Low coolant, stuck thermostat, blocked hoses.
No, a clogged heater core will not make it overheat. A leaking heater core will.
Your cooling system is empty of coolant and you must have a large leak somewhere.
how do i change my blower motor on my 2007 malibu
It sounds like you have a short somewhere.
check heater fan to see if it is working.
In the a/c heater core housing under dash, pass. side
You will have only cold air coming thru your heater ducts if your core is defective.
It may or may not have a block heater. If it does then the power cord will be located near the battery behind the grill.
If you feel no air blowing at all (when you are not moving) then your fan is not blowing. If it is blowing air, and it is cold, when the heater is on, then most probably your heater core is leaking, or is clogged. These are easily replaceable and go bad all the time in older cars.
Under the passenger side dash. It's awkward to get to, but it's there.
Will water in your 2002 Chevrolet Malibu cooling system will result in no heat. The water level is too low to reach the heater core.
No. The problem is most likely your heater core. Ask a mechanic.