# Heater Problems Lexus SC400

**URL:** <https://community.cartalk.com/t/heater-problems-lexus-sc400/8058>\
**Category:** Maintenance/Repairs\
**Created:** [December 7, 2007, 12:33am UTC](https://community.cartalk.com/t/heater-problems-lexus-sc400/8058 "2007-12-07T00:33:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mark\_MacGaw](https://avatars.discourse-cdn.com/v4/letter/m/9de0a6/32.png) [@Mark\_MacGaw](https://community.cartalk.com/u/Mark_MacGaw)\
**Post date:** [December 7, 2007, 12:33am UTC](https://community.cartalk.com/t/heater-problems-lexus-sc400/8058/1 "2007-12-07T00:33:01Z")

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I have a 97 Lexus SC400 with 178K miles. My heat works fine and blows hot once the car wrams up. However, when I come to a stop,the vents blow cold air into the cabin. Once I start moving again, the heat returns in the vents. I’d love some advice as to what the problem may be. Anything to keep me from the dealership. Thanks, Mark

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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:** [December 7, 2007, 12:57am UTC](https://community.cartalk.com/t/heater-problems-lexus-sc400/8058/2 "2007-12-07T00:57:13Z")

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I would have the water pump checked or look for a vacuum problem. If you have low vacuum due to a leaking vacuum line it can cause the blend door to close when the vacuum goes too low.