Backflush heater core. New thermo and coolant. Be sure to burp system.
Might help but probably not. In my considerable experience, when scale and sludge blocks a heater only high pressure flushing has a chance of shifting it and a blocked heater is blocked - not blocked one day and ok the next.
More likely an airlock is preventing circulation, maybe the degassing system is blocked...
Try checking both heater pipes are hot when the heater is blowing cold - if they are the trouble could be with the climate control or a stuck air mixing flap or actuator unit that works sometimes...
SOURCE: 93 ford festiva heater only blows cold air.
The heater only blows HOT air when set on defrost or floor settings. If you have the lever set for vent, only cold air will come out. Check to make sure you set the controls to floor or defrost. This is standard for all Festiva's.
SOURCE: my heater is blowing cold air 2005 dodge grand caravan
In this order check the following:
Antifreeze level
thermostat
blend door
blend door motor...accordianman
SOURCE: heater problem 2005 grand caravan
check the coolant level, I had the same problem low coolant level.....no hot water to the the heater coil.
SOURCE: heater blowing cold air
squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.
SOURCE: heater blows cold air have replaced the thermostat
sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose
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