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If you are talking about a wall switch for the heater, check to see if the heater has its own internal thermostat or switch as this might be in the off position and not allow the heater to turn on. If you are talking about a switch on the heater itself, then yes in all probability the switch is not working.
Where is heater control switch
As heater motors age, they tend to draw more amps than they should. Yours is probably drawing too much amperage causing the switch to heat up. Remedy is to replace the heater motor and possibly the switch as the terminals get hot and oxidize.
Where is the heater relay switch on a 2005 MalibuRead more: Where_is_the_heater_relay_switc
you may have your switch on your heater control set to recirculate the inside air. it should be set for outside air recirculation
IT turns the heater on and off!
Use the manual provided with the heater. Each heater has somewhat different controls etc. If everything is already hooked up you may just have to turn a switch or two and turn up the thermostat.
The AC switch operates the AC compressor and should have no bearing on your heater function. If your heater is not working properly, you may have a weak thermostat.
It could be the high speed heater motor relay is stuck on or the switch itself is broken.
When you turn on the heater switch does nothing at all happen ? This coule be because the heater swith cable that goes to the water pipes and turns a switch to allow war water to flow has snapped, an easy fix is to find this switch (Should be around the back of the engine or on the bulkhead) and switch it so it is on allow hot water flow all the time when warmet weather comes switch it back to allow air con/ cold air.
The fuel cut off switch on this vehicle should be found below the heater. It is slightly raised from the floor by two screws.
A restricted/plugged heater core can do that. Try flushing the heater core.