1997 A8 Heater Problem

[ssmyth182]

Hello,

I am having a problem with the heating system on my A8. Basically, the cantre vents work perfectly, however, all other vents blow nothing but hot air, no matter what I request from teh system. I believe this may be cause by the heater control valves stuck open. I have checked that the fuse is fine.

Can anyone describe where these valves are and how easy they are to replace. Alternatively I am open to any suggestion of how to fix this and would like to hear from anyone who has had the same problem.

Thanks for your help.

Stephen

[a8 tech]

The dual valve is located in the ns plenith chamber near the engine ecu

[ssmyth182]

Thank you,

Do you know if it is likely that agitating the valve may free the valves?

[a8 tech]

you can strip them down and have a play

[ssmyth182]

cheers,

Going to sound basic here, but are these air or water valves i.e will i have to drain the heating system or anything to remove the valves?

[a8 tech]

Coolant valves controlled by solenoids,i will double check.Clamp the coolant pipes and remove the valve

[ssmyth182]

Thanks very much for your help mate.

[a8 tech]

6168

dual valve as promised and coolant flows through them when the solenoids allow

[ssmyth182]

Thats great, I'll go hunting for them tonight, hopefully they will be easy enough to remove.

Thanks again