# Toyota Highlander Heater issue

**URL:** <https://community.cartalk.com/t/toyota-highlander-heater-issue/7380>\
**Category:** Maintenance/Repairs\
**Tags:** heating, toyota, highlander\
**Created:** [November 17, 2007, 6:38pm UTC](https://community.cartalk.com/t/toyota-highlander-heater-issue/7380 "2007-11-17T18:38:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![beckster](https://avatars.discourse-cdn.com/v4/letter/b/e495f1/32.png) [@beckster](https://community.cartalk.com/u/beckster)\
**Post date:** [November 17, 2007, 6:38pm UTC](https://community.cartalk.com/t/toyota-highlander-heater-issue/7380/1 "2007-11-17T18:38:27Z")

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I have a 2002 Highlander V6 AWd with 80,000 miles on it. This summer there were a couple occasions when th a/c would blast out hot air and then switch back to cold if I played with the temp adjustment knob. Now, in the winter, it is doing the exact opposite, but much more frequently. Sometimes if I even hit a bump in the road it will switch to cold. So far, I have been able to coax the correct temp of air back. Part B of this is that there is no mid range heat - it is either fry your eyebrows off hot or Canadian winter cold. Anyone have any similar experience with this, any ideas, suggestions or resources?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [November 17, 2007, 8:59pm UTC](https://community.cartalk.com/t/toyota-highlander-heater-issue/7380/2 "2007-11-17T20:59:44Z")

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It sounds like there’s a problem with the blend door control.

The blend door is what controls whether you want heated or cold air, or a combination of both. And this door can be controlled either by a vacuum motor or an electrical stepper motor. Sometimes removal of the glovebox will gain access to the blend door motor.

Tester