Replaced my leaking water pump and now I hear a sound like air or running through the heater core in cab especially when let off gas - radiator is full what could be causing this?
- Air trapped in the cooling system.
- Low coolant level (check again especially at radiator).
- Clogged or faulty heater core.
- Faulty thermostat
- Faulty water pump (unlikely if just replaced - but could be due to faulty part or improper installation).
