Here we go again..........Heater Woes
 

Well, it's that time of year, and you expect the heater to work?

Nope, took a ride today, and the only heat was off the heated seats.

Took a scan, and found:

Address 08: Auto HVAC Labels: 4H0-820-043.clb
Control Module Part Number: 4H0 820 043 D HW: 4H0 820 043 D
Component and/or Version: Klima 3 Zonen H14 0061
Software Coding: 3621002800
Work Shop Code: WSC 02313 785 00200
ASAM Dataset: EV_AirCondiFront 001050 (AU64)
ROD: EV_AirCondiFront_AU64.rod
VCID: 21503B5361C9138A302EBB9-8075
1 Fault Found:

0378 - Coolant Circulation Pump
B10D0 04 [009] - Internal System Fault
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 3
Fault Frequency: 1
Reset counter: 217
Mileage: 175128 km
Date: 2016.11.11
Time: 21:03:57

Has anyone seen this before? is there a circulation pump just for the blowers? Where is it? Are they easy to change?

Cheers

Not had an issue with heat but there has been issues with electric coolant pumps.
See D4 - Common Faults - Wiring Loom Issues.

Cheers Joe,

searched "0378 - Coolant Circulation Pump" to no avail.

strange...it was there all along?

Sounds depressingly similar to the Auxiliary Coolant Pump that afflicts D2s and I think D3s to a lesser extent.

Yes, I had this on my car - was repaired under warranty so no idea of cost - but I don't think it was a huge job! Good luck.

Take a look at this thread - maybe helpful

http://forum.a8parts.co.uk/showthread.php?t=11613

were the blowers cold too Paul?

Honestly I couldn't say - no so as I had noticed.

Thanks for pointing me to the other thread guys.

Took her for a spin today, warm air from blowers within 2 miles.

Then shortly after, all cool again.

So........i suspect from cold, heat builds up in the heater matrix and all is fine.

But.... as soon as the engine hits temp and the thermostat opens, i'm losing flow to the matrix, cos the pump is u/s, and all heat goes towards the radiator.

Fingers crossed, ordered the pump, i'll let you know how it goes.

Albert

Well, pump arrived this weekend, installed, all is good in the world again..:ROFL:

Idiots guide, with photo's attached, hopefully it'll help someone else as much as a8parts forum has helped me over the last few months.

Albert

Well done made and a great guide +++

Thanks for this +++,my job for next week :ROFL:

Hi guys,

for info, the car is cold again, according to VCDS the pump failed at the end of August, but it's only recently turned cold enough to notice.

I've gone the aliexpress route this time, the last pump lasted ~5yrs.

https://www.aliexpress.com/item/4000833782805.html

Looks like i'm swapping it over the Christmas break :(

Albert

Having looked back at my first post........it lasted ~7yrs

Mines is doing something similar but not quite the same and think I saw a similar message pop up about circ pump. I get heat randomly and nothing from dash vents. Only seems to blow windscreen n warmer on pass side. I also know the flap thing behind glovebox needs replacing

I'd bet a tenner it's the pump.

The "random" heat you speak of, is it when you throw the car round a corner, and the momentum moves the water through the heater matrix?

Mine gets warmer if i drive it like i stole it :)

That statement brings back memories. I had a brand new Audi A4 back in late '95 that exhibited the same problem joining a slip road from a roundabout. Only happened on left turns.

Only time I had those symptoms was after a major service (long ago) at Audi when they didn't top up the coolant properly. Easily fixed by me.

For info, the pump arrived the other day, and it's bloody different.

It works perfectly, the car is warm, and the fault has cleared in vcds, but the mounting holed were different.

I've adapted the mount slightly, so it fits, but "next time" i'll take more attention when ordering.

Albert