What is your question?
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What is your question?
Have a 90 model S10 with the 4.3L engine and want to flush the whole coolant system including the block and heater core thanks
What makes this problem better or worse?
Na
How long has your 1990 Chevrolet S10 had this problem?
A while
Install new thermostat and *antifreeze* - being sure enough is added to protect coolant from freezing in cold temperatures.