2006 gmc sierra no heat just cold air blowing

SOURCE: The air conditioner on the

its the actuators,take to shop tell them to replace.

honeymokey

• 3113 Answers
• Posted on Apr 15, 2009

SOURCE: air blend door

Replace the broken actuator.

Colin Stickland

• 22516 Answers
• Posted on May 30, 2009

SOURCE: a/c and heater only blow air out of defrost

either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold

Bobby Memory

• 258 Answers
• Posted on Oct 22, 2009

SOURCE: 1996 GMC blower motor only works on high speed.

more than likely yes the resistor

SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."