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2003 chevy trailblazer_lt
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Discussion Starter · #1 ·
Hello, I recently acquired a 2003 Trailblazer LS 4x4 with 77K miles.

How can I tell if radiator hoses really need replacing?

After reading some other posts, do I REALLY need to disconnect the battery? I'm concerned that the "tuning" over time that the OBC has done to the mixture, etc. will be reset to factory defaults when the battery is re-connected, and the engine won't run as smoothly as it does now.
 
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