2004 Eddie Bauer 5.4 liter A/C blows hot only on hot days

Discussion in 'Heating & Cooling' started by jleroy68, Jul 11, 2017.

  1. jleroy68

    jleroy68 Member

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    Compressor not turning if I shut engine off after driving enough to get engine hot, and restart on any day over about 90°. If I leave it running it’ll stay cold but the second I turn it off and restart hot air only. Fine on days below 80-85°?
     
  2. docraymund

    docraymund Full Access Members

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    You may have a restriction in the system causing the compressor to automatically shut off during hot days. Have a reputable ac shop check it.
     
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  3. stamp11127

    stamp11127 Super Moderator Staff Member

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    Jleroy68, how are you with electrical troubleshooting?
     
  4. jleroy68

    jleroy68 Member

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    Not to good, but my son in law is.
     
  5. stamp11127

    stamp11127 Super Moderator Staff Member

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    When the system isn't working (better with a "cold" engine) you check for power at the fuse then the ac compressor connection. Engine running, ac set to max. If there isn't power at the compressor you follow the wires back to the source checking for voltage at each connector or splice. At some point you will have power on one side of a wire or connection and none on the other.
    If you have the electronic control ac, run the diagnostic routine first. A failing EATC module can kill the system at any time or temp.
     
  6. jleroy68

    jleroy68 Member

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    Ok, appreciate the advice. Thanks.
     
  7. stamp11127

    stamp11127 Super Moderator Staff Member

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    See Fuse testing 101 in the electrical section on testing them in place.
     
  8. jleroy68

    jleroy68 Member

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    I’ve done that. The thing I can’t get into my brain is there’s no problem as long as the temperature is appx 85° or less it works just fine. But when I get into the 90’s and shut it off it’ll just blow hot, usually til the next morning. It’s got to be something maybe under the hood that is affected by heat. I’m thinking what docraymund said makes sense. Unless there’s a relay under there that gets stuck when hot?
     
  9. stamp11127

    stamp11127 Super Moderator Staff Member

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    Ok, let us know what you determine.
     

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