Feel the heater hoses. They should be too hot to hold onto for very long. The cold lower radiator hose just means the radiator is doing its job. If the heater hoses are cool, suspect a plugged heater core. Usually you can flush it with a garden hose. If the hoses are hot, suspect a problem with an actuator on the heater box or with the controller.
Tuesday, February 8th, 2011 AT 11:53 PM