Vehicle Applications: 2002 Highlander 3.0L; 2003-’04 Highlander 2.4L; 2004-’06 Highlander 3.3L
Customer Concern: Intermittent heater operation; the heater will go from hot to cold on its own.
Potential Causes: Loose control knob potentiometer. A loose control knob nut allowed the ribbon to be stretched, causing a poor connection.
1. Inspect the temperature control knob for a loose mounting nut and damaged wire ribbon.
2. Inspect the wire ribbon attached to the temperature control knob to see if it has come loose.
Tech Tips: Some technicians have been able to repair the damaged wire ribbon and reassemble the control panel to avoid complete control panel replacement.
Courtesy of Identifix.