A few days ago while highway driving with the air conditioning on, it started blowing very hot air after working just fine.
I shut the system off, and continued to get residual hot air (not outdoor temp.) for about half hour.
When outdoor temp air was drifting thru the vents, i re-engaged the air and it worked fine
The car is an 05 A6
It has been fine since then.


Any ideas or help would be very appreciated