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Likely the heater control valve for cabin air is failing but could be electrical switch/circuit that controls valve. Check control voltage at valve to isolate.
heater cores plug up much more than they leak. when it is plugged no warming coolant has a chance to heat it up. check for that. if one hose is warm and the other cold, that is a sign.
Check these three possibilities: One, car has a bad thermostat. Two: Car has a bad heater control valve and three: Car has a vac leak under the dash that controls the heater Flap Valve. If this flapper isn't closed completely, cool outside air mixes with the warm inside (recirculating) air and cause a lukewarm air mixture at the vents.
just because the gauge seems normal doesnt mean the thermostat is good, its 5 years old,and may be opening to soon, i would start by having the t-stat replaced and while thats being done have the cooling system flushed including a flush off the heatercore. i ve worked on a couple of these vans with heating problems, most were low on coolant due to a slow waterpup leak, the others with half plugged heatercores, due to the lack of coolant flushes. hope this helps.
try back flushing the heatercore and replace thermostant see if that takes care of problem it should, hope this helps, also make sure coolant is full, but never open radiator cap with a hot engine.
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