# 2003 Toyota Highlander - Heater switch

**URL:** <https://community.cartalk.com/t/2003-toyota-highlander-heater-switch/160301>\
**Category:** Maintenance/Repairs\
**Tags:** toyota\
**Created:** [March 3, 2020, 11:16pm UTC](https://community.cartalk.com/t/2003-toyota-highlander-heater-switch/160301 "2020-03-03T23:16:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![james32](https://avatars.discourse-cdn.com/v4/letter/j/d6d6ee/32.png) [@james32](https://community.cartalk.com/u/james32)\
**Post date:** [March 3, 2020, 11:16pm UTC](https://community.cartalk.com/t/2003-toyota-highlander-heater-switch/160301/1 "2020-03-03T23:16:34Z")

</div>

trouble with heater/ac knob. Whilein A/C mode will switch to heat and via/versa

---

<div class="post-metadata">

**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [March 4, 2020, 12:04am UTC](https://community.cartalk.com/t/2003-toyota-highlander-heater-switch/160301/2 "2020-03-04T00:04:40Z")

</div>

My top-of-the-head guess would be a vacuum leak affecting the actuator. A good mechanic could diagnose it for sure.