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Low coolant level? Cooling system airbound? Bad thermostat? Water pump not circulating coolant? Heater control cable not working?
Why my Cadillac 1986 wont start
I have a 1978 coupdiville cadillac my blower quit working and there is a relay above your fuse box and if it goes bad your heater wont turn on. I had to replace it with a after market heavy duty relay away from where it is originally plugged in. Also my ground wire connection was dirty and wouldn't turn on until I cleaned the connection so try that and see if it works or you might need to replace the motor.
you have a bad heater core
that has a lot to do with.if your heater core is pluged up you wont get any heat out of it.
Open hood . Disconnect blower module located near blower fan. Disconnect, if blower shuts off, repalce module
I have a 1978 coupdiville cadillac my blower quit working and there is a relay above your fuse box and if it goes bad your heater wont turn on. I had to replace it with a after market heavy duty relay away from where it is originally plugged in. Also my ground wire connection was dirty and wouldn't turn on until I cleaned the connection so try that and see if it works or you might need to replace the motor.Fleetwood_brougham_BLOWER_wont_turn_onDiscuss:Fleetwood_brougham_BLOWER_wont_turn_onFleetwood_brougham_BLOWER_wont_turn_onbrougham BLOWER wont turn on?&content=&lng=en&uid=X4b8f331cb1dc6e1a Fleetwood_brougham_BLOWER_wont_turn_onbrougham BLOWER wont turn on?&content=&template={{title}} {{url}} (via @WikiAnswers)&lng=en&uid=X4b8f331cb1dc6e1a
Piston heater element open.
Check the fuse!
They might be locked.
bypass valve not opening
Likely heater core. I had same problem with 1996 S-10 with 4.3L.