SOURCE: 93 gmc sierra heater not working
THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER
SOURCE: 2002 GMC Yukon blows cold air from the front, rear works fine
check you antifreeze level and make sure its full
SOURCE: a/c and heater only blow air out of defrost
sounds like there is a vacuum leak, possibly under the hood.. Vaccumm is needed to change the mode doors.
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
SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem
your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps
Testimonial: "Very good information. THANKS!"
Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.
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