Question about 2000 Chrysler 300M

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1999 Chrysler 300M overheating

Hi, Donny.  I have a chrysler 300M that has a strange pattern of overheating.  A couple of months ago it started to overheat on a ten mile trip back from the mall.  I pulled to the side of the road, killed the engine, gave it about four minutes, and restarted it.  It began to cool quickly, as if the water was not previously circulating and had then begun to do so.  I got home and checke the levels, but it was okay.  Since then, it was fine until yesterday (as far as I can tell - my girlfriend drives it about six miles to work each day, and it never really has much opportunity to overheat).  Yesterday I was going to drive it about 45 miles, but it was getting really hot about 20 miles into the trip.  I pulled into a station, let it cool down, checked levels and added no more than about a half gallon of water - filling the reservoir to the top  (this later blew out, so I am reasonably sure it was full even then).  It was okay for about three miles and then got hot again.  I turned it around and little by little got it home.  
The root of this problem, I'm pretty sure, is that water is not circulating.  I was thinking it must be the thermostat, and that it simply "unstuck" the last time this happened making things appear normal again. Since it does circulate sometimes, I think the water pump is functioning, but I may be wrong.  I started looking online to check and see if this is a common occurence with the 300s, and have since found a few people who say they've replaced waterpumps, thermostats, fuses, fans, etcetera and still have issues.  Since I was going down the highway at only about fifty five miles per hour, wouldn't the wind alone have cooled the engine if the fan wasn't working?  Any advice you can give me will be a great help.

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  • pandav218 Jan 11, 2009

    Hi . I have a 2000 300m with 126,123 and had the same problem last year.I also thought that the problem was either the water pump or the thermostat.I ended up changing the thermostat,lower and upper hoses.Then my radiator began to leak and so it was replaced also.I still saw my gauge going way up past where it should be.So began another search and found wires to one of the fans damaged.The unit was replaced because the fan motor was also bad.Finally i changed the temperature sending unit and things have been beter since .

  • yadayada
    yadayada May 11, 2010

    Try the live chat, this is way to involved for the free forum.

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I am having the same prob. on 04 300m 83,000 mi. I am a chrysler tech and another tech at my shop had the same problem a week ago. Mine started when i Was on the thruway my guage crept up to 3/4 so i kicked the heat on and it went normal. After stopping I found the water pump went and was leaking bad. I replaced the waterpump timing belt and tensioner pulley. thought it was good untill on a long trip. Noticed temp goin up no leaks this time, coolant full. doesnt overheat with heater on. Actuated fans with DRB3 and both work and are working when car says its overheating. Replaced thermostat and bleed system. thought it was ok untill drove 35mi. suspecting bad wiring plugged radiator or coolant temp sensor. Still driving with heat on low to keep from overheating. any others fix this problem yet?

Posted on Jun 05, 2009

  • kd5rcx1 Aug 11, 2011

    Chrysler C-r-a-p one tech suggested raising the front of the car ( high as you safely can ) and bleed the air out again. There's a ton of air trapped at the back of the engine ( Hey Chrysler! put in another bleeder valve ! )

  • Jeremy Cromer
    Jeremy Cromer Nov 03, 2013

    Vincent Did yours ever get fixed? Mine is doing the same thing and about to give up!

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SOURCE: because if you put the

So you changed the thermostat?
Water will not circulate while engine is cold. As it reaches normal temp it should open and circulate. If it is overheating when warmed up, and still not circulating, then either the thrmostat is bad or wrong type, or it was installed wrong and somthing is blocking it.
One other thing possible is the water pump is broken, but usually when pump is broke, it leaks, from the back of the pump.
You could check the belt is correctly driving the water pump.

Posted on Apr 10, 2011

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