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Q: do you have to have a gasket for a thermostat if has an o-ring on it? on 1998 Chevrolet Venture

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for a 1998 venture
(1) Answer
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Most commonly you would not have a gasket when the thermostat has an o-ring. However, as with any rule there are exceptions. Your best bet is to look and see if there is a gasket or not when you take the old thermostat out. You local parts supplier will also be of help.