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You have a vacume leal to the heating a/c system it has gone to defalt by blowing the defroster check the vacume lines coming of the passenger sid of the intake manifold ther will be a few hoses the one you are looking for is the one going into the firewall and will have a one way vacune ckeck valve in it if it in in backwards it will not alow any vacume to go to the system and it will not operate. ck to make sure that you have vac from the manifold to the line into the fire wall and if you do then the problem in under the dash and can be alittle more troble than you want to undertake.ch under the hood first as the lines tend to crack with heat and age.
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you broke. controls.
it or the connection;s so go back and fix what you broke.
if you cant find it, then use the FSM test to find why.
the FSM covers all that, in the HVAC chapter, full diagnosis and tests.
RTM.
check the windshield posts from the inside remove the front a pillars then poor water over the windshield edges accross the top of the roof. Sometimes rust forms between the windshield urethane and the metal surface where the windshield seals. If you see water coming down the post you need to check all the roof seam sealer points for pinholes and under the windshield urethane. You can do this next time you change your windshield. Next check for leaves stuck in the drains of the cowl venting and make sure the drains are free to drain.
you have a blend air door problem. if the control head is working properly then you should look behind the glove compartment for loose vaccum lines or wires.
behind the center counsel between the floor and the heater housing is a part that is called the blend door actuator. these usually go bad and have to be replaced.
The vent flap foam lining has come loose and needs to be removed or reglued . A spray on contact adhesive works best , don't glue the flap to the vent casing.
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