Hi, for your heating problem make shure you dont have a air lock in the cooling system. often after opening the system, air gets loged in the highest spot in the cooling system wich is the heater core.
I just worked on a friends van withe the same symptoms and his problem was a bad circulation pump. His van has towing package, and rear heater. If you look under the coolant reservoir you will fid it. The coolant reaches the rear heater with no problem but the front heater core is higher then the engine and needs a BOOST to get coolant to circulate.
After replacing the pump the heat was back in full force.
Good luck.
Jocelyn
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