Thermostat stuck open. Drain and flush the system, replace the thermostat, fix the leak properly, and reinstall a 50/50 mix of antifreeze and distilled water.Also check rad cap as it may not be holding the pressure. Heater core may also need flushing if you put a sealer into the system
Answerit also may have plugged up your heater core (which is where the heat from radiator fluid is transfered to the air to make it hot) the best bet is to never ever use a sealant in your cooling system unless it is a dire emergency, cause it will always cost you more down the road. AnswerIf you run the engine for 15 minutes or so, grab the heater hose going to the heater core at the firewall, it should be hot and the one coming out should also be hot. If one is hot and one is not, then that's the spot. If they are both cold, then coolant is not getting to the heater core. Never use the sealant, it doesn't know the difference between an exterior leak and an interior passageway.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
Faulty thermostat. Plugged heater core. Temp blend door malfunction.
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
Probably your thermostat
check you antifreze level if it is low you wont have eat or if you get lots of fog your heater core is bad
The temperature blend door may be at fault.
The heater might blow cold air in a 2000 Silverado because the thermostat is sticking and not changing from cold to heat. The thermostat is usually located in a hose that leads from the radiator to the motor.
It is either your water pump or your thermostat
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.