Most common would be your blower motor voltage regulator, this is the part that varies the voltage to the blower motor telling it to go faster or slower. It is located up under the dash on the passengers side and pretty easy to replace. You might also have to replace the blower motor and cover though, if the regulator has never been replaced before you might have to do this. The old style regulator is not available anymore.
it could be a couple of things you could have a bad thermostat or a bad heater core
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
Check the following items............... 1. A/C heater controller. 2. A/C heater controller doors.
Isn't a heater supposed to blow warm air?
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
No one knows if:The heater is NOT blowing - or blowing on high speed only, or... The heater IS blowing, but the air is NOT hotEither way, the "Related Questions" below will get you started
it is a heater. heat. it blows heat. warm air
Your heater may be blowing cold air because there could be a problem with the thermostat, a lack of fuel or a clogged air filter. It is recommended to check these components and consult a professional if needed.
If your heater is a heat pump , then yes.
faulty control valve on heater or air in the lines
Low coolant and a clogged heater core are possibilities.
Maybe its broken. Or maybe you pressed the AIR CONDITIONING