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The sensor can't read the temp if it's in an air bubble. And the Jeep will never, ever, burp itself.
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The easiest way to know if there is air in the system is a fluctuating temp gauge. Regardless if you're moving or not, with no rhyme or...
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The P0128 code is an easy diagnosis and I have personal experience with this code.
Cold start your Jeep and wrap your hand around the...