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 and controllable from cold to hot.
Starting the car, I dont 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.
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. I said I would mention it.
Heater solonoid? Heat core? Bad Relay? hot air blending actuator?
All ideas welcome, please!
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 and controllable from cold to hot.
Starting the car, I dont 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.
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. I said I would mention it.
Heater solonoid? Heat core? Bad Relay? hot air blending actuator?
All ideas welcome, please!
