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Easy fix you will need some vaccine line ..the blend door works off vaccume the vac line runs off the intake and runs into fire wall find the broken line and fix with the vac line ....let there be heat!!
you have a vac leak or broken plastic line . ck from the firewall where the heater hoses go in there should be a plastic vac line possibly red trace its path to the upper intake plenum I also think it has a vac canister looks like a can food comes in located on the fender well
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
OK THIS IS EITHER A VACUUM PROBLEM OUR A VAC SOL.PROBLEM SO. FIRST CHECK VAC HOSES YOU WILL SEE THEM ON FIRE WALL CHECK THEM FROM MOTOR TO INSIDE UNDER DASH TO VAC SOL.IF YOU HAVE TO DRAW VAC ON MAIN HOSE AND SEE IF IT COMES OFF DEFROST.
That means you lost your engine vacuum source and defroster mode is the default position. Check for the vac. line coming off engine to the firewall under hood if that vac line isn't damaged or leaking,check under dash allthe way up to the vacuum selector switch for the HVAC if you have good engine vac at siwcth around 17-18 inches of vacuum. Then it must be a faulty switch assembly.
on the right side of steering colum there is a plug. there is a wire that gets warm and loses connection. check by moving plug. my heater and ac would not work and caused the vacume swith to stay open.
could be a vacuum switch on the heater hose. The heater hoses are the small hoses ( 1inch, usually black or red) that run from the motor to the inside of the car. They should be warm when the car is up to temperature.
The vac switch controls the water flow to the heater core. If the vac valve is bad or the vac line that feeds it is bad it will not allow water to enter the heater core.
Could be a plugged heater core too.
Check the water level in the radiator as well. If the engine is low on water often the first to go is the heater.
is it blowing threw the defroster if it is open the hood look on the left hand side of the fire wall there is a vacuum line there if it is broke blower will only come through defrosters if you have a vac canister it looks like a ball make sure the vacuum lines are good on it
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