# 2000 Mercedes-Benz M-Class - HVAC Occasionally Blows Only Hot

**URL:** <https://community.cartalk.com/t/2000-mercedes-benz-m-class-hvac-occasionally-blows-only-hot/145078>\
**Category:** Maintenance/Repairs\
**Created:** [July 23, 2019, 3:33pm UTC](https://community.cartalk.com/t/2000-mercedes-benz-m-class-hvac-occasionally-blows-only-hot/145078 "2019-07-23T15:33:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MiracleAgabi](https://avatars.discourse-cdn.com/v4/letter/m/3bc359/32.png) [@MiracleAgabi](https://community.cartalk.com/u/MiracleAgabi)\
**Post date:** [July 23, 2019, 3:33pm UTC](https://community.cartalk.com/t/2000-mercedes-benz-m-class-hvac-occasionally-blows-only-hot/145078/1 "2019-07-23T15:33:28Z")

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The Car’s (2000 ML430) HVAC only randomly blows heat air, and won’t blow cold air after turning the climate control nob to cold air. I’ve replaced the air blend motor actuator and it’s still randomly changing from blowing cold air to hot air, or just blows hot air . Any help would be great. Thanks.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [July 23, 2019, 6:22pm UTC](https://community.cartalk.com/t/2000-mercedes-benz-m-class-hvac-occasionally-blows-only-hot/145078/2 "2019-07-23T18:22:48Z")

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Could be a bad climate control computer.