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If neither is working my first thought at the beginning of the season is to check the bypass valves to be sure they are in the "summer" position and not still in the "winter" position. If you aren't sure which is which slowly start removing the drain plug to see if water starts coming out. If there is no water in the tank the bypass valve is still in the "winter" position.
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2015 Bullet 220RBI
2019 Chevy Colorado extended cab V6 3.6 liter
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