Gavin70248 Posted April 3, 2023 Share Posted April 3, 2023 Advice needed, My A6 has a heating problem, drivers side cold and passenger side hot, I'm thinking the matrix is clogged. Any suggestions on the procedure to unclog without removing matrix ....... I've done a diagnostic and everything thing is coming up as a pass. Any suggestions are really appreciated Gavin. Quote Link to comment Share on other sites More sharing options...
Magnet Posted April 4, 2023 Share Posted April 4, 2023 Hello Gavin, Heat out of the passenger side logically suggests the heater matrix is allowing hot water through it - unless of course there are two matrixes! - which is highly doubtful. More likely to be a heater flap control issue. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted April 4, 2023 Author Share Posted April 4, 2023 Thanks, I'll have a look tonight. Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted April 4, 2023 Author Share Posted April 4, 2023 There is plenty of air coming through the drivers footwell, just what's coming out is cold ?? Quote Link to comment Share on other sites More sharing options...
Magnet Posted April 4, 2023 Share Posted April 4, 2023 So does that still lead you to think the heater matrix is blocked because one side works and one side doesn’t.? Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted April 4, 2023 Author Share Posted April 4, 2023 That's what I'm thinking, diagnostic is saying everything is OK so my next step is to flush the system. Quote Link to comment Share on other sites More sharing options...
Magnet Posted April 4, 2023 Share Posted April 4, 2023 Sorry Gavin, I give up now. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted June 30, 2023 Author Share Posted June 30, 2023 Sorry for the late reply, been busy. The heater matrix was blocked and had to be replaced, all good now. The dealer I bought the car from repaired it for me, free of charge, which probably cost him a fortune as he had to buy matrix from Audi. He did say its something he's going to check on any audi trade-in from now on. So if anyone is buying private please check this. Cheers Gavin. 2 Quote Link to comment Share on other sites More sharing options...
Steve Q Posted July 4, 2023 Share Posted July 4, 2023 Glad you got sorted 🙂 Quote Link to comment Share on other sites More sharing options...
Magnet Posted July 4, 2023 Share Posted July 4, 2023 Apologies Gavin, but I’m still trying to get a logical understanding on this. Symptoms:- Passenger side hot. Driver side cold. You suspected a blocked heater matrix. I countered this suspicion since a blocked matrix cannot feed hot water to one side and not the other, unless there are two matrixes - each feeding one side only. If there are two, then indeed it makes sense. Does anyone know whether this model is fitted with two independent heater matrixes, each feeding independent sides of the vehicle? Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted July 4, 2023 Author Share Posted July 4, 2023 Morning Gareth, According to the garage the matrix had a blockage which was causing the problem. New matrix solved it. Gavin. Quote Link to comment Share on other sites More sharing options...
Entwood Posted July 4, 2023 Share Posted July 4, 2023 Might not be relevant at all, but a similar problem (heat one side cold the other) on a different car was also caused by a partially blocked matrix. It seems that a partial blockage allows a very low flow that provides a bit of hot water to give heat to one side, but once thats gone the "other" side only has lukewarm/cold water flow, so generates no heat at the vents. Replacing the matrix with a "freeflowing" one solves the problem as both sides get plenty of hot water. Hope that helps, although I accept it might not !! Quote Link to comment Share on other sites More sharing options...
Magnet Posted July 5, 2023 Share Posted July 5, 2023 Thanks Nigel, So if Gavin had turned the passenger side heater control down to a much lower temperature, he would have had heating on the driver side - ? Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted July 5, 2023 Author Share Posted July 5, 2023 Just like to add, no matter what the heating controls were at, the drivers side was cold due the blocked matrix. New matrix fixed problem. Quote Link to comment Share on other sites More sharing options...
Magnet Posted July 5, 2023 Share Posted July 5, 2023 So Nigel’s theory didn’t work in your case. Quote Link to comment Share on other sites More sharing options...
Gavin70248 Posted July 5, 2023 Author Share Posted July 5, 2023 Afraid not. Quote Link to comment Share on other sites More sharing options...
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