Leaderboard

I wound up breaking the switch off and replacing it with an OEM piece. In the end after replacing the master, booster, and bleeding the lines three times I was still unable to get a hard pedal. It is in the local shop as we speak. Hoping wiser minds can figure it out. I will post upon diagnosis..

Thats very helpful thanks

Just collected a New B10 A5

You have nothing to lose by back flushing the matrix, ideally with 1 bar or more pressure, though don't be too optimistic of success. Let the flushing water go to drain in case it does push out some solids.

Max. If you are expecting a solenoid valve on the coolant system you will be disappointed. Cabin temperature adjustment by control of coolant flow was abandoned years ago. Maybe you already know that, but I mention it just in case. Temperature regulation will be by mixing hot and cold air by means of flap valves in the air ducts. I don't know if the flaps on your car are entirely mechanical or electrically powered. Note that electric flaps are known to be prone to failure. There is also the possibility of a partial blockage of the heater matrix which can be caused by scale or by crystals of silica gel that have escaped from a bag in the coolant reservoir. (Bags of silica gel in the reservoir were installed for a few years by Audi.) I am inclined to think the latter because such crystals also prevented the thermostat from closing, which may explain why yours was missing. There are videos on Youtube explaining the silica gel problem and how to change the heater matrix if necessary.

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