Bob Rentfro wrote:
I've never seen this...
My AC has worked fairly well this summer. I've had a little cold air
escaping through the defrost damper...not enough to warrent the pain it is
to change that pod out. Now, after the AC runs on auto hi for about 5
minutes, everything kind of fails in a mid position. It seems the fan wanes
and I get a whisper of cold air out of all the HVAC orifices. I can switch
to defrost and the fan becomes wicked strong and the air that comes out is
about 10 degrees high than the air out of the center vents when AC is
working well. What the heck is going on?
I imagine it's vacuum related, but I was wondering if anyone has seen this
before and had a clue for me...before I start on a vacuum troubleshooting
fest tomorrow.
So the blower is turning off and your just getting the amount of air you
would if there was a "vent" option? If thats the case the first thing
to check would be the vacuum switch, which is behind the glovebox. You
can use your mityvac to test to see if the switch is functioning. Also,
you can short the connector that goes to the switch (fan will be on
always) and watch the vacuum level with your MityVac.
If that test is inconclusive the only other thing I can think of is the
blower resistors... don't think there is anything in the servo that
would cause that failure, but don't know for sure.
Best of luck with it!!!
John
'79 300SD
