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2001 eclipse radiator fans will only run when air cond. is on. Have replaced the coolant temp. sensor, any suggestions on trouble shooting the problem.

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Its most likely a faulty/bad relay. in most cases the a/c switch also activates the fan automatically as the A/C compressor raises engine temp. could also be a fuse but i would think not as it does run just not off its own relay. (once your engine coolant temp reaches a set temp the the temp sender triggers the relay to turn on the fans) hope this help, good luck!

Posted on Feb 12, 2012

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