Quote:
Originally Posted by max76
Hi Jim,
Thanks for all the information, I think I'm just a little stupid!!!when I change the blower control module I try the climate control with the engine off and the car was sitting for about 5/6 days...in this weekend I try to turn.on.the engine and control the air flow....
I'll let you know!!!
Yes I have a service manual for 1990
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Don't feel too bad.
I have seen many a tech after putting it all back together get fooled for a moment, forget, and do the same thing.
The defrost air flow is the default in the event of vacuum loss, I suspect for safety to keep the windshield clear to see rather than keep the occupants comfy.
As the above post stated, airflow diversion is vacuum controlled upon instruction from the control head and programmer. Most common problem is a deteriorated or rodent chewed vacuum hose. The above post on how to observe the operation from above is a real time-saver!!!
Hopefully all will be fine once you start it up!
Marty