Heater vent control switch not working. - Cars & Trucks

ZappaNut

• 960 Answers
• Posted on Nov 18, 2008

SOURCE: Heater/AC control

sounds like the contacts are worn and it is arcing . remove the switch far enough to inspect the contacts and see if there isn't a burn mark on it.

SOURCE: merc c class heater problems centre blowing cold and sides hot

Bad vacuum pod, try using a mini vacuum and the on the valve block behind the glove box take suction on each one till you find the bad one.

SOURCE: 2002 Durango heater controls. The directional

if it works off vaccum you have a vaccum leak

Stephen

• 21873 Answers
• Posted on Aug 29, 2012

SOURCE: 2002 buick heater control

Usually a sign of a faulty blend door under the dash. You should have someone check the blend doors to see if they are working correctly.

mike loshbough

• 1011 Answers
• Posted on Oct 19, 2012

SOURCE: defrost, heater, vent switch isn't switching the control to a differnt source

There is a small vacuum hose that runs along the front of the throttle body.Usually gets brittle and brakes .This runs to the passenger side of the firewall this goes to the heater box.without vacuum the valve under the dash can not switch.I hope this helps