it works by vacuum .if it is not working more often than not a vacuum hose is rotted. this one is hard to get at . it runs from the top of the engine to a round black ball down by the passenger front tire .start by finding the ball [a little bigger than a soft ball ]and trace the small hose back to the tee connector under the dog house [engine cover] i have used small gas hose and silicone and it works great.hope it helps and good luck.
On dash Switch that says vent heat, a/c defrost etc.
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch Defrost is the default position for this system
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors Check the operation of the selector switch
fuse? switch? Selector?
n ignition switch on a 1991 Chevrolet astro vanAnswern ignition switch on a 1991 Chevrolet astro van
defrost is the default mode. in most cases a vacuun leak is the culprit.
you can do somting
The 1997 Chevy Astro fuel relay switch is located on the firewall in the engine compartment. The fuel relay switch will be in the center of the firewall.
You lost the vacuume supply coming from the engine, defrost is the default mode if a mafunction in the vacuume supply is lost.
You will need to remove the ignition switch retaining ring in your 2002 Chevy Astro Van. Slide the ignition switch out. Remove the wiring harness from the end of the ignition switch. Reverse the process to install the new ignition switch.
under the dash on the passenger side