'93 STS Oil cooler
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Northstar Engines and System Technical Discussion Discussion, '93 STS Oil cooler in Cadillac Engine Technical Discussion; I live in New England, lots of salt on the roads during the Winter. The three lines that feed the ...
  1. #1
    dvdclark is offline Cadillac Owners Member
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    '93 STS Oil cooler

    I live in New England, lots of salt on the roads during the Winter. The three lines that feed the oil cooler were rusty and seeping engine oil. So I replaced the lines (dealer price $150.00) but when I started the car the oil cooler started leaking. It's an easy replacement, but the price of a new one is over $200.00. For the time being I put a union between the input and output lines to bypass the air-oil cooler. The oil still runs through the radiator though. I'm considering leaving the air-oil cooler bypass in place. My question is, since I live in a part of the Country that doesn't get very hot, do I need to replace the air cooler?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: '93 STS Oil cooler

    Are you sure it is for the engine oil?

  4. #3
    dvdclark is offline Cadillac Owners Member
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    Re: '93 STS Oil cooler

    Yes, the tranny air cooler is small and on the left side of the radiator. The engine oil cooler is bigger and on the right side and is fed by high pressure lines that originate from the engine oil filter adapter.

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    Ranger's Avatar
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    Re: '93 STS Oil cooler

    The oil cooler is inside of the right radiator side tank. It sounds to me like you are talking about an auxiliary cooler, maybe even aftermarket. I would not think you'd need it unless you are towing and then a trans cooler would be more appropriate.

  6. #5
    PontiacV8's Avatar
    PontiacV8 is offline Cadillac Owners Fanatic
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    Re: '93 STS Oil cooler

    Quote Originally Posted by Ranger View Post
    The oil cooler is inside of the right radiator side tank. It sounds to me like you are talking about an auxiliary cooler, maybe even aftermarket.

    ...early N* STS and Eldos got an "outside" auxilary engine oil cooler...





  7. #6
    Ranger's Avatar
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    Re: '93 STS Oil cooler

    Hmm, thanks PontiacV8. I wonder why. At any rate, if the later ones don't have it and don't need it, I would say you'd be just fine leaving it bypassed.

  8. #7
    dvdclark is offline Cadillac Owners Member
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    Re: '93 STS Oil cooler

    Thanks, I needed a second opinion to back up what I suspected.

  9. #8
    jakben is offline Cadillac Owners Member
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    Re: '93 STS Oil cooler

    Mine is also damaged ...
    what is the part number? ...

    I live in France and want to buy one, but can not find

  10. #9
    Submariner409's Avatar
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    Re: '93 STS Oil cooler

    jakben, call Chris in Parts at Rippy Cadillac - up ^^^ in the Vendors posts. He may not be able to ship overseas, but he can advise you on the best course of action.

  11. #10
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: '93 STS Oil cooler

    Funny,

    I always wondered why the early northstars had engine oil coolers and the later ones didn't. I still may retrofit one onto my eldorado....

  12. #11
    Submariner409's Avatar
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    Re: '93 STS Oil cooler

    All it would take would be the oil filter adapter, oil lines and radiator....................but if you don't tow a trailer, race steadily, or live on the side of the Rockies, why go to the trouble ???

    The oil in these engines runs right where it should be - 200 to 230 degrees: the oil coolers in our cars, if fitted, are in the "hot" end of the radiator, so their function is to keep the oil at or above coolant temp at normal engine operating temperatures. This insures that any condensation moisture and acid vapor is boiled out of the oil and consumed by the PCV system. The term "oil cooler" is a nice buzzword, but it's relative: 210 degree oil is perfect; 250 degree oil is not; relatively cold oil is just as bad for an engine as overheated oil.

    Not sure if all early Northstars were fitted with oil coolers - that seems reserved for the special order and/or towing "HD Cooling" package RPO - V03. I believe most of the cars destined for European sale had oil coolers - a steady 120 on the Autobahn is a far, far different set of engine operating conditions than plodding down the I corridor at 65 mph with its lazy engine speed.

  13. #12
    Ranger's Avatar
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    Re: '93 STS Oil cooler

    I'm pretty sure my '97 Deville had an oil cooler (in the radiator side tank, not the aux cooler pictured above).

  14. #13
    CadillacLuke24's Avatar
    CadillacLuke24 is offline Cadillac Owners Connoisseur
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    Re: '93 STS Oil cooler

    Now I know what one looks like, I'll have to check Alexandra for one.

  15. #14
    98eldo32v's Avatar
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    Re: '93 STS Oil cooler

    Thanks for the information guys.

    Most earlier model STS had the oil coolers fitted to them. In the salvage yards I seel a lot of them with them equipped, Eldorado's are few with the coolers. Most of the time the lines or "o" rings are leaky but That's a relative easy fix.

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