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Overheating while ac is on at a stop or slow speed .

Discussion in 'Technical Chat' started by johnnym, Jun 3, 2013.

  1. johnnym

    johnnym [OP] Well-Known Member

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    So I got a 05 trd offroad 4.0
    Last weekend I was wheeling and it was around 90* outside . I turn on the ac then the temp gauge shot up pretty high . I stopped cranked the heat rolled down the windows and stood outside for 5 minutes . Temp came back down to normal operating temp . Continued the day without using the ac and the truck didn't overheat .
    While normal street driving I can use the ac and it doesn't overheat and the ac is cold like it should be .


    Things I've checked .
    Coolant is full .
    Belt is good
    No leaks
    Ac compressor was replaced when I bought the truck at 40k I now have 100k on it .
    Anyone have any ideas . Or things to check ?
     
  2. BUZZCUT

    BUZZCUT Well-Known Member

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    Check the fan clutch. With that many miles it may be on the weak side to cool at low speeds.
     
  3. johnnym

    johnnym [OP] Well-Known Member

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    Thanks buzz . I'm going to look into that today .
     
  4. lowcountrytj

    lowcountrytj Third Member

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    Yeah fan clutch or time for water pump and flush?
     
  5. Mr.Jack

    Mr.Jack Active Member

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    Honestly sounds like fan clutch to me.i just did mine and it makes a world of difference. You can test it by getting the truck up to operating temp and trying to stop the fan with a rolled up newspaper. If you can slow it to a stop, replace it. 122 $ at advanceauto.
     
  6. johnnym

    johnnym [OP] Well-Known Member

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    Thanks jack
    I'm putting my money on the fan clutch myself . Ill try the newspaper trick in the morning . Did you need to remove the upper radiator hose to replace the clutch ? I guess I might as well replace my coolant while I'm at it.
     
  7. Mr.Jack

    Mr.Jack Active Member

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    No, just disconnect the shroud for more wiggle room. It's easy. I'll only drain fluid and replace when I do the timing belt since it will be in pieces then.
     
  8. johnnym

    johnnym [OP] Well-Known Member

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    Ya I tried that earlier in the week . Didn't help . I picked up a fan clutch today. Try to get that in this weekend . Thanks though .
     
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