You have blown a fuse. Google image search for "91 tempo fusebox diagram" Good news fuses are cheap and easy to replace, box is under the steering wheel.
The fastest way to defrost a windshield is to turn the defrost vent on without heat or simply open the windows. Another option is to warm the inside of the car by turning the heater on.
That means either you have air in your heater core or your heater core is being bypassed
a heater hose runs from intake to heater core to radiator. the heater core is were the heat comes from inside the car as well as defrost
Yes they have a heater/defroster.
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
it should if you have the heater control in the defrost position this is to remove the moisture from the air
Blocked heater core, faulty heater valve, disconnected connection to the heater valve.
Yes, the ac will run in the defrost position to dry the windshield.
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
2001 dodge ram 1500 ac and heater flow regulator switch does not work. works only on defrost. How to fix?
you have a fuse out...
the heater core is going out