[Mrbizness1]

What engine is in the car?
A few items to check.
coolant level in the overflow bottle, there are two heater hoses that go through the firewall into the heater core. After the motor has been running a while they should both be the same temperature. If one is much hotter than the other that means the core is partially blocked. If it is blocked use a razor blade to slit the ends and peel away the hoses. Use a hose to back flush the core. Remove the hoses carefully, you don't want to put to much stress on the core. After you do this you will need to run the motor with the radiator cap off and the car facing slightly uphill to get the air out of the cooling system.