Pinpoint Test G : Insufficient, Erratic, Or No Heat: Notes
WARNING: This page is about a different car, the 2018 Ford Focus. 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 engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance.
Visual Inspection and Diagnostic Pre-checks
- Inspect for low engine coolant level.
Possible Sources
- Low engine coolant level
- Heater hoses kinked
- Plugged or partially plugged heater core
- Temperature door(s) binding or stuck
- Temperature door actuator(s)