First Cadillac - 2004 SLS
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Cadillac Seville / Cadillac Eldorado Forum Discussion, First Cadillac - 2004 SLS in Past Cadillac Vehicle Discussion; Just bought a 2004 Seville about a month ago. Been using the forums to help locate and fix the usual ...
  1. #1
    eyevibe21 is offline Cadillac Owners Member
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    First Cadillac - 2004 SLS

    Just bought a 2004 Seville about a month ago. Been using the forums to help locate and fix the usual stuff: leaking trunk, intake plenum... . Then it happened. A small puddle of coolant on the ground that seemed to vary in size randomly until I discovered it could be controlled by whether or not I used the heat. Small puddle or no puddle = heat off. Traced the leak to area around the coolant crossover on the firewall side. Could be the black heater line.

    I then began to notice rough idle that cleared up (30 sec.) after cold start. Suspected head gasket leak and discovered exhaust gas in the surge tank. Blue to yellow liquid test. Car doesn't (and hasn't since I've had it) overheat or blow white smoke or wet the tailpipe or bubble the surge tank. Yet. I just figure it's in the early stage.

    I'm gonna be low on funds for a bit. (Mom needs help) Just wondering if there's anything else I can do or did I miss something. Like everyone else I want/need a inexpensive way to keep driving a relatively reliable car.

    Please be Gentle,

    Tone

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    If the fluid changed color at all, there's no good news to be given.

    Don't dump any kinds of sealants into the system. They won't help, and can cause other problems.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: First Cadillac - 2004 SLS

    Bummer - Go down to Engines, Northstar Performance and read the sticky posts at the top of the threads page - there's background on your questions - also snoop through Cadillac Tech Tips in Discussions and study the Cadillac Technical Archive up ^^^ in the top black bar.

    Subscribe the car to www.alldatadiy.com - the GM service manuals plus so much more you need to study how to find it all.

    As posted, DO NOT use magic potions or snake oils - fix it, not patch it.

  5. #4
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Connoisseur
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    Wasn't 04 the new design for bolt issues?

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Not all engines had the course thread bolts until '05.

  7. #6
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: First Cadillac - 2004 SLS

    Quote Originally Posted by rodnok01 View Post
    Wasn't 04 the new design for bolt issues?
    --------
    mid year 04 got the coarser thread bolts -

    ----------

    like all the others have said -
    any color change of the blue liquid is a POSITIVE reaction -
    and that equals head gasket failure - SORRY -

    PLEASE - DO NOT be tempted into using ANY Mechanic-In-A-Can products -
    NONE of them will work on a Northstar motor -
    let me repeat that -
    NONE OF THOSE PRODUCTS WILL WORK in a Northstar motor -

    in fact - it will make proper repair more difficult -
    and could cost more to clean that crap out -

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: First Cadillac - 2004 SLS

    WOW! Very unusual for an '04. Sorry to hear that.

    Wish it where on better circumstances.

  9. #8
    eyevibe21 is offline Cadillac Owners Member
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    Re: First Cadillac - 2004 SLS

    As I suspected. Thanks guys.

  10. #9
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: First Cadillac - 2004 SLS

    All "04" SLS have 03 engines I believe. Sad to hear the news.

  11. #10
    eyevibe21 is offline Cadillac Owners Member
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    Re: First Cadillac - 2004 SLS

    I got back from Youngstown, Ohio a couple of weeks ago. Drove out from Western Massachusetts heading east for about eight hours and arrived at the Cadillac Doctor. Within 30 minutes my car was up on the lift and within 48 hours my car was ready. He stayed up late to finish since I was waiting on the car. The trip was uneventful which was just how I planned it. Aside from some computor reset issues the car proformed nicely and registered a never before seem solid 25 mpg on the return trip.
    I'm begining to get out of the habit of monitoring the temp gage and enjoy driving the car now. Peace of mind and Torque.

  12. #11
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: First Cadillac - 2004 SLS

    Glad you posted the results - glad that the car is "On The Road Again !" (Willie Nelson).

    You might want to look into a ScanGauge-II - I use them in the car and trucks. It's a LCD box that plugs into your OBD port and it will show any 4 of 12 preset gauges, plus it's a code scanner and fuel/trip computer. In the car I monitor coolant temp, intake air temp, ignition advance and MAP (inverse manifold vacuum). www.scangauge.com

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