Where is the oil pressure switch located - 84 Deville HT4100
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HT4100 4.1, 4.5, 4.9 Discussion, Where is the oil pressure switch located - 84 Deville HT4100 in Cadillac Engine Technical Discussion; I'm trying to replace the oil pressure switch on my 84 Deville HT4100 due to DTC's being set off, however, ...
  1. #1
    henrydean40 is offline Cadillac Owners Member
    Automobile(s): 1984 Cadillac Sedan Deville - ht4100
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    Where is the oil pressure switch located - 84 Deville HT4100

    I'm trying to replace the oil pressure switch on my 84 Deville HT4100 due to DTC's being set off, however, I don't know where it is physically located. Can anyone tell me where to find the little sucker? Picture is shown below...

    OIL PRESSURE SWITCH.jpg

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    aeronca36606 is offline Cadillac Owners Enthusiast
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    Re: Where is the oil pressure switch located - 84 Deville HT4100

    It is on the side of the oil filter adapter.

  4. #3
    henrydean40 is offline Cadillac Owners Member
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    Re: Where is the oil pressure switch located - 84 Deville HT4100

    How do you get the old one off? There's no wrench that fits - and there's limited space by the thing. Do I take a vice grip and just try to unscrew it????

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    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
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    Re: Where is the oil pressure switch located - 84 Deville HT4100

    should be 19 mm and/or 3/4 inch bolt head

  6. #5
    henrydean40 is offline Cadillac Owners Member
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    Re: Where is the oil pressure switch located - 84 Deville HT4100

    This one was tough....I fought with it all weekend.
    I measured the new one I had, and it would take a 1-1/16 DEEP socket. (at least for this vehicle). The electrical pins make it so that a regular socket isn't deep enough. Of course, I don't have a deep socket that size so I tried whatever I could get to fit: an adjustable wrench, pliars, vice-grips etc. What finally ended up working is taking a long screw driver and a hammer, place the screwdriver in one of the notches and tap, tap, tap away until the little thing starts to turn. We finally got it loose and were able to remove it.

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