Chevrolet Repair: 98 blazer computer climate control, vacuum actuators, vacuum leaks

Question
I have a 98 chevy blazer w / comptuer climate control that only blows out hot air. If i set the temp higher the air gets hotter , but no matter how low i set it , i  always is hot. possible cause ?

Answer
HI LARRY,, WELL WITHOUT BEING THERE TO CK THINGS OUT I CAN ONLY SAY IT IS ONE OF 2 THINGS...THE FIRST BEING THE CLIMATE CONTROL HEAD IN THE DASH IS FAULTY NOT SENDING THE CORRECT SIGNAL TO THE BLEND DOOR, OR THE LEVER OR GEAR WHEEL THAT MOVES THE BLEND DOOR IS STUCK OR BROKEN... MY ADVICE WOULD BE TO GET UNDER THE DASH AND REMOVE AS MUCH DUCT WORK AS POSSIBLE AND MOVE THE HEATER LEVER FROM COLD TO HOT WHEN RUNNING AND SEE IF YOU CAN GET YOUR EYE ON THE DOOR ACTUATOR,SOMETIMES YOU CAN,SOMETIMES YOU CANT. SEE IF IT IS MOVING OR TRYING TO MOVE. IF IT LOOKS LIKE IT IS TRYING TO ACTUATE AND CAN NOT THE BLEND DOOR IS STICKING,COULD BE THE GEAR OR THE DOOR IS LOCKING UP ON THE DUCT CASEWORK..ALSO I AM NOT SURE WHAT YEAR GM SWITCED FROM VACUUM ACTUATORS TO ELECTRIC. WHEN UNDER THE DASH IF IT IS VACUUM OPERATED LISTEN FOR ANY VACUUM LEAKS,SUCH AS SPLIT VACUUM HOSE OR VACUUM DASH POT LEAKING..HOPE THIS HELPS YOU..