not developing enough vacuum while driving to keep the blend door open check your vacuum lines for leaks
A heater in a 2002 Honda Civic EX may blow cold air at idle or while stopped due to a few potential issues. One common cause is low coolant levels, which can prevent proper circulation through the heater core. Another possibility is a malfunctioning thermostat that might not be opening properly, leading to insufficient engine temperature. Additionally, a failing water pump or air trapped in the cooling system can also disrupt the flow of hot coolant to the heater core.
Sounds like your heater hose going to the heater core is stopped up some where along the way, Or your thermostat is broken. Otherwise if there is hot water getting to the core then it WILL blow warm air.
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.
heater on at idle and will not blow warm air. when moving it blows the warm air from the vents. what will cause this
If you know the fan motor is good but it will not work, first check the fuse. If the fuse is good, then it is either the fan motor switch or the resistor pack that is defective.
Needs a recharge
ONE OF THE HOSE WAS BROKEN AND NO ANTI-FREZEE
Probably need to add antifreeze. Check the Radiator not the overflow tank. If you are low on antifreeze it will not circulate through the heater core.
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
Your front blower motor has gone out. There is a front and a rear blower motor.
Defective blower motor?