If you have your system on heat and you are only getting hot air from the front vents and not the rear you might have a bad actuator motor. There are two different plenum doors on your vehicle. One opens and closes for heat to the front passenger area. The other one opens and closes for the rear passenger area. There's another answer out there for this rear A/C problem advising owners that the rear control knob on the front dash is bad and replacement is 'a snap'... Can anyone comment on these two trouble-shooting tips?
The blower on the back heater may need to be replaced on the 2000 Ford Winstar.
When you have the heater on, does it just blow any air at all? or no air?
For a Windstar, a common problem is a failed temperature blend door motor - actuator. See "Related Questions" below
Because your thermostat is probably stuck open
Leak in heater core. Replace core.
The front expansion valve is clogged.
heater core possibly plugged and leaking
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
It doesn't really blow it out it just warms the cold air.
The thermostat could be stuck open.
Low coolant. If the coolant is low then the heater core is not able to transfer heat in to the car.
if it doesn't heat your heater core is most likely clogged and if it doesn't blow at all then the blower is messed up.
Poor coolant circulation from a plugged up heater core. Try flushing the heater core and replacing the thermostat.
it has a partially clogged heater core.replace the heater core
Low coolant in the system. Defective heater control valve. Clogged heater core.
The heater does not blow air because it emits infrared rays that have heat molecules within them, thus releasing heat, not blowing it. A heater does not blow air becasue there is no moving air source within the heater. The heater emits infrered rays that cause heat to slowly flow out of the heater.
Could be a bad thermostat.
either need a blend door accuator or a heater box
Your heater will blow cold air only.
You need to replace the heater coil !
Could be a number of reasons for this condition. I would check the coolant level. A low coolant level could cause your heater to blow cold air when the engine is warm. Is the engine warm? If the engine is fluctuating temp it could be a faulty thermostat. Hope this helps.
A restricted/plugged heater core can do that. Try flushing the heater core.
Possible causes are, low on coolant, thermostat stuck open, clogged heater core or vacuum scorce not getting to the heater control.