It doesn't really blow it out it just warms the cold air.
Low on coolant. Stuck open thermostat. Plugged heater core. Faulty temp blend door.
heater core possibly plugged and leaking
The front expansion valve is clogged.
Could be a bad thermostat.
Your heater will blow cold air only.
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
Low coolant in the system. Defective heater control valve. Clogged heater core.
engine not warm, low coolant, or stuck thermostat
you would have to see a mechanic about that problem
Assuming you want it to blow hot air, you may be low on coolant or have a stuck open thermostat or a plugged heater core or you have a faulty temperature blend door actuator.
Poor coolant circulation from a plugged up heater core. Try flushing the heater core and replacing the thermostat.
you need to replace your heater core
heater switch needs replaced
it wont blow heat itll blow cold air
the blown head gasket would make it over heat. but it wouldn't cause the heater to blow cold, it should actually blow hot if that is wat happened
The a/c - heater controller is out...........
Could be a number of reasons. Low coolant would be my first suspect, although most motors offered in a Sterling would shut down if the coolant got low. The heater core could be bad, there could be blockage in the heating system somewhere, you might have a bad or blocked heater hose.
Interior heat uses the engine heat. If the engine is still cold, the heater will blow cold. If the engine is warm and the heater is blowing cold, you have a problem with the heater. Check the water in the radiator and see if it is rusty. If it is rusty, change your coolant, thermostat, and hoses. Look at the heater hoses when someone steps down on the gas pedal. If a hose collapses, replace your heater hoses. Otherwise take it to a mechanic.
you are low on coolingliquid !
Possible causes are, low on coolant, thermostat stuck open, clogged heater core or vacuum scorce not getting to the heater control.
check thermostat, might be stuck closed.
Insufficient amount of coolant or thermostat not opening
I would change the thermostat first. If that dont work change water pump