UrS6 Heater is useless

[Vorsprung durch Technik]

Macspring,i have stumbled/come across and read quite a few references to these cars you own but never seen any pictures.Do you have any?

[macspring]

Thanks Dave.

Now using one of my urS6 Avants as a daily.

[UrS4boy]

Bump, any updates or comments on the lack of interior heat in some urS6 cars in this thread ? Thanks.

I can tell you that I did the heater core in my 98 C4 avant in April 2013 and since the weather got warmer after that, I didn't have the need for heat until late August 2013 when driving through the mountains, in a rain storm, coming home from camping at a lake. NO heat. Wife not impressed. Fortunately she had a blanky and the heated seats worked. Then we came out of the mountains into 23C weather.

When I got home, I took off the rain tray, the wipers, the metal/mesh wiper base and the wiper mechanism. to investigate the main heat flap on the heater box. Some how the linkage between the flap and the flap servo motor had come off and the the flap was closed, i.e. no air was going through the heater core. Quick fix, reassemble and instant heat. Duh. My bad.

Follow this pdf to get to the flap servo motor: http://12v.org/urs/FredMsTempFlapMotorR&R.pdf

Good luck.

[macspring]

Bump, any updates or comments on the lack of interior heat in some urS6 cars in this thread ?

Thanks.

[macspring]

Tom,

Did you get to change your matrix ?

Did it help ?

Was there another different item at fault ?

Thanks.

[urS6Tom]

i've got a similar problem with the heater in the S6 - just won't get hot unless i really rev the car, or put the temp on HI

coolant level is fine and i've bled the pipes going into the bulkhead

have checked VAGCOM and not seeing any codes on the HVAC channel, but not entirely sure i'm checking it properly

anyone got any ideas what it could be? I'm taking the dash out anyway as part of an interior swap so might as well change the heater matrix at that point?

[s2_wot]

Channel 52 I've got numbers 3 and 9 so
3. ECON mode selected
9. A/C Manually switched off

Channel 53 I've got numbers 5, 10, 15, 16, 17 + 20
5. Central flap in footwell / defrost outlet position. (Flashing rather than permanently lit)
10. Airflow flap open. (Flashing rather than permanently lit)
15. 1st speed of coolant fan on
16. Fan for in car temperature sensor
17. Fresh air / recirculation flap closed
20. A/C compressor on

Between checking channel 52 and 53 the settings of the system may have changed so I'll check them again.
Does any of the above point to a common failure from anybody's memory?
Does the A/C have to be on all the time?
Is there a best setting for the whole system while taking these readings?

Channel 51 is showing good temperature (80-87) whilst stationary.

Should I record all of the channels to try figure out what's wrong?

Any help appreciated.

[HMS-S6]

mine isnt great at the moment,going to spend some time on it tomorrow sick of being freezing cold while driving around,on the otherhand my a6 tdi heater is amazing but being 2wd is useless in this snow

Mine was brilliant until i did the pump, so i hope its not bled all the air out.

[spink]

mine isnt great at the moment,going to spend some time on it tomorrow sick of being freezing cold while driving around,on the otherhand my a6 tdi heater is amazing but being 2wd is useless in this snow

[s2_wot]

I have to say I completely mis-understood those codes the last time I looked through it.
I will try again tomorrow.

[UrS4boy]

C4 UrS Climate control codes

mine in crap too , code 53 is the coolant temperature. It displays this as 85, does that mean 8.5 or 85?

Channels 52 and 53 are CC the diagnositic codes:



The coolant temp in the heating system is measured on Channel 51 of the climate control. The heaters are not crap. We have the same heaters in Canada and it gets very cold here and people do not complain (well they complain, but it is in general about the cold, not specifically the Audi heater). Most likely you either have a diverter valve issue or the one of the air-directing flap valves is not moving correctly.

You need to pull the codes. Here is the how-to link:
http://12v.org/urs/Climate%20Control...0&%20Codes.pdf

[HMS-S6]

mine in crap too , code 53 is the coolant temperature. It displays this as 85, does that mean 8.5 or 85?

I believe this is the reading in deg C of the engine coolant. It just worries me that mine was like being baked alive untill i did the pump Thats what you get for trying the do the job 'right'

[s2_wot]

mine in crap too , code 53 is the coolant temperature. It displays this as 85, does that mean 8.5 or 85?

[HMS-S6]

No the heater is not self bleeding, under the plastic rain cover by the windscreen where the wiper motor is left hand side of the engine bay as you look at you will see the 2 pipes that go through the bulkhead, one or both will have a bleed screw on it, bleed the heater that way with the heater full on and engine running, you may need to top the coolant afterwards. If the heater is full of air you may need to give it a couple of goes, revving the engine a bit helps also to pump the coolant round.

Thanks, i did do this after i filled it, maybe i need to give it another go. . . .

[HMS-S6]

I had this too on my S4, its really not very useful for this time of the year..

Apparently the heater matrix is self bleeding so it shouldn't be that.

God luck..

Thanks Bo,

Not that bothered that the heater is crap, just concerned that the new pump isn't feeding the rest of the engine as it should.