PCGB mag.
This may help and you may be able to contact the author.

on 911.co.uk The Redbaron thread page 31 about half way down.

Trev
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2003 Audi a4 tdi quatro
1987 golf gti

Failure is simply the opportunity to begin again, this time more intelligently.
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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Sun Aug 19, 2018 8:13 pm    Post subject: Reply with quote

treefrog99 wrote:
Yes the pipe runs behind the carpet.
The flapper valve is quote"The differential flapper valve is installed into the junction of the ducting system between the heat exchanger outlet and the pipes that lead off the left and right mixing chambers" Adrian Streather.
The article on how to refurbish/check I cannot remeber where I read it either on here or in the PCGB mag.
This may help and you may be able to contact the author.

on 911.co.uk The Redbaron thread page 31 about half way down.

Trev


Cheers Trev. You are a legend.
Nice easy job then ... NOT!!!
 
  
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MaKSiNG
Silverstone


Joined: 03 Jul 2005
Posts: 123
Location: East Germany


PostPosted: Wed Aug 22, 2018 2:58 pm    Post subject: Reply with quote

Interesting enough, I have had a clicking noise coming from the footwell for sometime and I now convinced this could be this heating flap opening and closing sporadically.

Must investigate further.
 
  
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