I had the same problem with my 2000 Bug and it turned out to be battery issue. Because my car has been sitting in the parking lot for the winter battery was so weak that blower didn't work. And as soon as I replaced the battery it was working. That might help.
the floor pan could be sagging due to rot around the heater channel. common cause.
coolant level could be low not letting it circulate through the heater core, causing it to blow cold. Also, if the coolant level is low it will in turn overheat.
Your car's heater may be blowing cold air because there could be issues with the thermostat, low coolant levels, a malfunctioning heater core, or a problem with the blend door. It is recommended to have a professional mechanic inspect and diagnose the issue to determine the exact cause and necessary repairs.
Could be a bad thermostat or heater core
Could be a Faulty relay.
it could be a couple of things you could have a bad thermostat or a bad heater core
Your heater coil is bad.
There are several possible reasons why your heater may not be blowing hot air. It could be due to a malfunctioning thermostat, a clogged air filter, a problem with the heating element, or low levels of coolant in the system. It is recommended to have a professional inspect and diagnose the issue to determine the exact cause and necessary repairs.
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.
There are several possible reasons why your heater is only blowing cold air. It could be due to a malfunctioning thermostat, a problem with the heating element, a clogged air filter, or low levels of coolant in the system. It is recommended to have a professional inspect and diagnose the issue to determine the exact cause and necessary repairs.
there is a short somewhere in dash or heater, you need to fix that to stop fuses blowing
If the fan is not blowing, a fuse may be the cause. If there is just not warm air being blown by the fan, check your coolant level in your radiator. Low level of water and coolant will cause the heater to blow cooler air.