Hi again,

I got some great help with my last problem, I'm hoping ya'll can help me with this one.

My heater/ac controls will only blow hot air out of the defrost vents. It blows low or high, but only warm air and only out of the defrost.

Any ideas, suggestions, fixes?

Thank you so much!!

Yep, you figured it out, you got a vacuum leak.
Even my '91 had the same exact symptom.

Find it and fixed it already?

I went ahead and bought a hand vacuum pump just to find
the same problem. Kinda like using a meter to track down
electrical problems, see? Easy as anything and thorough
too since you can test the repaired system until it holds a
vacuum.

Bet you can rent one from and auto parts store for free.

On my Dent replaced all the vacuum hoses with fuel hose.
...3/16" fuel hose can be had at certain auto parts stores.
Over the years that dangged ordinary vacuum hose has
failed me too many times for me to trust it anymore. YMMV

The metal can rusted out on me even here in Arid-zona...


Alvin in AZ

Hey Alvin,
Thanks so much, I actually had a line that was not connected. Fixed the problem immediately!