Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Welcome to JustAnswer!!!
Are you saying that coolant isn't flowing into the heater core? If you rev the engine does the flow increase? Have you ever replaced the water pump?
If it's full of coolant and it's not flowing then you have a circulation issue and I would remove the lines and see what your blockage is..
The heater inlet coming from the engine.. If you will notice the chart the heater core gets it's coolant flow from the engine and the water pump pushes it thru the engine to the heater core.. If the coolant isn't flowing thru the engine I would suspect a bad water pump or clogged engine coolant passenges..
Since you have had this issue ever since you replaced the engine I would remove the radiator lines to the engine and back flow the entire engine with a garden hose and make sure the engine isn't clogged.. It should flow thru the engine will not restrictions.. Also remove the thermostat and flush the engine with a garden hose... Run the hose in the engine and fire it u and see if it's flowing. If you have it all flushed out and it still will not flow then I would remove the water pump and verify it's the correct one and not turning backwards...
You are very welcome.
Once you get it to flow the heater will work fine