Service AC System
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Cadillac STS Forum - 2005 through 2012 Discussion, Service AC System in Past Cadillac Vehicle Discussion; Well shoot....have to write this for a second time.... About four days ago I was sitting in traffic for road ...
  1. #1
    SpeedGP is offline Cadillac Owners Member
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    Service AC System

    Well shoot....have to write this for a second time....

    About four days ago I was sitting in traffic for road work, decided to turn the car off....bad idea...car wouldn't start, finally got a jump and drove home. Ended up having to get a new battery. Ever since the jump my DIC has said Service AC System every time I start the car, also doesn't show outside temp. I used a cheap scan tool (U408?) and it said there was no code, even after starting the car and rescanning after the error came up.

    On top of all this I've been researching for days and can not figure how to get into the cars diagnostic menu... I have an 05 STS without Nav, can I get into the menu? Hold AC off and Warmer button, right? Which is the warmer button? Heated seat up? Fan up? Heater on/off button?

    Someone....please.....help....48382-1.jpg

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  3. #2
    Guy.Seminerio is online now Cadillac Owners Connoisseur
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    Re: Service AC System

    The car doesn't have a diagnostics thing in the DIC the way the older caddys did. They dropped that feature.

  4. #3
    SpeedGP is offline Cadillac Owners Member
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    Re: Service AC System

    Any clue about the AC thing?

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Try disconnecting both battery cables, and touching them together momentarily. Odd electrical glitches can happen after/because of a low voltage condition and/or jumping.

  6. #5
    SpeedGP is offline Cadillac Owners Member
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    Re: Service AC System

    Was hoping it didn't come to that...I just set all of my personal setting back to where they were before, but no big deal, live and learn

  7. #6
    Subsailor613's Avatar
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    Cool Re: Service AC System

    All you should lose is the Windows Express, and it takes 4 minutes to reset ALL of them
    Or, Just leave it uplugged for a while, 5 or 10 minutes.Be ready with your FOB, as the
    audible alarm "may" come on, when replacing the battery cable, 'TRY' to put it on with one
    try, NOT intermittently.
    Happy Motoring

  8. #7
    SpeedGP is offline Cadillac Owners Member
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    Re: Service AC System

    I just tried the battery lead touching thing.... Didn't work, but after reading your message, I think it got an intermittent connection while I was putting it on... I'll give it another shot.

    Do you touch them really quickly? or 10 seconds?

    I should be getting a better (ELM327) scanner tomorrow(?) that I can scan it with and possibly clear the code, if there is one.

    The other thing I think is weird is the AC still works...as far as I can tell... because when I turn it off, my windows fog up pretty quick, then I turn it back on and all the windows defog... Maybe it's just low on R132 or whatever? If I plugged in a scanner would I be able to navigate to sensor info from the AC Compressor (I've never used one, but am happy to learn how to)

  9. #8
    AllWheelEric is offline Cadillac Owners Fanatic
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    Re: Service AC System

    Perhaps you accidentally disconnected a temp sensor or something else while getting the jump start.

    I don't think the ELM327 will help. I've got one, but it only accesses standard OBDII codes. It doesn't access everything in the car's computer.

  10. #9
    SpeedGP is offline Cadillac Owners Member
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    Re: Service AC System

    What kind of a scanner would I get for that then? Anything reasonably priced?

  11. #10
    1BadCadSTS's Avatar
    1BadCadSTS is online now Cadillac Owners Connoisseur
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    You need a tech 2 or an upper level snap on scanner.

  12. #11
    SpeedGP is offline Cadillac Owners Member
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    Re: Service AC System

    Ah Ha! Finally had the time to get this fixed!

    Since the DIC wasn't displaying the outside air temp, I was wondering if it was the temp sensor located diagonally left and down from the hood release. I managed to get my hand down there and pull it out (it is grey and has a green clip). If you try hard, you can unattach it from the clip holding it onto the frame or whatever. You can order this from eBay for about 6 bucks and it takes about ten mins to install.

    DIC is not displaying Service AC System any more and it is showing outside air temp now

  13. #12
    SpeedGP is offline Cadillac Owners Member
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    Re: Service AC System

    Ah Ha! Finally had the time to get this fixed!

    Since the DIC wasn't displaying the outside air temp, I was wondering if it was the temp sensor located diagonally left and down from the hood release. I managed to get my hand down there and pull it out (it is grey and has a green clip). If you try hard, you can unattach it from the clip holding it onto the frame or whatever. You can order this from eBay for about 6 bucks and it takes about ten mins to install. The NEW ACDelco part number is 25775833, the old one that was my original part number was 503876....or something.

    DIC is not displaying Service AC System any more and it is showing outside air temp now

    Easy fix 177655-2.jpg

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