SOURCE: 86 s10 blazer does not blow air from face vent on
Start out under the hood looking for a small vacuum line to be loose or out of place on the firewall or at the air breather. Then you may need to pull the control panel inside all the controls air vacuum operated. You will find one main line that operates all thru a control junction. Best to go to a junk yard and operate on one there to see how it all hooks up before to tear into your daily driver.
SOURCE: How can I locate the blend door for the heater/defroster
Well FOR THE FIRST PROBLEM YOU PROBABLY NEED TO REPLACE THE THERMOSTAT IT IS MORE THAN LIKELY CLOSED SHUT NOT LETTING COOLANT INTO THE BLOCK TO CIRCULATE THE HEATED COOLANT 2ND THE UNIT IN WHICH CONTROLS THE TEMPERATURE OF THE INSIDE OF THE VEHICLE IS OR MAY BE BAD I WOULD START WITH THE THERMOSTAT FIRST BEING THIS IS USUALLY A MORE COST AFFECTIVE SOLUTION GOOD LUCK!
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