Two problems related to defogger have been reported for the 2003 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota Highlander based on all problems reported for the 2003 Highlander.
Manual heater control dial lost function to control temperature. Heater only blows cold air. Recommendation was to replace heater control panel at cost of approximately $600 for the part alone. Labor addition charge.
2003 Toyota Highlander 4. 0 heater has gone out in this vehicle and only the a/c now works this happened right after the purchase of this vehicle and the cost to fix this is very high and should be dealt with per Toyota since it seems alot of others are also having the problem due to a faulty knob becoming loose and breaking a tiny wire.