# 2000 Silverado heater not working

**URL:** <https://community.cartalk.com/t/2000-silverado-heater-not-working/152933>\
**Category:** Maintenance/Repairs\
**Created:** [November 17, 2019, 4:07am UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933 "2019-11-17T04:07:40Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![sstark93\_159897](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@sstark93\_159897](https://community.cartalk.com/u/sstark93_159897)\
**Post date:** [November 17, 2019, 4:07am UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/1 "2019-11-17T04:07:40Z")

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My heater in my truck is not working. It’s a 2000 Silverado 5.3 Replaced the thermostat, flushed out the heater core, and checked to make sure the actuator under the passenger dash is moving when I switch from cold to hot. It just blows cold/ neutral air but never hot

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**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\
**Post date:** [November 17, 2019, 10:42am UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/2 "2019-11-17T10:42:40Z")

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Are both heater hoses from the heater core equally hot ? within a few degrees.

A plugged heater core can still flow quite a bit of water through it.

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**Author:** ![Scrapyard-John](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@Scrapyard-John](https://community.cartalk.com/u/Scrapyard-John)\
**Post date:** [November 17, 2019, 3:41pm UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/3 "2019-11-17T15:41:12Z")

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If possible, you might remove the actuator and see if you can manually move the blend door and then see if you have heat. There are 3 or 4 actuators under there (some easier to get to than others), so make sure you are looking at the correct one.

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**Author:** ![sstark93\_159897](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@sstark93\_159897](https://community.cartalk.com/u/sstark93_159897)\
**Post date:** [November 17, 2019, 6:21pm UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/4 "2019-11-17T18:21:14Z")

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No one hose is hot and one is not even warm

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [November 17, 2019, 11:35pm UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/5 "2019-11-17T23:35:32Z")

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sounds like a classic case of plugged heater core

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**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\
**Post date:** [November 18, 2019, 1:01pm UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/6 "2019-11-18T13:01:43Z")

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> [@sstark93\_159897](#):
>
> No one hose is hot and one is not even warm

My money is on a plugged heater core.

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**Author:** ![sstark93\_159897](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@sstark93\_159897](https://community.cartalk.com/u/sstark93_159897)\
**Post date:** [November 18, 2019, 3:39pm UTC](https://community.cartalk.com/t/2000-silverado-heater-not-working/152933/7 "2019-11-18T15:39:15Z")

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I reverse flushed it, is there any other way to do it?