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Q: how to fix po128 code
on this van on 2002 GMC Safari

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I am trying to determine how to diagnose a PO128 error code on a 2002 GMC Safari. I would appreciate any info anyone might have on this
Here's the obd code: http://www.obd-codes.com/p0128
I would suggest if the coolant level and strength are good, it is probably a bad thermostat that needs replaced.
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