Topic: Only cold air to the back seat even if heater in HI position (Read 4734 times)

polilara · « **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.

TheBoy · « **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?

polilara · « **Reply #2 on:** 29 October 2016, 12:58:46 »

Thanks, have to check that passenger side is hot also, I'll come back.

polilara · « **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?

Doctor Gollum · « **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?

polilara · « **Reply #5 on:** 31 October 2016, 17:09:43 »

Good idea, thanks. I test this next time when driving...

polilara · « **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...

Zirfeld · « **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

Doctor Gollum · « **Reply #8 on:** 05 November 2016, 16:52:04 »

Blocked heater matrix then

See the guide...

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

polilara · « **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...

polilara · « **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???

Doctor Gollum · « **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...

biggriffin · « **Reply #12 on:** 10 November 2016, 19:42:24 »

I wouldn't worry, as I dont sit in the back,

polilara · « **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...

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.

polilara · « **Reply #14 on:** 26 November 2016, 09:35:01 »

Quote from: Doctor Gollum on 05 November 2016, 16:52:04

Blocked heater matrix then

See the guide...

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

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...

Doctor Gollum · « **Reply #15 on:** 26 November 2016, 16:46:24 »

Read the guide in the Maintenance section, then remove in order...
1. Glovebox complete.
2. Trim panel from beneath Glovebox, where footwell vents exit.
3. Vent ducting from under Glovebox, one clip and pull out.
4. Undo centre console from tunnel and slide back to rear seat.
5. Undo support bar across end of matrix.
6. Undo plumbing connection inside footwell and remove matrix as per guide.
7. Refit in reverse etc...

Job jobbed

polilara · « **Reply #16 on:** 26 November 2016, 22:19:40 »

Thanks Doctor Gollum, I do my best and report soon, winter coming, here in Finland might be -20 degrees in winter time so blocked heater matrix is not very welcome...

STEMO · « **Reply #17 on:** 28 November 2016, 15:04:45 »

If you've been putting 'chemicals' in the coolant to seal a leak, I'm sure you'll find lots of sludge everywhere you look.

polilara · « **Reply #18 on:** 01 December 2016, 15:51:08 »

Yes, I found it (sludge) also from the plastic "pressure tank" whatever you call it and changed it, too. Changing matrix seemed to be quite big job according to good guide found here. I try to flush the matrix first as in that plastic tank the sludge was not very tight. I changed the tank only as I broke mechanically the float system during cleaning it...

Perhaps I have to change cylinder head gaskets when next time changing timing belt. Leaking coolant from back corner in oil filter side. Then perhaps stem rubbers in the same time, I guess that worn rubbers is the reason that this engine is a real morning smoker (236 000 km behind).

polilara · « **Reply #19 on:** 05 December 2016, 18:02:37 »

Tried to flush, no help. have to do this:

http://www.omegaowners.com/forum/index.php?topic=90621.0

Guide is good but case seems quite "difficult" so how doable this really is. How much time needed what spares should be available O-rings etc. Is one weekend enough for this?

Any comments from you that made this are welcome, steering wheel is in left side here in Finland, understood easier than when the steering wheel in located in right side.

Doctor Gollum · « **Reply #20 on:** 05 December 2016, 19:20:06 »

At risk of repeating myself...

Quote from: Doctor Gollum on 26 November 2016, 16:46:24

Read the guide in the Maintenance section, then remove in order...
1. Glovebox complete.
2. Trim panel from beneath Glovebox, where footwell vents exit.
3. Vent ducting from under Glovebox, one clip and pull out.
4. Undo centre console from tunnel and slide back to rear seat.
5. Undo support bar across end of matrix.
6. Undo plumbing connection inside footwell and remove matrix as per guide.
7. Refit in reverse etc...

Job jobbed

You shouldn't need to cut/remove/butcher much... Start with the above list making sure that the centre console is out of the way. Only cut what you need to, having first peeled back the covering if you must cut any of the plastic out

cut carefully and you should be able to reattach the removed plastic with suitable glue and then use a spray carpet adhesive to stuck the covering back...

polilara · « **Reply #21 on:** 06 December 2016, 08:01:34 »

Thanks again Doctor Gollum, no problem, just would like to confirm that I can do this as " the real method involves removing the dash". Afraid that I break something, but OK, I will try.
Do you recommend original matrix or just any spare?

Doctor Gollum · « **Reply #22 on:** 06 December 2016, 19:17:45 »

I bought mine new, via ebay iirc, sourced from same place as radiator and aircon condenser... around £35 iirc

polilara · « **Reply #23 on:** 08 December 2016, 15:55:59 »

Good Price, heard that original is more than 300 euro. I was recommended to buy a Behr one.

Doctor Gollum · « **Reply #24 on:** 08 December 2016, 16:58:36 »

Quote from: polilara on 08 December 2016, 15:55:59

Good Price, heard that original is more than 300 euro. I was recommended to buy a Behr one.

Starter for ten...

http://www.ebay.co.uk/itm/NISSENS-Heater-Matrix-OE-Quality-72655-/112194178457?fits=Car+Make%3AVauxhall%7CModel%3AOmega&hash=item1a1f4b4d99:g:UFMAAOSwcLxYHQXN

polilara · « **Reply #25 on:** 18 December 2016, 09:14:02 »

Quote from: Doctor Gollum on 08 December 2016, 16:58:36

Quote from: polilara on 08 December 2016, 15:55:59
Good Price, heard that original is more than 300 euro. I was recommended to buy a Behr one.
Starter for ten...

http://www.ebay.co.uk/itm/NISSENS-Heater-Matrix-OE-Quality-72655-/112194178457?fits=Car+Make%3AVauxhall%7CModel%3AOmega&hash=item1a1f4b4d99:g:UFMAAOSwcLxYHQXN

Thanks for good tip for new matrix. I already bought a BEHR one from local supplier. It was cheap but I think it is not a correct part. The width and height and in principal the length is the same as in the old one. The front end (where input and output located) is similar but the back end does not have the "returning" pipes. There is just a plastic end piece so the rubber end gasket with cuts with fits to the old one dos not fit to the new one. This rubber part also supports mechanically the matrix to its place. Are all these cheap matrix having this problem or do I just have a wrong part? Perhaps I could try to seal the back end with foam plastic etc. but this is something I really would not like to do. Please help.

Just info for Omega B (2001) owners with steering wheel in left side, changing heater matrix is not a very troublesome task. Just follow first what Doctor Gollum advised here and then utilize the guide in maintenance section. After having made a cut you just have to open three screws, one holding the pipes against matrix, the other supporting the pipes to frame and the third holding the matrix in its place. No other mechanical supports exists there. Then just pull matrix away. My Elegance model have a vinyl covering in the part of dash board I had to cut. I teared the vinyl first partly (very easily without heating etc.) away before cutting the plastic part so the vinyl can be glued back when job done.

polilara · « **Reply #26 on:** 18 December 2016, 10:30:35 »

I was too quick, the plastic cover in the back end of the new part was just a protection for transport but the new part is still not suitable as the "returning" pipes are all in the same position. In the original one every second is a bit aside...
So still wrong part.

polilara · « **Reply #27 on:** 23 December 2016, 09:19:48 »

Decided to buy original matrix as it seemed to have 12 pipes instead of 8 pipes like the cheaper ones. Perhaps needed here where we really have winter. In the package there was the rubber back sealing, O-rings, connecting screws and a black plastic bush having outer diameter 8 mm inner diameter 4.5 mm and length 6 mm. Does anybody know what this plastic part is and where to put it. I did not find that kind of piece when removing the old matrix.

polilara · « **Reply #28 on:** 27 December 2016, 08:02:17 »

Almost done, new heater is there and I am reassembling remaining parts. I have difficulties to refit the part no. 5 (vent ducting under the glove box) in the matrix side. It says "click" when I push it to it to the heater but pops down very easily. Should I push it deeper. It is mechanically so soft that it is difficult to put more force to it. Is there any trick to put it deeper (like double click) or should duct tape be used here, please help!

Doctor Gollum · « **Reply #29 on:** 27 December 2016, 11:07:28 »

Shove it home and refit the retaining pin

that's all it needs...

polilara · « **Reply #30 on:** 27 December 2016, 14:23:30 »

Thanks for comment, it looked that loose from rear side that I drilled a 1 mm hole through them both and installed a small screw. Now it really stays there.

Next step is to glue the dash board. Coolant already in so driving again soon. Does anybody know what is the price of this job if you go to GM-dealer?

polilara · « **Reply #31 on:** 30 December 2016, 17:08:08 »

Job almost done. Today I was driving without central console, glovebox etc., and realized that the air coming from nozzles is really hot now and also to the back seat, good! Could confirm that heater matrix was the case, special thanks for Doctor Gollum of all tips.

Doctor Gollum · « **Reply #32 on:** 30 December 2016, 18:05:03 »

Job well done

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Author Topic: Only cold air to the back seat even if heater in HI position (Read 4734 times)

STEMO