90 chevy lumina blink codes?

  • Thread starter Thread starter A T
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A T

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Where can I find the instructions on how to and code charts for a 1990 lumina sedan 3.1. The old paper clip test.
I drive down the street and when my car gets hot or warms up the service engine soon light comes on and stays on. Coolant fans don't come on when it gets hot. With AC turned on the fan to the passanger side comes on.
Car runs great but the light tells me something is wrong.

Thanks

Al T.
 
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