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Heater Control Valve Location.

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August 9, 2025Aug 9

Hi all. I am trying to locate the heater control valve on my Audi A3 8V Sportback 30 TDI (115 hp Diesel DGTE).

I've searched and watched every available video on the subject on YouTube but none of them show exactly where the valve is situated.

I've obtained a replacement valve, and have confirmed via a number of sources that the valve is the correct part.

Can anyone please point me in the right direction to find this. I am totally familiar with how a cooling system and cabin heating system works. I just need help in locating this valve so I can eliminate it as the cause of my fault.

Thanks in advance. Steve.

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Help darnest thing new engine falters and doesn't have power
Audi Q5 Club

Help darnest thing new engine falters and doesn't have power

crashoverride · 8 hours ago8 hr

I got a weird one. I'm fairly car literate and I'm usually able diagnose and know the problem to pull in to my local independent shop and tell them this and this need to be fixed and replaced. But this has me stumped. I have a 2016 Q5 2.0 engine that went bad with carbon deposits yada yada... So I stepped up got a new motor from Power Engines it came all crated up they were super helpful pleased with them. My mechanic moved all the bits and reattached them to the new engine from the old. Everyt
- 4 replies
- 73 views
crashoverride

8 hours ago8 hr

crashoverride

6 hours ago6 hr
engine
Audi Parts and Accessories For Sale & Wanted

engine

coupe4 · 9 hours ago9 hr

hi guys,this is probably a long shot but im looking for an engine for my 1998 a4 2.8 [engine code ACK],i bought the car through the forum a few months ago and got it shipped here to ireland,it has low compression on bank 2 cylinders so a replacement engine is my plan,if anyone knows of one for sale or point me in the right direction id really appreciate it,thanks Greg
- 3 replies
- 34 views
coupe4

9 hours ago9 hr

cliffcoggin

6 hours ago6 hr
Gearbox service
Audi Q5 Club

Gearbox service

Pete A · Sunday at 11:23 AM1 day

Good day all, I have a 2.0 TFSI with the ZF 8 speed auto ‘box which I intend to get serviced within the next couple of months. Is this just an oil and sump/filter change or is there mechatronic seal (for the wiring) on these? I’m going to get the oil changed in both diffs and the transfer ‘box, is there anything else within the drive train that needs looking at while it’s on the ramp? Mileage is 65,000 miles.
- 2 replies
- 118 views
Pete A

Sunday at 11:23 AM1 day

Pete A

7 hours ago7 hr
Servicing
Audi A3 (8Y) Forum

Servicing

Titanium · Saturday at 12:12 PM2 days

Although not required as yet, I'm thinking /looking ahead and wondering about servicing costs. Like all Audi dealers/dealerships it's best I guess to have your car serviced by Audi but I'm sure the price/s will not be as cheap as independents? (Yes they would have to use genuine parts). Does this forum show recommended companies i.e good garages that will be cheaper but carry out as good work as Audi. I look forward to guidance. Thank you.
- 5 replies
- 201 views
Titanium

Saturday at 12:12 PM2 days

Titanium

9 hours ago9 hr
A6 c5 allroad seats
Audi Parts and Accessories For Sale & Wanted

A6 c5 allroad seats

matty_s6 · May 27May 27

Due to turning the car into a track car, the seats and door cards are no longer needed. They are green and grey with wooden look trim. They need cleaning up and the rear seat is damaged at the top plastic part but it still locks in place. £200 ono with the wooden look trim. Collection only though from north west, near Preston. I also have other trim pieces from the c5 saloon that are now out of the car.
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matty_s6

May 27May 27

matty_s6

15 hours ago15 hr
Audi S6 track car build
Audi A6 (C5) Forum

Audi S6 track car build

matty_s6 · May 27May 27

Ok, after completing the gearbox swap and driving the car for a few months, things have started to fail. The speedo doesn't work, even after putting in a speedo pickup in the gearbox, sensor and repairing the wiring. The electric windows all stopped working. The central locking won't work. The airbag and abs light work as they please. My next step is to strip it and turn it into a track car. I know they are not known for being great on a track, but I will try anyway. The seats are very heavy, so
- 5 replies
- 283 views
matty_s6

May 27May 27

matty_s6

Sunday at 09:15 PM1 day
A1 A/C blocked
Audi A1 Club

A1 A/C blocked

Zacy2566 · Sunday at 12:27 PM1 day

Hi, I’ve recently got a second hand A1 2012 S-Line 3dr. I took it to Halfords and they have advised I have a blocked Air con. I’ve just replaced the the air filter and cabin filter as they were past due. Does anyone know if I can unblock the A/C myself and if so how to do it and what I’m looking for. Many thanks in advance
- 4 replies
- 137 views
Zacy2566

Sunday at 12:27 PM1 day

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Sunday at 08:19 PM1 day
Would You Add Bluetooth to a Classic Audi?
Classic Audi Club

Would You Add Bluetooth to a Classic Audi?

Baltic Retrofit · Sunday at 11:42 AM1 day

Recently had a few of these Audi Gamma & Delta on the bench for a Bluetooth retrofit. Personally, I think this is one of the best upgrades for a classic car You keep the factory radio, 100% factory look, but gain modern Bluetooth functionality. Curious what others think. Do you prefer keeping everything completely original or making hidden upgrades that improve usability?
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- 75 views
Baltic Retrofit

Sunday at 11:42 AM1 day

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Sunday at 03:56 PM1 day
Door hinge replacement
Audi A3 (8P) Forum

Door hinge replacement

vr6bro · June 6Jun 6

Hey guys im from new zealand, i got a a3 8p with a vr6, it has 45xxxkms. it has front right damgage and the door was hit in the crash, Im trying to replace the front right upper door hinge but its impossible to access the inside bolt to remove it from the body. Ive searched everywhere on google and youtube and audi forrums and have seen no one try this repair or any advice. Has anyone on here attempted something like this or seen someone do it??
- 6 replies
- 239 views
vr6bro

June 6Jun 6

cliffcoggin

Sunday at 03:15 PM1 day
No sound, recommendations for a repair service.
Audi Servicing and Repairs

No sound, recommendations for a repair service.

Stef-Wulfhere · July 13, 20241 yr

Hi, my Audi MMI MBI (i think glovebox unit) speaker sound seems to be failing, everything seems to work, there is just no sound. sometimes it works but this has become increasingly rare. It only seems to work once every 4 weeks ish now. I resorted to a Bluetooth speaker but its a bit rubbish to be honest. I believe it probably just a few PCB components that have failed. I'm looking for any recommendations for a repair service. Thanks all
- 4 replies
- 1,036 views
Stef-Wulfhere

July 13, 20241 yr

Baltic Retrofit

Sunday at 11:22 AM1 day
Having problems working out my fuel tank capacity -
Audi A6 (C8) Forum

Having problems working out my fuel tank capacity -

Steve132 · Saturday at 09:12 PM2 days

Hello I am a new Audi owner and have a A6 40tfsi C8 Facelift Sport Saloon. The car has been everything I hoped it would be -quiet and smooth on the road with enough power to keep me happy in retired life. When I first received the car it had a quarter tank so when it reached only 30 miles of fuel left I filled it up to the brim but could only fill 53 Litres. I have again run the car to show only 30 miles remaining and again can only fill 53 Litres before the tank is full I have checked th
- 4 replies
- 131 views
Steve132

Saturday at 09:12 PM2 days

Steve132

Sunday at 10:56 AM1 day
Extended diagnostic pids
Audi A4 (B8) Forum

Extended diagnostic pids

Rad4 · Sunday at 09:24 AM1 day

Hi all, New user here, hoping someone can help me out with this 😁 I'm trying to map out some extended diagnostic pids (uds mode 22) for my a4's ECU (Bosch EDC17). I've already found a few through cross comparing the pids my ECU responded with with carista: 22114F: DPF soot mass (g) 221156: Distance since last DPF regeneration (km) 22115E: Engine runtime since last DPF regeneration (hours) 221100: Coolant temperature (°C) (Hope these help any users in the future) These are tiny in comparison to h
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- 64 views
Rad4

Sunday at 09:24 AM1 day

Rad4

Sunday at 09:24 AM1 day
1992 Audi 80 Piston Ring replacement
Classic Audi Club

1992 Audi 80 Piston Ring replacement

Mike651 · Saturday at 08:56 PM2 days

Hi all, I’ve just got my hands on a 1992 2.6 v6 Audi 80 in good condition (considering price) and have done what most buyers do first and changed the oil. It was very murky and smelled strongly of petrol so I decided to flush. 4 times I flushed and drained each time after letting it run for around 10 minutes. The oil would not clear up and was persistently murky and fuel smelling. After doing a bit of my own research I believe my piston rings may be worn and allowing excess smoke and fuel into t
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- 104 views
Mike651

Saturday at 08:56 PM2 days

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Saturday at 09:39 PM2 days
Having trouble with charging at public charge points.
Audi Q5 Club

Having trouble with charging at public charge points.

Andy Dodson · Saturday at 06:51 AM2 days

Hi all On a bit of a road trip, have planned the route around type 2 charge points. I can use my own charge cable ok, but even though the last energy supplier took a holding deposit, the charge failed to initialise and the deposit returned. It has happened several times now and makes me think I have a setting wrong in the car. Any help or advice will be greatly appreciated. I will post details of the trip at a later time in the appropriate thread. Andy
- 3 replies
- 144 views
Andy Dodson

Saturday at 06:51 AM2 days

cliffcoggin

Saturday at 09:36 PM2 days
Adblue fault no restart after 650miles, Error codes P20BC,P20E8
Audi A4 (B9) Forum

Adblue fault no restart after 650miles, Error codes P20BC,P20E8

Doctor786 · October 16, 20223 yr

I had this message 4 months ago as well but simple turn off the engine and restart again solved the issues but the same issues has come back last week but this time with engine management light as well. It started the countdown to 650 miles and when it got to 550 miles some how it disappeared but came back after I did almost 300 miles. So countdown is down to 600 miles again at the moment. I am getting 2 error codes. P20BC : Reductant heater "A" control circuit high P20E8 : Reductant p
- 34 replies
- 96,979 views
Doctor786

October 16, 20223 yr

Stevey Y

Saturday at 05:44 PM2 days

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Heater Control Valve Location.

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Topics

Help darnest thing new engine falters and doesn't have power

engine

Gearbox service

Servicing

A6 c5 allroad seats

Audi S6 track car build

A1 A/C blocked

Would You Add Bluetooth to a Classic Audi?

Door hinge replacement

No sound, recommendations for a repair service.

Having problems working out my fuel tank capacity -

Extended diagnostic pids

1992 Audi 80 Piston Ring replacement

Having trouble with charging at public charge points.

Adblue fault no restart after 650miles, Error codes P20BC,P20E8

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