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Author Topic: Only cold air to the back seat even if heater in HI position  (Read 5849 times)

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polilara

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Only cold air to the back seat even if heater in HI position
« on: 29 October 2016, 08:16:03 »
Hello

Remember this issue have been discussed here earlier but cannot find it. Only cold air is available from the nozzle located between backrests of front seat, strange. Other nozzles offer very hot air. Where to start, where is the mechanism? Please help.

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TheBoy

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Re: Only cold air to the back seat even if heater in HI position
« Reply #1 on: 29 October 2016, 10:23:42 »
I'd have to look at ducting again, but thought it half came from front drivers, and half from front passenger's, with no separate control/servo/etc

Are both sides at the front hot?
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #2 on: 29 October 2016, 12:58:46 »
Thanks, have to check that passenger side is hot also, I'll come back.

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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #3 on: 30 October 2016, 14:59:38 »
So, both left and right side in front (dashboard and windscreen) are hot, should check the floor tomorrow, too Is the nozzles in back connected to one of these three channels,(dashboard, windscreen and floor) or is the connection to back before anything?
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Doctor Gollum

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Re: Only cold air to the back seat even if heater in HI position
« Reply #4 on: 30 October 2016, 15:32:31 »
From the layout, it's either opposite the dash outlets or always open...

Set panel to dash/face and HI on both sides, then close all the FRONT vents and set the fan to max.

Anything at the rear vents?
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #5 on: 31 October 2016, 17:09:43 »
Good idea, thanks. I test this next time when driving...
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #6 on: 05 November 2016, 13:13:13 »
OK, done just like Doctor Gollum adviced. After set panel to dash/face realized that hot air coming from all dash nozzles. After having closed them all etc. I got terribly cold air from back seat nozzles. I do not understand...
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Zirfeld

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Re: Only cold air to the back seat even if heater in HI position
« Reply #7 on: 05 November 2016, 13:35:36 »
Hi polilara

Even it is for pre facelift models, maybe it is helful for you



I think pos. 14 "Luftverteilergehäuse" -> air distributing box

Rolf
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Doctor Gollum

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Re: Only cold air to the back seat even if heater in HI position
« Reply #8 on: 05 November 2016, 16:52:04 »
Blocked heater matrix then :y

See the guide... :y

Easier on left hand drives, as glovebox removal allows for much better access :y
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #9 on: 07 November 2016, 18:00:09 »
Thanks for all comment and tips. Just do not understand how the heater matrix can be blocked if there is hot air coming from everywhere else than the back seat nozzles. Want to ensure this idea before start to remove parts...
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #10 on: 10 November 2016, 17:46:17 »
Hello again

Do you really believe that the heater matrix could be blocked here, I do not understand the situation as the car is really warm even in -10 degrees Celsius. Only the blow to back seat is cold like it came outside. Any other ideas???
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Doctor Gollum

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Re: Only cold air to the back seat even if heater in HI position
« Reply #11 on: 10 November 2016, 18:59:14 »
Yes.

Rear vent supply comes from lower area of the matrix.  And crud in the system will sit in the bottom of the matrix. No coolant flow in that part of the matrix equals no heat in the rear.

You could try flushing the heater before replacing... :y
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biggriffin

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Re: Only cold air to the back seat even if heater in HI position
« Reply #12 on: 10 November 2016, 19:42:24 »
I wouldn't worry, as I dont sit in the back, :D
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #13 on: 13 November 2016, 17:11:45 »
Quote from: Doctor Gollum on 10 November 2016, 18:59:14
Yes.

Rear vent supply comes from lower area of the matrix.  And crud in the system will sit in the bottom of the matrix. No coolant flow in that part of the matrix equals no heat in the rear.

You could try flushing the heater before replacing... :y

Now I understand! Sorry Doctor Gollum, totally new info for me. It is very logical. Try to do something.

Regards to biggriffin as well, when coming back home from restaurant and my daughter drives I have to sit in the back... cold winter is coming to Finland.
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polilara

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Re: Only cold air to the back seat even if heater in HI position
« Reply #14 on: 26 November 2016, 09:35:01 »
Quote from: Doctor Gollum on 05 November 2016, 16:52:04
Blocked heater matrix then :y

See the guide... :y

Easier on left hand drives, as glovebox removal allows for much better access :y

So, I think I replace the matrix. In finland, yes, left hand drive, does anybody have illustration how to remove the old one. I have minor leak between cylinder block and head so I used several years chemicals preventing this leakage. Perhaps that blocked the lower part of the matrix. Any ideas for removing the old matrix are welcome...
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