LagondaNet Forum Index LagondaNet

 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

warm air flap

 
Post new topic   Reply to topic    LagondaNet Forum Index -> Technical
View previous topic :: View next topic  
Author Message
peacorp



Joined: 26 Jun 2010
Posts: 18
Location: UK

PostPosted: Mon Jan 04, 2016 9:12 pm    Post subject: warm air flap Reply with quote

Hi Guy's,

I hope you can help.

I have 13085, but its cold inside due to a small fault.

The heating is blowing cold all the time. The system blows hot air to the screen if set to demist but only cold air from the car vents regardless of any settings except off.

So I think it is a stuck flap.

If it is a stuck flap which one would it be, and where would I find it.

If it's not a stuck flap what could it be?.

I have no idea how this system works, so I'm guessing.
I have read all the forum entries on the air con / heating.

Any help would be gratefully received.

Thanks

Dave.
Back to top
View user's profile Send private message Visit poster's website
david



Joined: 21 Mar 2008
Posts: 118
Location: Nottingham

PostPosted: Mon Jan 04, 2016 9:34 pm    Post subject: Reply with quote

Look under "Lagonda Restorations", vin 13277 and the posts by Jonathan Clark, it is maybe 2/3 the way down page six.

Otherwise, without any more information, or seeing the car, it could be almost anything but vacuum leaks and/or split vacuum pipes in the engine bay and behind the dash are favourites.

The vast majority of the system is located behind the dash, so a fair degree of dismantling may be required.

David
Back to top
View user's profile Send private message
peacorp



Joined: 26 Jun 2010
Posts: 18
Location: UK

PostPosted: Mon Jan 04, 2016 10:36 pm    Post subject: Reply with quote

[quote="david

The vast majority of the system is located behind the dash, so a fair degree of dismantling may be required.

David[/quote]

Thanks David, you can guess that's just what I didn't want to hear, but I had a feeling that would be the case.

Dave.
Back to top
View user's profile Send private message Visit poster's website
david



Joined: 21 Mar 2008
Posts: 118
Location: Nottingham

PostPosted: Tue Jan 05, 2016 7:06 am    Post subject: Reply with quote

The heater matrix sits on a shelf above the air con evaporator - it is quite a rudimentary air blend system.

The demist vents are located in a top rail above the heater matrix so when you are selecting defrost, an electric solenoid is energised (or de-energised, I forget which) and a vacuum signal is sent to the demist vent flaps and they open accordingly.

If this is happening, it implies that some of the vacuum circuit at least, i.e. from the engine bay into the car, is intact.

It would seem then that the problem is more likely behind the dashboard than in the engine bay and it could be a fault with the programmer or the supplies/signals to and from it - this is located behind the instrument pack and connects to the blend flap by means of a bell crank linkage.

Normally this system fails to heat so you may just be one of the lucky few and find the linkage is seized, but it will still require instrument panel and the left binnacle housing removal to access it.

David
Back to top
View user's profile Send private message
Vincent



Joined: 20 Nov 2007
Posts: 1055
Location: Belgium

PostPosted: Wed Jan 06, 2016 8:48 pm    Post subject: Reply with quote

I would suggest to first check the heating valve on the right side of the engine. We have replaced this part on 4 cars with success...
_________________
Welcome to Paradise ! (FRONT 242)
https://www.youtube.com/watch?v=XS30BC3D5WM
Back to top
View user's profile Send private message Visit poster's website
peacorp



Joined: 26 Jun 2010
Posts: 18
Location: UK

PostPosted: Thu Jan 07, 2016 4:47 am    Post subject: Reply with quote

Thanks Guy's.

I'll have a look at your suggestions.

Dave
Back to top
View user's profile Send private message Visit poster's website
jonc



Joined: 21 Sep 2010
Posts: 584
Location: Cheshire, UK

PostPosted: Thu Jan 07, 2016 9:48 am    Post subject: Reply with quote

Vincent wrote:
I would suggest to first check the heating valve on the right side of the engine. We have replaced this part on 4 cars with success...


Hot air when in demist mode suggests this valve is OK.

In Demist (or Bi-level I think) mode, the vacuum to the hot water valve is cut enabling hot water. This suggests the Programmer is not operating, despite a good vacuum supply. The rest position for the Programmer is full-cold which would enable vacuum to the water valve and so keep the heater matrix cold.

This suggests the Programmer is either at fault, or its the sensor string input is permanently grounded.
Back to top
View user's profile Send private message Visit poster's website
peacorp



Joined: 26 Jun 2010
Posts: 18
Location: UK

PostPosted: Sun Apr 17, 2016 2:28 pm    Post subject: 1 or One Reply with quote

This has been a long time coming, but I have 1 question.

The pipe that comes from 1 on the programmer goes to the water valve, where is the water valve?.

I sent the car away to be fixed and it came back worse. It's my own fault I never let people play with my car but I've been a bit busy so I thought 'just this once'.......well never again!. It came back with hissing comming from the dash and nothing working correctly at all except the fan speed. So I went in to the dash and found 3 pipes disconected 2 of which I have figured out, which leaves the 1 in question.

Thanks for any pointers

Dave.
Back to top
View user's profile Send private message Visit poster's website
david



Joined: 21 Mar 2008
Posts: 118
Location: Nottingham

PostPosted: Sun Apr 17, 2016 7:15 pm    Post subject: Reply with quote

Hi,

Port one on the programmer does go to the water valve.

This valve is located in the engine bay at the rear of the right side of the engine bay.

If it is an original fitment valve it will be attached to the chassis leg just in front of where the chassis leg meets the bulkhead, more or less below the wiper motor.

if you still have problems, maybe give me a call.

David
Back to top
View user's profile Send private message
peacorp



Joined: 26 Jun 2010
Posts: 18
Location: UK

PostPosted: Mon Apr 18, 2016 8:52 am    Post subject: Reply with quote

Thanks,

I'll have a look.

Dave.
Back to top
View user's profile Send private message Visit poster's website
Vincent



Joined: 20 Nov 2007
Posts: 1055
Location: Belgium

PostPosted: Wed Apr 20, 2016 6:18 pm    Post subject: Reply with quote

david wrote:
Hi,

Port one on the programmer does go to the water valve.

This valve is located in the engine bay at the rear of the right side of the engine bay.

If it is an original fitment valve it will be attached to the chassis leg just in front of where the chassis leg meets the bulkhead, more or less below the wiper motor.

if you still have problems, maybe give me a call.

David


What I said above...
_________________
Welcome to Paradise ! (FRONT 242)
https://www.youtube.com/watch?v=XS30BC3D5WM
Back to top
View user's profile Send private message Visit poster's website
peacorp



Joined: 26 Jun 2010
Posts: 18
Location: UK

PostPosted: Sat Apr 30, 2016 1:01 pm    Post subject: Programmer Reply with quote

I have completed the repair so I thought I would report back with the conclusion. It turned out that the programmer was faulty I have replaced it with a second hand unit from the states which only required one hole to be drilled in the flap connecting arm.

The hot water valve is as described here, thanks chaps. That pipe was broken in 3 places so probably hasn't been working for some time.

I have also replaced a few other vacuum hoses as they had either broken or looked like they might soon.

The dash board is a fiddle to get out but not as difficult as I expected and I replaced one of the speedo 7 segment LED's that had lost one segment. I bought all of the stock that an Italian stockist had so I have spares if anyone needs them.

Thanks for every ones help.

Dave.
Back to top
View user's profile Send private message Visit poster's website
RRV363



Joined: 17 May 2016
Posts: 29
Location: Detroit, Michigan, USA

PostPosted: Fri May 20, 2016 4:55 pm    Post subject: Reply with quote

I have the same issue. This is of great help. Thanks.
_________________
13372
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    LagondaNet Forum Index -> Technical All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum




Powered by phpBB © 2001, 2005 phpBB Group
Custom Software