Question about 1999 Chrysler 300M

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Passenger side radiator cooling fan stopped working

I installed a new dual fan radiator cooling assembly and everything was fine for a week The OE one had literally fallen apart after 160,000 miles. Now the passenger side fan on the new fan assembly has stopped spinning causing overheating in warm weather if driving slow. All fan fuses are OK. Doubt if a new fan motor is bad after only a few weeks.

Any tips?

Posted by on

  • boeing377 Jun 29, 2009

    I looked at the schamtic and it shows both fans running off the same power buss, a high speed input, low speed input and ground. Either the dead fan has a defective motor or there is a break in the wiring connecting the two fans. The fans are fed power from a common plug. Each fan also has a connector.

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I found that for some reason if you start your car and then remove and reinstall the hi and low relays that the fans work. I have done this numerous times on my 1995 lhs. I thought that my fans were defective until by chance checked the relays which engine was running.

Posted on Jul 23, 2009

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Posted on Jan 02, 2017

gypsycat00
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SOURCE: my fan also has quit the assembly is new so i

Use a known working relay of the same type and turn on your a/c on high, then put in the relay where the old high speed fan relay was. If it comes on, it's the relay. Try this on low speed as well. If they don't come on when the A/C is on, it could be your pcm/ecu as well. If it doesn't communicate with the sensor, it won't turn on. Check with A/C running to narrow it down. If they work here, look into the engine coolant temperature sensor.

Posted on Jul 17, 2009

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