# Thermostats

**URL:** <https://community.cartalk.com/t/thermostats/25173>\
**Category:** Maintenance/Repairs\
**Tags:** overheating\
**Created:** [January 19, 2009, 4:47pm UTC](https://community.cartalk.com/t/thermostats/25173 "2009-01-19T16:47:33Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![drazlou](https://avatars.discourse-cdn.com/v4/letter/d/9de0a6/32.png) [@drazlou](https://community.cartalk.com/u/drazlou)\
**Post date:** [January 19, 2009, 4:47pm UTC](https://community.cartalk.com/t/thermostats/25173/1 "2009-01-19T16:47:33Z")

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Chevy truck w/ 5.0 V8 doesn’t warm up. Replaced thermostat which was stuck open with new 185 deg unit. Truck overheats now. Checked new thermo in boiling water, it opens. Original thermostat had hole drilled through it. Any thoughts?

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [January 19, 2009, 5:37pm UTC](https://community.cartalk.com/t/thermostats/25173/2 "2009-01-19T17:37:01Z")

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I usually replace the radiator cap and the thermostat at the same time. If the radiator cap is not holding pressure the radiator will boil over.

Ed B.

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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:** [January 19, 2009, 6:21pm UTC](https://community.cartalk.com/t/thermostats/25173/3 "2009-01-19T18:21:09Z")

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Make sure the new one was not installed upside-down.

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**Author:** ![pleasedodgevan](https://avatars.discourse-cdn.com/v4/letter/p/51bf81/32.png) [@pleasedodgevan](https://community.cartalk.com/u/pleasedodgevan)\
**Post date:** [January 19, 2009, 6:24pm UTC](https://community.cartalk.com/t/thermostats/25173/4 "2009-01-19T18:24:07Z")

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You have to say what year.

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**Author:** ![ken\_green](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/ken_green/32/816_2.png) [@ken\_green](https://community.cartalk.com/u/ken_green)\
**Post date:** [January 19, 2009, 6:52pm UTC](https://community.cartalk.com/t/thermostats/25173/5 "2009-01-19T18:52:06Z")

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And you could have circulation issues with a working 'stat. Check radiator flow and water pump.