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check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose
flushing the radiator might not be enough to remove the water scales inside the small cavities...have it opened and cleaned thoroughly. In the location where I live they remove the top and the bottom part of the radiator and put a flat wire in and out into each of the flat tubes to dislodge the accumulated scales and dirt out. hope this helps
Had the same problem with my 97 dakota (3.9). I reversed flushed the heater core and the problem is solved... too much heat. Instead of flushing the heater core normally, reverse the intake and exit lines and flush. Whatever is lodged in the core's intake should be discharged.
switching the hoses is not recommended for trying to clear out a heater core because the coolant is meant to flow in one direction. you can try disconnecting the hoses from the heater core and flushing the core itself with a garden hose with low pressure in one direction for a few minutes and then switch and backflush the heater core. this is ok as long as the heater core is isolated from the engine cooling system. BUT if it is rusted pretty badly there is a chance it can develop a leak or blow out during the process so try it cautiously!! if the core is in-fact blocked you will have very little flow through the core and you will see what looks like rust coming out of the core, it may take quite a few times switching back and forth to clear it out. if it still remains blocked or if it starts leaking inside the car it will need to be replaced.