91 Gr Caravan 3.3 blower fan cuts out

I have a '91 Grand Caravan 3.3L (no air conditioning) and on hot days,
I crank up the heater blower to get some more air circulation. When
going uphill under load, the blower fan just stops ... very noticable
as the cool air flow disappears immediately. As I get to the top of
the hill and back off the pedal a bit, the fan resumes normally.

Any suggestions?

Rod Corkum

 

Possible loss of vacuum causing the air to be rerouted to the defroster or
heater vents?

 

Yes, and a vacuum leak might also have something to do with your
hesitation problem. No telling how a computer controlled "closed loop"
system will react if the motor is running in an "unknown" state. The
computer could interpret sensor signals incorrecty and make
inappropriate adjustments to the engine running parameters.

This would explain no codes being set too! The sensors are working
just fine, but what they are reading was not planned for in the system
design.

Perhaps you need a new intake manifold gasket?? Vaccum leaks can be a
pain in the neck.