96 Grand Voyager A/C question

I've got a 96 Grand Voyager LE with V6 and the A/C runs fine as far as
cooling, but near every time I accelerate, say to pass, the venting
appears to switch to warm air and then back to A/C as soon as you get
off the accelerator.
Should it happen this easily? Sometimes it seems like any acceleration
causes this to happen. So is this normal? I don't remember it being
mentioned in the manuals.

 

Sounds like a vacum accumulator is leaking or disconnected. Any work done
recently on the motor? I'd start looking for a small vaum leak. In addition
there is a check valve that may be bad. This is if the air is switching form
dash to floor or defrost vents. If the air itself is just changing temp than
yes it can happen rather easily as the computer senses engine load and
throttle postion and will shut the a/c compressor down when you "crowd" the
throttle.
Larry

 

This, unfortunately, isn't all that uncommon. Many of the damper
actuators are vacuum powered. At full throttle, the amount of intake
vacuum drops dramatically allowing the spring loaded dampers to
overpower the vacuum actuators.

My Jeep Comanche had this problem in spades, partly because I had to run
the 2.5L engine nearly wide open much of the time. It had a vacuum
storage tank on it to help mitigate this, and the dealer installed a
second tank after I complained about what you mention above, but even
that didn't make a lot of difference. After just a few seconds at WOT,
the actuators would begin to relax.

I haven't noticed this with my 96 and 03 vans, but then I don't often
run them at WOT for any length of time.


Matt

 

depending how much you matt it the ac compressor is suppose to shut off
while in that mode

 

the ns van works on electric motors there is no vacum to the system

 

Thanks.

Larry it does appear that the air switches to the defroster vents as the
noise goes(comes from ) there and that's not even with WOT, just
acceleration to pass or make a quick move.

 

These vans are like many cars today. Under full throttle operation the AC
automatically cuts out so that maximum power is available for acceleration.
As mentioned by others, the air flow to different vent positions is
controlled by electric, not vacuum motors.