# 2002 GMC Sonoma won't heat up past 150 degrees

**URL:** <https://community.cartalk.com/t/2002-gmc-sonoma-wont-heat-up-past-150-degrees/127406>\
**Category:** Maintenance/Repairs\
**Tags:** sonoma, gmc\
**Created:** [October 23, 2018, 1:54pm UTC](https://community.cartalk.com/t/2002-gmc-sonoma-wont-heat-up-past-150-degrees/127406 "2018-10-23T13:54:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![paulivey](https://avatars.discourse-cdn.com/v4/letter/p/dfb087/32.png) [@paulivey](https://community.cartalk.com/u/paulivey)\
**Post date:** [October 23, 2018, 1:54pm UTC](https://community.cartalk.com/t/2002-gmc-sonoma-wont-heat-up-past-150-degrees/127406/1 "2018-10-23T13:54:15Z")

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I had a radiator split last summer. changed it out and now it won’t heat up past 150 degrees. i cleaned heater coil, changed 3 thermostats. 2 radiators and heat temp console. plus temp sensor.

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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:** [October 23, 2018, 2:02pm UTC](https://community.cartalk.com/t/2002-gmc-sonoma-wont-heat-up-past-150-degrees/127406/2 "2018-10-23T14:02:35Z")

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Thermostat installed backwards, maybe? Air bubble that just can’t get out?

How are you measuring the 150 degrees? With the car’s gauge or sender? Or something else? I wouldn’t believe the car’s gauge or sender unless I’ve verified it with another method.