On many gm's there's a vacuum resoirvoir on the drivers side, mounted
to the hood. It's a "ball" a bit bigger than a soft ball. Look
carefuly at the hoses coming to this. If one falls off or is cracked,
the a/c system will usually be stuck in defrost - all air comes out
the defrost ducts.
No high air.. do you mean it won't go to recirculate mode? Or the fan
does not change between position 3 and 4?
No recirc would be affectd by a cracked or disconnected vacuum hose
----== Posted via Pronews.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.pronews.com The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= - Total Privacy via Encryption =---
My diverter between defrost and mid doesn't move.
The servo checks good.
The diverter between defrost and mid can be seen from the mid air
outlet to the right of the radio. The Blue vacuum line from the vacuum
block behind the glove compartment controls the servo which is up
above and to the right a little of the gas pedal.
Another servo up there with White and Green vacuum hoses from the
block controls two? diverters in the main lower duct right behind the
The other servo in same location with Orange hose has a link that goes
down near the gas pedal linkage and controls the Recirculate door.
Mine is no vacuum to mid vent servo.
Temp fix switched Recirc vacuum line to mid vent servo.
Full mid vent hit Recirc button.
Also glued about a ten inch stick in the vent to the right of the
radio to hold the mid vent diverter open about 1/4 inch so I have a
little mid air all the time.
After my rear stops hurting from sitting and laying on those bloody
seat belt ends sticking up between the seats I will replace the vacuum
hose to the tank in the fender and tackle the programmer.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.