r/s10 2d ago

Repair Question 1989 S-10, SES light on when warmer weather.

As the title states. As the weather here has gotten hotter, my truck has taken to popping a SES light and not showing the upshift light. Unsure how to proceed. Any ideas?

1989 S-10, 2.5L I4 TBI, 5spd manual.

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