2005 Dodge Caravan heater issue. One day the heater is working normal, the next day, it's blowing out cold air....thermostat or heater core..will flushing system help determine problem?
Cars & Trucks - Dodge
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Answers & Comments
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...