92 Deville won't shift down automatically when stopping during driving.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 92 Deville won't shift down automatically when stopping during driving. in Past Cadillac Vehicle Discussion; Pulled over and stopped with car still running, started to move again and it would not shift down automatically. Had ...
  1. #1
    seagreen2000 is offline Cadillac Owners Member
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    92 Deville won't shift down automatically when stopping during driving.

    Pulled over and stopped with car still running, started to move again and it would not shift down automatically. Had to get back up to speed very gradually, like it was staying in high gear. Was able to manually downshift. At the same time the crusie control and A/C quit working.

    This is all a repeat of what happened 4 months ago. Transmission shop replaced the Neutral Safety Switch (NSS). A/C had to be completely replaced too. We notice a rough clicking in the gear shift on the steering column after the NSS was replaced.

    I read something in this forum about fuse #5 needing to be changed from 15A to 20A. Would like to know what caused my NSS and A/C to go out in the first place and fix that, - not replace them again.

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    Aztec ETC ECS's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Fuse blown? That will put the trans in 3rd.

  4. #3
    dennis93coupe's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Never change the amperage of the fuse from 15 to 20. If it is blowing, there is a reason and the problem needs to be found and fixed. You need to pull codes first and then look for shorts in your wiring.

  5. #4
    mc_marto's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Quote Originally Posted by seagreen2000 View Post
    I read something in this forum about fuse #5 needing to be changed from 15A to 20A. Would like to know what caused my NSS and A/C to go out in the first place and fix that, - not replace them again.
    Like Dennis said, don't change the amperage of the fuses. It is there for protection. It is better for the fuse to blow than something else.

    Check the plug on your A/C for shortage, and the other electrical connections on the same circuit.

  6. #5
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    That fuse will blow if your AC compressor is seizing/failing. It's under the dash on passenger side. If it keeps blowing I think you can unplug the AC compressor to verify if that is the culprit.

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    dennis93coupe's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    ^^^^^^ And you might need to go a bit farther and pull the A/C relay.

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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Quote Originally Posted by dennis93coupe View Post
    Never change the amperage of the fuse from 15 to 20.
    Quote Originally Posted by mc_marto View Post
    Like Dennis said, don't change the amperage of the fuses.
    I agree that if the fuse keeps blowing that there is a problem that needs to be addressed, but have you ever seen anything terrible happen from changing a 15 to a 20?

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    dennis93coupe's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Melted insulation.

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    Re: 92 Deville won't shift down automatically when stopping during driving.

    just fix it its not worth a car fire

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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Quote Originally Posted by dennis93coupe View Post
    Melted insulation.
    I've never seen this. You have? So you tried a larger fuse?

    Quote Originally Posted by quins90lac View Post
    just fix it its not worth a car fire
    Never seen a car fire from replacing a 15 w/a 20.

    A 20 will pop just as fast as a 15 with a dead short.

    Upgrading the fuse most likely not fix the problem, but it's not gonna melt the car down either.

  12. #11
    seagreen2000 is offline Cadillac Owners Member
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    You guys are great, thanks for all the good feedback! Okay, so it's most likely the A/C compressor blowing the fuse. Any ideas why and where? I did have to replace the whole A/C awhile back. Thank you! P.S. I would really like to find another 92 or 93 Deville in mint condition for a bargain price. This one started with 23,000 miles and now has 140,000. Any help would be really appreciated. My wife and I drive a lot of long trips across the country. Are we allowed to put our phone number on here?

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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Quote Originally Posted by Aztec ETC ECS View Post
    I've never seen this. You have? So you tried a larger fuse?


    Never seen a car fire from replacing a 15 w/a 20.

    A 20 will pop just as fast as a 15 with a dead short.

    Upgrading the fuse most likely not fix the problem, but it's not gonna melt the car down either.
    5 Amps is a big difference. If you have a short the fuses are gonna blow up right after you install them. But, if you have intermittent shorts or other problems this bigger fuse is going to let a lot more current to pass by it before it blows, which could not only damage insulations, but also relays and whole circuits. So, don't wait to see something happen - it'll be too late. The problem needs to be properly diagnosed and repaired before it turns into a bigger problem.

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    Aztec ETC ECS's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    Quote Originally Posted by mc_marto View Post
    But, if you have intermittent shorts or other problems this bigger fuse is going to let a lot more current to pass by it before it blows, which could not only damage insulations, but also relays and whole circuits.
    So you've upgraded fuses & seen this? I haven't, after 30 years.
    I agree, the larger fuse won't fix, but fabricating fantastical conclusions from unwitnessed assumptions to falsely scare the poor OP is not necessary.

    ----------

    Also, the compressor will not blow the fuse, the clutch on it will, which is serviceable without opening the system.

  15. #14
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    "Upgrade" a fuse??? Are you serious? No, adding a larger fuse to a circuit that was not designed to handle the load is NOT an upgrade, it's a HAZARD. If there's a short in the circuit, the larger fuse will most likely just blow, and not cause a problem. But if the problem is causing excess load on the circuit, the larger fuse may not blow right away, and the wires WILL overheat, and insulation damage/fire is a real possibility.

    Good thing there's nothing flammable in a car, especially under the hood...


  16. #15
    Aztec ETC ECS's Avatar
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    Re: 92 Deville won't shift down automatically when stopping during driving.

    AGAIN: I am not recommending a larger fuse.
    But in 30 years of workin' on cars, I've never seen this

    from doing so.
    Has anyone?

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