Defrost anan vent work but nothing when switched to the floor
Transfer case switch may be bad allowing trans fluid in vac. Lines and can reach as far as heater switch common problem fix these all the time 17 bucks for tranfer case switch and 20 foot of vacume hose and replace all the vac. Hose because this issue causes pcv to not work correctly so the moisture from crank case ends up going out the distributor vents causing cap and rotor corrosion there is service bulletin to remove distributor vent screens i would fix that since you will be working next to it any way
SOURCE: heater control 98 chevy s10 blazer
These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.
SOURCE: 1996 chevy blazer my air on heater will not blow
the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up
SOURCE: I have a 2003 chevy blazer but no heat,nothing but
Start by flushing your coolant system and replacing your thermostat. You may later find that you have a clogged heater core.
SOURCE: my heat works but it doesn't blow out of dash vents
A vacuum hose has come loose or broken under the hood.
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