My heater switch to control my vent options don't work for floor heat?

2002 GMC SONOMA
155 MILES
Avatar
SANOMASLS
  • MEMBER
  • 1 POST
I have a 2002 sanoma 4x4, and am having problems with my heater not working on floor vent mode. I have tried almost everything in testing the vacuum lines. How I tested was disconnecting the heater and removing the group of vacuum lines from rear of the vent selection ****. I then start the truck to get suction from the main vacuum hose and use a jumper hose to complete the connection and actuate the various vent settings. I have even used a large jumper hose to try and test the vacuum pot down near the drivers gas pedal which has a red and a blue hose connected to it. In the end I am able to actuate all other vents but not the floor vents. Can you lead me in to the right direct to solving this problem.
Nov 13, 2011 at 6:09 PM
Advertisement
Avatar
HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
you have an actuator stickingor no vacuum going to it. those look like dash pots. generic ic enclosed.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Nov 13, 2011 at 6:16 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.