Pinpoint Test J : Insufficient, Erratic Or No Heat: Notes
WARNING: This page is about a different car, the 2015 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Manual Climate Control System for schematic and connector information.
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.
Possible Sources
- Low engine coolant level
- Plugged or partially plugged heater core
- Temperature door binding or stuck
- Temperature door actuator
Visual Inspection and Diagnostic Pre-checks
- Inspect for low engine coolant level.