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Hello, was the heat not working before or after replacing these parts?
Does this vehicle use a boost pump? A lot of these I have seen use a boost pump to supply enough coolant to the heater itself.
Ok let me know if that works for you.
It's possible the auxiliary heater core is restricted and needs to be flushed.
Bleeding the system must not have helped?
Great so a lift pump did fix it. If you feel I helped at all please rate my service so I receive credit for assisting you.