This Jeep had a new thermostat installed 3 months ago, now it won't warm up and has a check engine light. Today we fix the problem with a new OEM thermostat. I show you how to diagnose this and some tips and tricks to avoid common problems.

Coolant filler tool: https://amzn.to/4btiguI
To see all of the tools that I use and recommend, visit the Tool Demos store: https://www.amazon.com/shop/tooldemos
As an associate, I earn from purchases.

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