Endeval
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Posts posted by Endeval
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Hi all,
2013 A6 C7 Avant, 2-zone heating.
Problem: No heating/hot air normally. Intermittent issue, rarely works.
When driving, I have tried all combinations to get hot air without luck - A/C on/off, shuffling through blowing directions, hot/cold/max-hot, recirculate, windscreen, turn off/on, etc. When the issue happens, the flow and return heater hoses to the heat core/matrix is warm, with the left-side flow hose hotter.
I have found on a number of occasions that starting the car again 30 mins later, the heating would work perfectly well, full heat at max blower.
Example, I drive somewhere, park and return - heating is OK - but again intermittent. Yesterday while about 30 mins into my journey with just cold air, I turned off the system for about 15 mins. I then turned it on and had full heating, controllable from cold to hot.
Starting the car, I don't hear any clicking, etc which might suggest a stuck or slipping blender.
If I turn temps to minimum while on auto, I can hear re-direction, cold air and increased flow, so it *seems* thermostats are working (?).Leading up to this, when adjusting direction from auto to windscreen, the screen would fog up heavily, as if there was water/moisture held. Probably a red herring, but said I would mention it.
Heater solonoid/valve? Bad Relay?
All ideas welcome, please!
A6 C7 Avant, intermittent no hot air
in Audi A6 (C7) Forum
Posted
Hi all
Coming back to this now....I did some more testing.
I could be driving for an hour or two, still cold air....
if I turn off the car and ensure ignition is out and all off (open drivers door), when I restart the car, most of the time, I will have warm air almost immediately.
Is there a chance it could be the hot water solenoid (heater control valve) gone or electrical issues?
p.s. my car never hits 90c water temp, about 75c - that could be coincidence, maybe a faulty temp sensor?
thanks!