Insufficient Heating
Insufficient heating
Check the coolant level Testing and Inspection
Check the radiator cap Testing and Inspection
Check the coolant temperature during normal operation
Check the heater core inlet hose temperature:
If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, or a damaged or leaking water pump
If it is HOT, check for restrictions in the heater core. Back flush or replace the heater core
Do the driver's air mix control motor test Driver's Air Mix Control Motor Test and passenger's air mix control motor test Passenger's Air Mix Control Motor Test
Check the blower motor unit for obstructions
Check for air leaks around the ducts and vents
Also Check for
Climate control DTCs
Also Check for
Damaged cylinder head gasket