Blend door sticking not sure if this year has an electronic actuator for the door or not
SOURCE: 98 Jimmy throws out heat but won't switch to all vent options
Your going to have to replace the switch. The switch it self may have gone bad, since it works on a vacuum. It's common for the diaphragm in the switch assembly to go bad, if it's not the switch. Then it's going to be a bad actuator door and will need to be freed up. I have found it to be the switch it self get dirty and the vacuum needed to activate the actuator door is not there.
Good luck and keep me posted. When you turn the switch from defrost to heater, do you hear a air leak??? If you do then it's a good chance that it's the switch it self.
SOURCE: blower wont blow out ac on 97 gmc jimmy
pop the hood and check to see if your ac pump is turning or just free spinning if it isn't spinning then u might have tripped the low ac pressure switch and may need to be checked for leaks and recharged
SOURCE: my a/c will only blow out the defrost in a 97 gmc jimmy
It is either the servo door could be blocked by something like a pencil falling through or something falling and blocking it from opening. Or it is actually broken. I have seen them both ways. Mine was actually broken in my Ford F250. You should still take it in to someone who can deal with it for you.
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