Heater blows cold while in idle but hot while running. I’ve read about air in the cooling system as a common cause for Nissan Frontiers (and Titans). It has a pressurized coolant reserve tank and no bleeder valve. Is there a good way to bleed the system of air?
I’ve squeezed the upper coolant line and release one air bubble, but it did not fully fix the issue. Any directions would be helpful!
2012 Nissan Frontier SE. Coolant system drained and filled 6 months ago.