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well hmmmm tough 1st and farmost check make sure ur fans ar running to cool it 2nd u checked water pump but doesnt mean its good the coil inside could be shot change it let me know

2006-08-16 08:13:09
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Q: 91 Chevrolet S10 truck and have changed thermostat tuned it up checked water pump and still overheats and service engine soon light comes on?
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