Pinpoint Test F : Insufficient, Erratic Or No Heat
WARNING: This page is about a different car, the 2018 Ford EcoSport. 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.
Possible Sources
- Low engine coolant level
- Plugged or partially plugged heater core
- Temperature door binding or stuck
- Temperature door actuator
Visual Inspection and Pre-checks
- Inspect for low engine coolant level.
- F1 CHECK FOR CORRECT ENGINE COOLANT LEVEL
- Ignition OFF.
- Check the engine coolant level.
Is the engine coolant at the correct level (hot/cold) as indicated on the engine coolant recovery reservoir?
Yes GO to F2 No DIAGNOSE the loss of coolant. Refer to the appropriate procedure. - F2 CHECK FOR COOLANT FLOW TO THE HEATER CORE
- Run the motor until it reaches normal operating temperature. Select the floor position on the control assembly. Set the temperature control to full warm and the blower to the lowest setting.
- Using a suitable temperature measuring device, check the heater core inlet hose to see if it is hot.
Is the heater core inlet hose hot?
Yes GO to F3 No DIAGNOSE the engine does not reach normal operating temperature. Refer to the appropriate procedure. - F3 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE
- Using a suitable temperature measuring device, measure the heater core outlet hose temperature.
Is the heater core outlet hose temperature similar to the inlet hose temperature (within approximately 6-17 deg.C [10-30 deg.F])?
Yes DIAGNOSE for a door actuator. GO to Pinpoint Test I No INSTALL a new heater core. REFER to: Heater Core .