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Check your electric fan operation and coolant level. If the fan is not working, temp will increase at idle and will decrease when air moves across the radiator while moving.

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โˆ™ 2006-04-28 15:48:22
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Q: Why would the temperature gauge on a 1998 Chevy Venture read normal or higher when idling or driving below 40kms but immediately drop to no reading at all when driving 40kms or more?
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