Why does my heat get cold when I stop my car?
Why does my heat get cold when I stop my car? You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. Why does my car only heat up when I'm on the highway? If the heater only works when you are driving down the highway, the most likely problem is that your cooling system is low on coolant. This would indicate that you cooling system has a leak. Filling the system with coolant will restore the heater to its proper...