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There are a few reasons this could happen. One being that the temp sensor is not telling the fan to turn on. Another could be the fan itself is defective.Another could be the fan relay or the wiring to the fan. If someone has recently been under your hood they may have inadvertantly disturbed the connection at the plug where the fan connects. Have the fan itself tested before getting all complictaed. It could be a simple problem.

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Q: Why would fan by radiator quit turning on Pontiac lemans 16 engine?
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