Why are the hoses to the heater core cold?
Why are the hoses to the heater core cold? But it sounds like a bunged up heater core…..or a massive air pocket blocking coolant flow into the heater core. With the engine cold and you’ve got reasonable access to safely disconnect your heater core hoses one at a time, disconnect one or the other and have a friend start the engine. What should I do if my car heater is blowing cold air? If after the engine heats up and your heater isn’t blowing hot air at an idle but is blowing hot air at higher engine speeds, the first...