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 systemAnswerit 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
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
Faulty thermostat. Plugged heater core. Temp blend door malfunction.
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 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.
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.
Your heater will blow cold air only.
It is either your water pump or your thermostat
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.
Is coolant up to level? Are heater control cables functioning to their full travel Thermostat may be defective and opening too soon. Heater maybe either "airbound" and need to be bled or may be plugged
why doesnt my heater work on my1985 BMW
Check the thermostat or heater core
The front expansion valve is clogged.
you need to replace your heater core
Leak in heater core. Replace core.
it wont blow heat itll blow cold air
replace front heater corefront and rear have independent heater cores
To blow a Heater hose means for example popping a balloon, the balloon blew up.in other words the hose leaks and is no longer useful.
May be a defective thermostat or heater core
flush the heater core in both directions with water