check you antifreze level if it is low you wont have eat or if you get lots of fog your heater core is bad
Faulty thermostat. Plugged heater core. Temp blend door malfunction.
The blower on the back heater may need to be replaced on the 2000 Ford Winstar.
you may not have the heater water hoses plugged in
probably the heater core is clogged
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.
Leak in heater core. Replace core.
The front expansion valve is clogged.
heater core possibly plugged and leaking
It doesn't really blow it out it just warms the cold air.
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
No! Thermostat.