Pinpoint Test F : Insufficient, Erratic Or No Heat: Notes
WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Normal Operation and Fault Conditions
When the engine is at operating temperature hot coolant flows from the electric motor through the heater core and back to the electric motor. Correct coolant temperatures are critical for good heater performance.
Possible Sources
- Wiring, terminals or connectors
- Temperature door actuator(s)
- Heater core
Visual Inspection and Diagnostic Pre-checks
- Inspect for low engine coolant level.