# 2003 Saturn L - AC seems to do its own thing

**URL:** <https://community.cartalk.com/t/2003-saturn-l-ac-seems-to-do-its-own-thing/195878>\
**Category:** Maintenance/Repairs\
**Tags:** saturn\
**Created:** [August 20, 2024, 5:06pm UTC](https://community.cartalk.com/t/2003-saturn-l-ac-seems-to-do-its-own-thing/195878 "2024-08-20T17:06:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![marten](https://avatars.discourse-cdn.com/v4/letter/m/4af34b/32.png) [@marten](https://community.cartalk.com/u/marten)\
**Post date:** [August 20, 2024, 5:06pm UTC](https://community.cartalk.com/t/2003-saturn-l-ac-seems-to-do-its-own-thing/195878/1 "2024-08-20T17:06:44Z")

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ac/heater comes on by itself with no prompting from driver or passengers.  
What could cause this? Is it the control module or a computer problem?

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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:** [August 20, 2024, 5:41pm UTC](https://community.cartalk.com/t/2003-saturn-l-ac-seems-to-do-its-own-thing/195878/2 "2024-08-20T17:41:54Z")

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The BCM controls the HVAC system functions.

 ![2008-09-17_170452_SHOT1017](https://global.discourse-cdn.com/cartalk/original/3X/f/3/f34aefb67c5a17552c0c6a3dbb6ce2fa43dc4a64.jpeg)

Tester