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Thread: 1995 SLS Coolant and Light problems.

  1. #1
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    1995 SLS Coolant and Light problems.

    So,

    Just got this 95 Seville SLS. Drives great....2 miles down the road I smell the strong smell of coolant in the cabin and the dash reads check coolant level. Coolant is also reading about 220 degrees.

    I am assuming this is the heater core that is causing the problem? It must be because the heat isnt blowing cold. I have read a few discussions. Some say you can replace it by just removing the glove box. Others say you have to remove the dash. Which is it?

    I am also having problems with the twilight feature. The dash lights go on and off.

    Any fixes for this?


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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 1995 SLS Coolant and Light problems.

    Welcome Aboard !!!

    A strong coolant smell is indicative of a leak somewhere. A failed heater core will usually cause fog on the inside of the windshield and/or a wet carpet.

    Please study the sticky posts just above this one, the stickys in Engines, Northstar (cooling, fans, gauges) and study the entire Cadillac Technical Archive way up ^^^ in the top black bar. LOTS of cooling system info. Google "cadillac forums seville heater core replacement" or similar format for other questions. It's all in here somewhere.

    The Twilight Sentinel may be faulty - switch or light sensor (in the top of the windshield dash vent panel). Use the proper year/model group of instructions in the sticky post "How to pull codes" to enter your car's built-in code reader/memory. Use the link to OBD-1 codes to get to definition lists of the various types of DTCs.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1995 SLS Coolant and Light problems.

    Are you sure you are not smelling coolant from the overflow on the surge tank? That said, it should not be overflowing at 220 degrees.

    No foggy windows or wet carpets?

  5. #4
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    Re: 1995 SLS Coolant and Light problems.

    Nope. No wet carpet of foggy windows. The heat doesn't work.

  6. #5
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The dash has to come out for '98+ Sevilles. But it doesn't sound like your heater core blew.

  7. #6
    Ranger's Avatar
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    Re: 1995 SLS Coolant and Light problems.

    No heat = air in the system
    Coolant smell = a leak.

    Check the two heater pipes that run along the rear head (#5 & 6). They are known to rust through.


  8. #7
    jeancastio94 is offline Cadillac Owners Member
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    Redently i purchased a 95 seville sls & the heater core is by passed but i have a water leak now ive added antifreeze to the resovour &.fpr the past two days its been at the same level so i know the resovor isnt cracked but something somewhere is leaking , help me man, my first caddy im all new to this

  9. #8
    Ranger's Avatar
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    Re: 1995 SLS Coolant and Light problems.



    You added water to the FPR?

    Maybe your leak is evaporating before dripping. Look at the radiator side tanks. Also, depending on where you did the bypass, check the heater pipes that run along the rear head. They are known to rust through and leak.

    If you still have Dex-Cool in the engine, look for chalky white telltale signs of dried Dex.


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