# Sunbird running hot after replacing thermostat

**URL:** <https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580>\
**Category:** Maintenance/Repairs\
**Tags:** pontiac, sunbird\
**Created:** [December 31, 2009, 5:45pm UTC](https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580 "2009-12-31T17:45:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![tlduker](https://avatars.discourse-cdn.com/v4/letter/t/3bc359/32.png) [@tlduker](https://community.cartalk.com/u/tlduker)\
**Post date:** [December 31, 2009, 5:45pm UTC](https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580/1 "2009-12-31T17:45:07Z")

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I have a 92’ Pontiac Sunbird. I was away from home and some family members were driving it. It was reported to me that it was running hot. When I returned, I replaced the thermostat, it continues to run hot, with no heat blowing in the car. What could be the 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:** [December 31, 2009, 5:52pm UTC](https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580/2 "2009-12-31T17:52:37Z")

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The problem might be with a blown head gasket.

Tester

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [December 31, 2009, 5:53pm UTC](https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580/3 "2009-12-31T17:53:46Z")

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Failed water pump (very rare) blown head gasket, (coolant is constantly going into overflow tank) failed electric cooling fan…fan should come on when gauge reads 'hot" or ANYTIME the A/C is on…

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**Author:** ![tlduker](https://avatars.discourse-cdn.com/v4/letter/t/3bc359/32.png) [@tlduker](https://community.cartalk.com/u/tlduker)\
**Post date:** [December 31, 2009, 6:04pm UTC](https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580/4 "2009-12-31T18:04:23Z")

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Thanks Tester and Caddyman. I’ll have to look into these suggestions a little more.

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [January 1, 2010, 12:38am UTC](https://community.cartalk.com/t/sunbird-running-hot-after-replacing-thermostat/41580/5 "2010-01-01T00:38:35Z")

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Could be air trapped in the system.  
Is there a bleed screw?