Insufficient heating(Climate Control)

Diagnostic Procedure

1.Check the coolant level
2.Check the radiator cap
3. Check the engine coolant temperature (ECT) during normal operation with the HDS
4. 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
5.Do the driver's air mix control motor test - Refer to: Passenger's Air Mix Control Motor Test Air Mix Control Motor Test and the passenger's air mix control motor test - Refer to: Passenger's Air Mix Control Motor Test Air Mix Control Motor Test
6. Check the blower motor unit for obstructions
7. Check for air leaks around the ducts and vents

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