No heat

If you are refering to is the power then you can just remove the fuse. If the heater core is leaking, then you can bypass the heater core. Disconnect the lines going into the heater core and using a connection connect them together so the cooland still circulates.
Check out, how it works
then click on, cooling system
then click on, heater questions

how it works is on the left of the screen
there will be questions there that refer to heater core leaks

Have you had the blend door checked? Also, with the engine hot, running, and the heater on high, do both heater core hoses get hot?

Let me know.
Joe

Blend door fault most likely controls or actuator Atuo or Mnaual Air?

Check the heater core if its clogged-up if not could be an air mix/blend/mode door problem and vacuum/actuators-Also if it has a heater control valve check that too.

Hi:
Check the coolant level. It may be low. If it is full, let me know and we'll go from there.

Joe

Warm? That may not be enough. Compare the temp with the upper radiator hose.

Check the blend door. Make sure the heater core hoses are getting hot. If only one does, flush the heater core.

Possible causes are thermostat stuck open, low coolant level and plugged heater core. The last one I want to address is the blend door motor. It is inside the car behind the radio and it fails very often. It is an electric motor that moves the mode door from cold to heat. A shop can check it for you to verify. If you hear clicking noises when you change from cold to hot, that most likely is the issue.

Roy

Check if the heater core is clogged-up and also the heater control valve if its functioning properly