Why does my heater in my 1991 cadillac not work?

Question

it blows but not hot air brrrrrrrrrrr winters coming in michigan.,.,.,.,,.,.,.,,.

it is full of fluids. the fan works.can the climate control be bad ,,,,,,,,,,,

Answer 1

check the fluid level in your cooling system, it may be low, then you need to see if heater valve opening (mechanic work)

Answer 2

Low water in the radiator
Heater controll valve
Do this
Find the heater hoses where thy enter through the fire well.
Feel the top hose anf then the bottom
If it is hot on the top and cold on the bottom, the heater is stopted. up
If both hoses are hot but no heat, the heater controll door is closed and not allowing the heat to come into the car.
Check for a vacuum leak under the dash.
Hope this helps

Answer 3

you are not getting hot water to the heater core , when you turn on the heater you slide a knob that opens a valve under the hood this is the valve that diverts hot water to the heater core and give you heat ,my bet is its not opening , have someone slide the knob in the car as you watch what is trying to move under the hood .while under the hood you should be able move that valve to the hot position and have heat, the valve or the cable , is bad and should be replaced

Answer 4

common causes of no heat, low on coolant, defective thermostat, heater control valve not working, clogged heater core, clogged radiator, blender door out of adjustment, and the most uncommon but sometimes happens is the water pump propellars are worn away from ignored cooling sytems.
hope this helps...good luck

Answer 5

Check and make sure youre fans work.

Answer 6

i know i used it last winter!