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Cars > Forums > Tech Garage > 1999 Chrysler 300M strange overheating issue

 

Forum: Tech Garage

  • Topic: 1999 Chrysler 300M strange overheating issue
  • Started by DaleinOklahoma Jun 28, 2013 at 9:49 pm
  • Last post by DaleinOklahoma Jul 5, 2013 at 4:35 pm
  • This topic has been viewed 746 times and has 2 replies
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Topic: 1999 Chrysler 300M strange overheating issue

Forums > Tech Garage > 1999 Chrysler 300M strange overheating issue

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  1. #1 Jun 28, 2013 at 9:49 pm

    DaleinOklahoma’s Profile Photo
    DaleinOklahoma
    Total posts: 2
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    Hello all, and thank you for letting me join this wonderful group. wink image We had a 300M from 1999 till last year, when we traded it in for a Suburban. We missed it and went down to Dallas today to pick up another on. We got it cheap enough, because it is high mileage, that we could afford repairs if need be. It has 210k miles, but it looks immaculate on the outside and inside. It test drove GREAT! And that was a thirty minute test drive in Dallas traffic, on open freeway, and sitting and sitting, and sitting. My main fear is overheating issues. It passed with flying colors so we bought it for $1700.

    SO. We left Dallas and went over to Fort Worth to grab a bite. Everything was great. We got stuck in traffic heading North out of Fort Worth and everything was great, no overheating and the temp gauge never moved from midway. We get on the interstate and my wife is following me in the 300M. I cruise along averaging about 75 and make it about 45 miles into Oklahoma when we start going into our very miniature mountain range the Arbuckle Mountains. Most people would not consider these mountains. Anyway, my wife pulls over and I go back and the temp gauge is maxed out. I throw a tantrum about her letting it get so hot and how she should have been paying better attention. I sit by the car while she goes and gets me two gallons of coolant from town. We fill the reservoir and I start driving the car. It is fine for about 8 miles and then it gets hot. I haven't taken my eyes off the temp gauge and it goes from midway to maxed out in about 15 seconds. I pull over and apologize to my wife. smile image I open the hood and apparently I didn't tighten the cap all the way, which I swore I did. So once again I fill it up and take off. We get about 5 miles and again, medium to HOT HOT HOT in about 20 seconds or so. I pull over again and we let it cool. I remember this time to loosen the vent to make sure no bubble. Refill once again and take off. It then gets hot in less than a mile so I tried gunning it (which sometimes work to unstick my thermostat in old farm truck). It cooled off enough and went to about 3/4 but just went back to hot. Repeat, gun, and slightly cool off for a bit and then just hovered below the red. The next town by this time is about one mile so it did OK long enough for me to get there and park. It was steaming when I shut it down. So now I go down in the morning and haul it back. I have done about zero trouble shooting at this time and will spend all day tomorrow checking out all the normal issues. The Fans definitely do work when the key is on.

    I am only posting this, without any real information on hot or cold uppers and lower hoses, or water pump test, or anything else because of the way it happened. It was very strange to me that it went through all the traffic and stopped up traffic and highway speeds for 100 miles before it decided to shoot up hot. I did notice a pretty good whine at high rpms and it turned out to be the a/c compressor. It sounded like it was coming from there and it quit when I turned off the a/c. I figured a bearing was out and after the third time pulling over I just cut the a/c belt to make sure. Of course this didn't help me.

    If anyone has any suggestions, please let me know. Tomorrow morning we are going to go get it and I will do all the "testing" to try and narrow it down. Thanks in advance for any help or moral support. lmao image
     

     

    Dale in Oklahoma
  2. #2 Jul 1, 2013 at 11:42 am

    DanDew’s Profile Photo
    DanDew
    Total posts: 1
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    sounds like a head gasket lifting when it gets warm then the heat from the piston heats up the water. When it is overheating do a compression test that should tell you
     

     

  3. #3 Jul 5, 2013 at 4:35 pm

    DaleinOklahoma’s Profile Photo
    DaleinOklahoma
    Total posts: 2
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    Thank you for the response. That would make sense given the circumstances, but it is definitely a new one to me. Luckily I hadn't wasted my time or money yet on the little fixes because of the 4th of July festivities. Thanks again!
     

     

    Dale in Oklahoma

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