Chrysler Repair: CHRYSLER 300M OVERHEATING & A/C, blown fuses, radiator cap

Question
I really hope you can help me out with this one.  I have a Chrysler 300M and is overheating and after the overheating started taking place the Air conditioner stopped working, when I turn it on it blows hot air.  I have checked many of the tips you have given other people in this website, it was very helpful, but I tried different things and did not work in my case, so I am wondering if I have a bigger problem.  I noticed there was a blown fuse (30A Radiator fan), I changed it and the new one was blown righ away.  I tried switching the relays to test the fans and it didn't work either.  I went to an auto parts store and the man said he could almost be sure I am having a short circuit in the cables that go from the fans to the engine.  Now, I have no clue which one this is, I see one switch with different cables and is kind of hard to get my hands in there.  Could it be the radiator cap or a tempeture sensor?  If yes, please let me know where in the car they are located.  Does this have anything to do with a short circuit somewhere?  I know you have helped out many people, please help me out also.

Thank you in advance!
Vicky
Chicago, IL

Answer
Hey Vicky,
You do have a short circuit but it's not in any of the wiring.  Today I replaced the fan module assembly on a concorde of the same era as your 300M for this very problem.  

Overheating, a/c inop.  I found two blown fuses in the PDC (relay box under the hood) and also noticed the driver's side fan did not turn smoothly.  I put in two new fuses, unplugged the fan module and cranked the car up.  The fans of course did not come on but the a/c finally worked.  A fan assembly and two fuses later the customer left with their car today a happy camper.

It's definitely NOT the radiator cap causing the fuses to blow and slim chances are that it's a sensor.  Check to see how freely your fans move and unplug them regardless to check for fuse longevity after replacing.  Once you've verified that the fuses no longer blow, replace the fan module.  

I don't know how much the fan module is... let me back up.  I keep saying fan module but what I mean is the fans, the motors, and the plastic shroud they are contained in.  That's the module I speak of.  Regardless, we got this module from an aftermarket parts store so you have options if the dealer is a bit pricey.

Also, to unplug the fan pop the hood.  Look at the metal that goes between the two headlights.  That's the upper radiator support.  On the bottom side of that support you will see the fans.  The main connector for both fans is located about half-way between the hood latch and the driver's headlight.  Push the red clip to one side and then press the other locking tab to pull the two joining pieces apart.  

Hope that helps,
Doug