Not plugged in? Gas valve shut? Oil ran out? Thermostat /aquastat not calling for heat?
you have a bad heater core
bypass valve not opening
Check your coolant. Is it thick and gunky?
my heater fan in front of my 2004 chevy venture van wont work
did your heater switch go out all of a sudden or did some work like high work and low not work? if some worked your blower resister is most likely bad under your glove box
A common problem is that the heater resistor/ circuit board is defective and need to be replaced. The main symptom is that the heater fan with not run on the three low speeds but will run on high.
try the bend door
A blockage in the heater core is the most likely cause. This is a difficult and expensive repair.
There are a couple of reasons why a heater fan isn't working in a 1007 Malibu. The fuse may be blown for the fan or the fan motor may need to be replaced.
Check the starting directions, most gas heater pilots must have the button depressed for more than 30 seconds. If this does not work there is a problem with the regulator.
that has a lot to do with.if your heater core is pluged up you wont get any heat out of it.
if the thermostate is stuck open it wont allow the coolant to reach a certain temp. which could cause the heat to not work to well.