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Old 10-14-2018, 10:31 AM
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Another CEL for me

This time P0128

I drove 50 miles to my house and once the engine was cool, I checked the coolant. Radiator is full, but reserve is way below lowest indicator.

Headed to the dealer to get coolant (OAT) for my jeep once it opens.

Just wondering if reserve will trigger the mil/cel if it’s low?




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Old 10-14-2018, 03:09 PM   #2
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Sounds like your thermostat was stuck open. I think the reserve tank being low is a coincidence.

May want to pull the reserve tank off and make sure it's not cracked. It's not uncommon to have one crack. It pulls straight up.

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Old 10-15-2018, 12:36 PM
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I filled the reservoir yesterday and cleared the code. Drove over 100 miles w/ several stops and hasn't replicated.
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