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Q: 2004 chevy trailblazer i was told to replace the thermostat, then dealer said no on 2004 Chevrolet Trailblazer

the dealer said it may just need oil changed or more coolant that service engine does not mean to replace the thermostat they said it takes a 10,000 dollar machine to read it properly not the one at the auto parts store.

???? any ideas on this issue.
Mountain man1
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The reading says service engine soon.?
I just had oil changed about 2 weeks ago dealer says the reset should have been done when oil was changed it was not?????
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That does not sound like a maintenance reminder light....It may need to have the system tested for faults related to emissions etc.
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