Outside temp sensor and car washes - issue
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Cadillac STS Forum - 2005 through 2012 Discussion, Outside temp sensor and car washes - issue in Past Cadillac Vehicle Discussion; Anyone else have this? When I wash the car, the outside temperature reads 10 to 15 degrees low for several ...
  1. #1
    carter's_sts is offline Cadillac Owners Connoisseur
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    Outside temp sensor and car washes - issue

    Anyone else have this? When I wash the car, the outside temperature reads 10 to 15 degrees low for several hours afterwards. It will eventually go back to normal, but it takes a really long time.

    I'm pretty sure that sensor is behind the grill and, of course, gets wet when I spray the grill. I'm thinking the sensor probably has a problem, but if other people say they have this, I won't worry about it.

    Also, anyone have the part number for this sensor?

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  3. #2
    snum1fan is offline Banned
    Automobile(s): 2005 STS
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    Re: Outside temp sensor and car washes - issue

    It happens to me too. I haven't paid enough attention to it t see if lasts for a couple hours. I am planning on washing my car tomorrow, so I will let you know how long mine does it for.

  4. #3
    Force-1 is offline Cadillac Owners Fanatic
    Automobile(s): 06 Cadillac STS
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    Re: Outside temp sensor and car washes - issue

    My STS does this too, as well as several other outside temp equipped vehicles I've owned.

  5. #4
    next2pool is offline Cadillac Owners Connoisseur
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    Re: Outside temp sensor and car washes - issue

    Every car I've had with outside temp sensors has done this. I think they get wet and the evaporation creates a cooling effect fooling the sensor.

  6. #5
    trackbait is offline Cadillac Owners Fanatic
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    Re: Outside temp sensor and car washes - issue

    Speaking from having had 2 Vettes, the OAT sensor may not read correctly until the car has been driven for 3 miles or more at a speed in excess of 25 MPH. This is part of the computer processing that helps protect the HVAC system.

    Mine reads consistently 3 degrees above actual temperature. Don't know why. Hardly think the OAt is bad with only 16k on an 08

  7. #6
    carter's_sts is offline Cadillac Owners Connoisseur
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    Re: Outside temp sensor and car washes - issue

    Thanks Guys! The evaporation thing makes sense, but I'm surprised that it lasts so long. I'm talking about driving well above 25 for a long time. Based on what you're saying it's probably normal. I think the sensor is really cheap, although it's hard to nail down the part on the Web sites I've been looking at. I might try it sometime if it is cheap just to satisfy myself. I'll update if I do.

  8. #7
    carter's_sts is offline Cadillac Owners Connoisseur
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    Re: Outside temp sensor and car washes - issue

    It's funny, the part is only $6.41, so I was going to order it. Now I'm trying to decide if I want to pay the 9 to 12 dollars shipping. I know it's dumb, but that just bugs me (-:

  9. #8
    snum1fan is offline Banned
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    Re: Outside temp sensor and car washes - issue

    I had a 2000 Deville before my current 05 STS, and rented cars straight for 18 months for work. Both caddys and every rental I washed and had a temp gauge did the same thing. I always leave the display on temp so I noticed it alot. Some of the cars rented were sts cts maxima charger 300 m35 Aspen, and more all 2008 and 2009.

    So o don't think anything is wrong. I think that's just the way it is.

  10. #9
    carter's_sts is offline Cadillac Owners Connoisseur
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    Re: Outside temp sensor and car washes - issue

    Thanks. That's great info. I think I'll leave it well enough alone.

  11. #10
    SteveDeville2004 is offline Cadillac Owners Member
    Automobile(s): 2004 DeVille
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    Re: Outside temp sensor and car washes - issue

    I have a slightly different problem with the outside temperature sensor on our 2004 DeVille. Starting this summer, the outside temperature display began to read higher than the actual outside temperature but it still seemed to go up and down with the ambient temperature. However, lately it is always reading very high. For example, it is currently 55 degrees outside but the temperature reading on the display says 133! To get heat we have to run the temperature setting up to the max. Does that make sense?

    I'm guessing (hoping) that the problem is due to a bad sensor. I'd like to replace it but can't find it. Could someone tell me where it is located?

    Thanks.

  12. #11
    trackbait is offline Cadillac Owners Fanatic
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    Re: Outside temp sensor and car washes - issue

    Have not had an eyeball on it yet but appears to be somewhere on the drivers side, probably down low around the grill somewhere.

    Here is a diagram from GM PARTS DIRECT on the part, price, and location.


    .
    .
    Easy to fix/replace once located.

  13. #12
    carter's_sts is offline Cadillac Owners Connoisseur
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    Re: Outside temp sensor and car washes - issue

    On the STS it is right behind the upper part of the grille, but he's asking about a 2004 DeVille. Might want to try another forum.

  14. #13
    mikerizzo01 is offline Cadillac Owners Member
    Automobile(s): 2004 cts
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    Re: Outside temp sensor and car washes - issue

    Anybody have a wiring diagram for the outside temp sensor? Mine got cut off and I have a new switch and some connectors but do not want to wire it wrong

  15. #14
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: Outside temp sensor and car washes - issue

    There's a buffer/average for the sensor, so going through things like a car wash, don't drop it radically.

    I've noticed this one takes quite a while to change.

  16. #15
    johnpbaird is offline Cadillac Owners Member
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    Re: Outside temp sensor and car washes - issue

    Lookin For the part Number,.......(2005 XLR)

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