# Heater controls, 2000 S-10

**URL:** <https://community.cartalk.com/t/heater-controls-2000-s-10/21458>\
**Category:** Maintenance/Repairs\
**Created:** [October 31, 2008, 6:54pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458 "2008-10-31T18:54:28Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![old\_gunny](https://avatars.discourse-cdn.com/v4/letter/o/d78d45/32.png) [@old\_gunny](https://community.cartalk.com/u/old_gunny)\
**Post date:** [October 31, 2008, 6:54pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458/1 "2008-10-31T18:54:28Z")

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How can I troubleshoot the vacumm controls of the heater/ac? turn on the heater it comes out the defroster, changed the vacumm control unit

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**Author:** ![Beadsandbeads](https://avatars.discourse-cdn.com/v4/letter/b/c57346/32.png) [@Beadsandbeads](https://community.cartalk.com/u/Beadsandbeads)\
**Post date:** [October 31, 2008, 7:47pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458/2 "2008-10-31T19:47:57Z")

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Is this old-fashioned knobs and levers or an electronic control? Did you change the control in the dash or a vacuum motor on in the ducts? Do you have vacuum to the control? If there is no vacuum, these systems default to defrost flow so you can see where you are going (even if your feet are freezing).

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [October 31, 2008, 8:01pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458/3 "2008-10-31T20:01:27Z")

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Start at the source, check the vacuum accumulator and check valve.

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [October 31, 2008, 11:25pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458/4 "2008-10-31T23:25:26Z")

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And the vacuum lines.

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**Author:** ![old\_gunny](https://avatars.discourse-cdn.com/v4/letter/o/d78d45/32.png) [@old\_gunny](https://community.cartalk.com/u/old_gunny)\
**Post date:** [November 1, 2008, 8:00pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458/5 "2008-11-01T20:00:20Z")

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everything works except for the heater. I have checked all vacuum motors, and I have vacuum at the control. Could the diverter arm inside the duct be broken?

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**Author:** ![eulessdave](https://avatars.discourse-cdn.com/v4/letter/e/e8c25b/32.png) [@eulessdave](https://community.cartalk.com/u/eulessdave)\
**Post date:** [November 30, 2009, 4:41pm UTC](https://community.cartalk.com/t/heater-controls-2000-s-10/21458/6 "2009-11-30T16:41:26Z")

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Do a web search on Heater Treater - it’s a fix for broken diverter doors.