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Heater core failure.
it has a partially clogged heater core.replace the heater core
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.
My bet would be the hot water heater cycling water through
This is an indication that your heater core is leaking. To stop the leaking you will have to replace the heater core or stop using your heater.
The heater core is leaking coolant.
AnswerBad thermostat, clogged heater core, or a defective heater control switch. If an engine has not been running long it will not have warmed up, the warmth from a car heater usually comes from the engine.
You burnt out the clutch probably or it's not in gear properly.
Not necessarily (although it is possible).I had the same problem with my Volvo in which the car would start then stall (and I had a full tank of gas!!!).
form_title=Repair Block Heater form_header=The block heater is an important part of any car engine. Keeping it running is important in cold months. When did you notice that the block heater stopped working?=_ Does the cabin heater still work?= () Yes () No Would you prefer a new or used part?= () Yes () No
could be the blower motor, a fuse, or a bad wire.
Your radiator may be running low on fluid. Failed thermostat, damaged heater valve, blocked heater core/heater hose or worn out water pump. it could be a couple of things like the themostat or the heater core .