One problem related to defogger has been reported for the 2001 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Highlander based on all problems reported for the 2001 Highlander.
The air conditioner only works when you move the dial around. Sometimes it doesn't work at all and only the heat comes on even when you just have the fan on.