Obstructed Coolant Flow

WARNING: This page is about a different car, the 2009 Jeep Patriot and 2009 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

Possible locations or causes of obstructed coolant flow are as follows:

Low coolant level
Inoperative water pump
Inoperative thermostat
Pinched or kinked heater hoses
Improper heater hose routing
Plugged heater hoses or supply and return ports at the cooling system connections
Plugged heater core

If proper coolant flow through the cooling system is verified, and heater outlet air temperature is low, a mechanical problem may exist.