# 2003 Buick LeSabre - Overheats

**URL:** <https://community.cartalk.com/t/2003-buick-lesabre-overheats/161108>\
**Category:** Maintenance/Repairs\
**Tags:** buick\
**Created:** [March 15, 2020, 10:45pm UTC](https://community.cartalk.com/t/2003-buick-lesabre-overheats/161108 "2020-03-15T22:45:36Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![MichaelGreen](https://avatars.discourse-cdn.com/v4/letter/m/e56c9b/32.png) [@MichaelGreen](https://community.cartalk.com/u/MichaelGreen)\
**Post date:** [March 15, 2020, 10:45pm UTC](https://community.cartalk.com/t/2003-buick-lesabre-overheats/161108/1 "2020-03-15T22:45:36Z")

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My 2003 buick lesabre is overheating. I have a new radiator, new thermostat, 50/50 coolant. Its still running hot

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [March 16, 2020, 2:21am UTC](https://community.cartalk.com/t/2003-buick-lesabre-overheats/161108/2 "2020-03-16T02:21:44Z")

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Off the top of my head, you might have air trapped in the cooling system. Run it for a while with the heater on high and check the coolant level.

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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:** [March 16, 2020, 2:41pm UTC](https://community.cartalk.com/t/2003-buick-lesabre-overheats/161108/3 "2020-03-16T14:41:53Z")

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Check the color of the transmission fluid,

If it’s dark or black,

![image](https://global.discourse-cdn.com/cartalk/original/3X/f/c/fc4b0177afaea34ea28515cef49491d1d3b12c18.png)

the transmission is running hot.

And if the transmission runs hot, it can cause the engine to overheat.

Tester

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**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\
**Post date:** [March 17, 2020, 4:53am UTC](https://community.cartalk.com/t/2003-buick-lesabre-overheats/161108/4 "2020-03-17T04:53:29Z")

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Are your radiator fans running when it is overheating, and is it overheating in heavy traffic, at idle,or over 50 mph?