PHB

Had it fully checked out and it has been confirmed as the thermostat and water pump. I spoke to Audi UK head office and they said they are not aware of any issues with these parts or the extended warranty in the US and Canada, they look after the UK only!! I have had a few similar issues on this car and although it's a great car to drive I think it is going to be my last Audi.

Had a price from an independent for a new thermostat housing and water pump at £950 inc VAT, is that a reasonable price? I also contacted Audi main dealer from where I purchased the car and asked about the extended warranty that is in the US and they said they would come back to me. In true Audi fashion they they have not.

I completed a 210 mile journey this week and lost half the coolant reservoir and there was a damp area near the water pump. At the end of my return journey 210 mile, no coolant was lost, very confused. However I think I am going to get the water pump replaced as this appears to be a poor area on these cars. Not however a cheap job.

Hi Gareth. Reading it again it looks as if the extended warranty only applies to the US, I assume someone has taken Audi to court over the failure. You would have thought if it was good for the US it should be honored for all Audi A4. I will continue to inquire and give you feedback later. Regards Peter

I have just read an article on another website that suggests that there is an extended 8 year warranty on the water pump and thermostat on this car as it is a known area to leak. I can't be certain that mine in leaking from there but there is some damp in the area. Is anyone aware of a warranty.

Hi Gareth. I carried out the test you suggested, I drove 9 miles and then kept the revs up at 2000 for 3-4 minutes. The ambient temperature was about 10 degrees and the coolant temp was at 90 degrees and there was noticeable white condensation type smoke but with am ambient temp of 10 degrees would I not expect that? You mentioned additional tests, what did you have in mind? Kind regards Peter

So I assume, although it is the passengers side wing mirror, it could be the wiring in the drivers side and possible more likely as the drivers door is used far more than the passengers side.

Thanks Gareth, as you say, when, we get a dry day I will carry out the test. The area around the reservoir cap is dusty and perfectly dry, but yes I will purchase a new cap. The car has only done 40K miles and I really enjoy driving it, so I hope I can resolve the problem.

I understand there has been a post on this subject in the past but there does not appear to be any conclusions. I am losing coolant, about half a lire in 150 miles. The system has been pressure testing but the pressure held and there is no signs of any leaks. The garage suggested that it could be an issue with the head gasket with water finding it's way into the exhaust. They suggested if this is the problem then it my be the time to sell the car (not a main dealer). Has anyone had this problem and found the fault.

Could the change in voltage be caused by a bad connection on the wiring loom. I am assuming the door control module is OK as the drivers door mirror heats up fully.

The heater is working intermittently, I have replaced the glass with not change. The power to the mirror changes from 14 volts to 4.6 volts. The diver's side is working perfectly. Any ideas?

My fault was intermittent but I did not hesitate and changed the sensor which resolved all faults.

Thanks I have had mine changed about 18 months ago but with little confidence with the car I am going to carry a spare.

.any thanks, will have a look.

Where did you find a sensor for £10, the best price on ebay I found was £69.