I did a motor swap in my 330 back at the start of summer. Now as mornings are colder I found the car isn't getting hot water to the heater core. Worked before, I installed a new water pump/thermostat during the swap and the engine temp is fine. Tried flushing all hoses and heater core which were fine, installed a new heater valve as well.
Can anybody local maybe help diagnose the problem? At my wits end and about ready to just ditch the car.
Craig, just saw this. Did you figure it out? When you did the WP replacement. What brand is it? I have experienced the impeller was mounted backwards from the factory. Check that and report back.
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