1991 350 SD
No matter how I set the climate controls I get Hot and Cold blowing at the same time.
Hot from windshield and upper side.
Cold from center and lower side.
Nothing from the bottom Ever.
Has NO ONE had this problem?
I got no responce for my last thread.
ANY IDEAS? Please help.

possible monovalve problem? do a search and see what you find...

__________________
1994 C280
2009 VW Tiguan
1993 Toyota X-tra Cab SE-5


1973 220D ... Gone, but not forgotten
1991 Alfa Romeo 164L Gone, wife MADE me forget it

2006 Hyundai Tucson... just straight out FORGOTTEN!

Thanks for Helping

I faced the same problem.
Decided to change my (duo)valve.
Its cost (120.00) encouraged me not to pursue a much more complex and expensive possibility (such as a kind of alzheimer in the a/c electronics)
If the fix works, Ok.
If not will go further.
The car is 10 years old and chances are im my favour.
In between: I don't know why but heavy traffic used to provoke the symptom. Also, keeping the termostat a bit lower tends to minimize it.
The replacement is in process.
I will post here if the issue goes on.
Jorge