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by heater i take it you mean the blower motor.these work on a fuse and or relay and a set of resistors.but start by checking the fuse as you said you have no poower.if the fuse is ok then check for power at the plug on the blower motor, you will have to disconnect the plug at the blower motor and have a tester placed on 12 volts to perform this test.turn ignition to the on position and turn on the heater unit,you should have a reading of some kind .if you have up to 12 volts then the wiring and fuseare ok. the problem then would be the blower motorbut after removal you could always check the motor by hooking it up to a 12 volt power source to see if it turns.
if your fan (blower motor) stopped working, more likely is the blower motor resistor, is locate it close to the blower motor. if the blower motor is ok, maybe your heater core is cloged.
disconnect the blower motor. if the fuse is ok then, the blower motor is bad. if the coolant leak is on the passenger floor, you may have a heater core leaking, although you may also smell a sweet odor from it.
It could be your blower switch, but more than likely it's a resistor that is usually a part of the blower assembly, and it operates the speeds. Doesn't cost much but can be tricky installing. If you had one or two speeds not working, initially, eventually all may stop. If fan stopped working and all speeds had been operating, then you may have a bad wire or blower motor. Also, check your manual for fuses, as there may be a compartment inside the vehicle as well as one under the hood.
Check fuses, there may be more than one fuse that controls the blower motor. If fuse is OK, then check relays (somewhere in a box). If relays and fuses are OK, then check (some dashboard dissassembly required) if voltage is getting to the blower motor. If there is voltage present, then suspect burnde blower motor, or if motor works only at full speed, then suspect a burned resistor in the blower motor assembly.
Check the fuse for your blower motor if it is OK the Blower Motor may be bad or you may have a loose wire to or from the it have it checked if fuse is good
There are 4 things to check out to pin point the problem: the switch it's self, the blower relay switch, resistor block, and the blower motor it's self. good luck
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