Could be,
heater blower motor has failed.
blower motor fuse is burned out.
blower motor speed resistor is burned out.
blower motor switch is bad.
or, if the blower motor works but you have no heat it could be,
cooling system is low on coolant.
thermostat is stuck open.
heater core is plugged.
temp blend door actuator is faulty.
Torque converter going bad.
Heater coil
Heater hose or heater core.
Check the A/C fuse, that's what happened on my '85.
No...
I need to know how to replace the heater core in a 1987 cadillac seville. I would like to have step by step instructions on the removal and replacemnet of this part. Where it is located and how to remove it
The cooling fan at the radiator is not coming on. Running the heater take heat out of the coolant as it goes through the heater.
No
It rusted out
yes i use it when i do alot of city driving but on the hwy i would recommend 93 octane
Most likely a blown fuse
a bad water pump could cause low heat. The heater uses the coolant from the pump to generate heat.