Question about 1995 Jeep Grand Cherokee

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Temp increases on idle and aircon fails

I have a 95 orvis. temp rises when idle. goes way over 210 but never overheats. aircon also fails after temp hits 210. also hear a clicking sound in the left portion of the hood. what should i do?

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  • buddy_aranco May 25, 2009

    I'm not too familiar with the nomenclature of the parts but if the fan that your mentioning is the big fan right by the radiator then it is working fine. Flushed the radiator clean earlier today. I'll see if this can improve the performance. Will let you know what happens. Thanks for the help.

  • buddy_aranco Jun 10, 2009

    it is not really a clicking sound. more of a "tok-tok-tok" sound. located it to be around the air intake filter area but i can't pinpoint exactly where it is. I do not see any turning gears or fans on that area. must be something that is enclosed in a casing.

    also observed that my temp indicator starts somewhere between 0-210 but steadies at the line before 210 when i am running smoothly. still goes to 210 when traffic is bad.

  • buddy_aranco Jun 10, 2009

    good to hear. but should i lose the coolness of my a/c? air out of my a/c starts to increase a bit once the temp stays a bit at 210.

  • buddy_aranco Jun 10, 2009

    great help! care to share the normal operating pressure / batt charge / fuel consumption / etc.

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  • Jeep Master
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Does the electric fan come on and stay on when it's hot? Find what's clicking it could be the relay for either a/c or fan. (though they usually are on the passenger side in the power distribution center near the battery. Your system works pretty much like this: the temperature sender on the engine sends info to the computer which sends a message to the relay to turn the fan on. The a/c bypasses this to some extent and turns the fan on every time the compressor is running.
Your radiator must be really clean or it would be blowing coolant all over the place a bit over 210, unless the gauge is reading incorrectly.

Posted on May 23, 2009

  • 2 more comments 
  • Richard Scordino May 25, 2009

    I probably should have asked what the engine size is...I'm not talking about the belt driven fan...You need to make sure that the electric one that comes on with the a/c compressor is going on. Clicking could be a problem with the relay that controls it. Cleaning out the radiator is not a bad thing to do at any time, but I didn't mean you should clean it out, I meant that I believed it must be fairly clean or it would be permitting it to overheat more easily.

  • Richard Scordino Jun 10, 2009

    If you are holding at 210 you are fine...I have three Jeeps and all hold that temp and all are fine! (a bit less in winter and a tick over in summer.

  • Richard Scordino Jun 10, 2009

    As long as the compressor is operating normally and pressures are correct, I'd suspect that a blend door inside the heater box is not closing fully, and is allowing some warm air into the airstream. Obviously, when engine is at operating temp, this will be more noticeable than when engine temp is lower. Unfortunately the door and controls on Jeeps are nearly impossible to reach (thank you engineers) and usually require removal ot the entire unit to work in there..

  • Richard Scordino Jun 10, 2009

    Off the top of my head, batt voltage should There is a chart somewhere that shows operating pressures of different A/C systems...That, along with everything you just asked is stuff I purposely don't try to remember (leaves more brain space for thinking...If it's written down, why try to remember it?) I have a chart somewhere but have not used it in a long time. range between 12.9 to 14V, never above or below that. Fuel consumption is related to fuel type, driving habits/conditions and mechanical condition of a particular setup. (you establish a baseline)

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