Sometimes it blows hot air and sometimes it blows cold air
Behind the glove box
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."
SOURCE: The A/C unit is not blowing cold air in the front.
your split manifold located on the firewall that sends and directs the refrigerant from the front and rear depending on your setting on the dash is plugged or the climate control on the dash is not responding and there could be a fuse,relay,broken wire,but there cant be a leak or either side wouldn't cool
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where is the actuator
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