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A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'97 Chrysler Town and Country, No cooling fans

Q: The cooling fans just stopped working on my ‘97 Chrysler Town & Country. The first time I noticed the problem was driving in town and the temperature gauge started to climb into the hot zone. The only way I could even get the temperature to drop was to turn the heater on full blast. As soon as I got back out on the highway the temperature returned to normal. When I got the van home I found that when the A/C was turned on the cooling fan did not turn on. The cooling fan had always come on when the A/C was turned on. I allowed the engine to idle until the temperature gauge was almost into the red and still no cooling fans. I’ve checked the fuses and the connections to the fans yet I can find no reason for total failure of both coolant fans. Do you have any ideas?

A: Your Chrysler product has a broken screw. Yes, a broken screw. The cooling fan relay for your vehicle is located down on the frame/uni-body to the left of the radiator. Just behind that revengeful air cleaner box that someone who claimed to be an engineer designed. This cooling fan relay looks nothing like one, it has a heat sink incorporated into the relay. The problem we see most often is one of the screws that hold the relay into place breaks off. The job of the screws that hold the relay are two part. One, to hold the relay in its hiding place and 2 to keep the heat sink in contact with the frame. The relay which is computer controlled manages the electrical power supply to the cooling fans. Electric cooling fans use a lot of electricity which translates into heat. For the relay to survive it has to rid itself of this heat. Which explains why the heat sink is held against the cooler metal of the vehicle frame. It seems the screws that were used to hold the relay in place are not of the greatest design, the heads just happen to snap off. Once this happens the relay’s heat sink is no long in contact with the frame and the relay over heats. The relay fails in one of two ways, either the cooling fans turn on full blast and will not stop or they will not turn on. The fix is a new and improved relay with new and improved screws. By the way the relay has been updated at least three times and the last time I called in an order for one they had over 20 in stock. Does that tell you anything?

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