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How do you tell if temp sending unit is bad?


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Typically if your gauge doesn't move or stays cold when engine is warm or hot when the engine is first started then you have a bad sending unit. There are circumstances where a gauge may fluctuate from hot to cold under normal running conditions, this could indicate a sending unit starting to fail or bad connection. This is a low cost item if you have any doubt

replace as the internal damage or complete engine replacement is much more costly.