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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 STS Running Hot in Past Cadillac Vehicle Discussion; I have been a GM owner since 68 and while Gm test their cars and parts they do leave at ...
  1. #121
    mike5514 is offline Cadillac Owners Enthusiast
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    Re: 99 STS Running Hot

    I have been a GM owner since 68 and while Gm test their cars and parts they do leave at times the final testing to the consumer. I do not like being a test dummy for them. I try and stick with what works.

    When the Gm shop gets a car with a oil warning the normal repair is the oil pressure switch ( its been around for eons) of course while you are in that area you change the E-CORE oil filter (been around a few years) and the oil you really don't know what caused the warning. New and improved or New and have to prove? Mike

  2. #122
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 99 STS Running Hot

    not all dealers (GM shops) are the same ... not all technicians/mechanics are the same ...

    food for thought
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  3. #123
    chuck sengstock is offline Cadillac Owners Member
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    Re: 99 STS Running Hot

    I am confused. Please tell me what I should expect and/or is considered an acceptable opearting temp range for my Northstar.

    - Ranger said: Normal operating temperature is 205-215.

    - Submariner 409 said: The desired GM operating range for the engine is 195 to 225.

    Mine runs 216-219 on the highway and 223-228 in the city/while idling.

  4. #124
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 99 STS Running Hot

    i would call that just a little on the hot side, but not really much to worry about if it doesn't go any higher
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  5. #125
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    Re: 99 STS Running Hot

    Normal operating temp is anywhere near 188-224, since 188 is when your thermostat starts opening up and 224 is when the fan goes on slow. 228 is in a bit of a high side, try cleaning up the bugs and road grime stuck in the fins of the condenser/radiator with compressed air. Top radiator cover, the bottom splash shield and the flaps around the radiator are required since it will direct all the frontal air flow through the condenser/radiator rather than going around it. See if both fans are correctly working, they both should start turning slow when the temp hits 222-224.

  6. #126
    chuck sengstock is offline Cadillac Owners Member
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    Re: 99 STS Running Hot

    Thanks, I will do that. It only hits 228 when parked and idling (which I do not let it do much of) but then drops back to 225 or 226 then back up, etc.

  7. #127
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 STS Running Hot

    I say 205-215 because that is what I observed for for many years on my digidash '97. A consistent 205 in the summer to 215 in the winter. That said, 12:00 = 188-215.

  8. #128
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Huh?
    maeng9981 and maeng9981 like this.

  9. #129
    RippyPartsDept's Avatar
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    Re: 99 STS Running Hot

    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
    Rippy is a Cadillac, Hummer, Saturn & Saab dealership & Official Saab Service Center
    ~~ Family owned and operated in Wilmington, NC since 1946 ~~
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  10. #130
    Ranger's Avatar
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    Re: 99 STS Running Hot

    Me Too?

  11. #131
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 99 STS Running Hot

    The previous questioning posts refer to earlier deleted posts containing trolling and insults to members. Posted insults are cause for infraction and may lead to a temporary or permanent ban.

    Please stay on topic and leave the personal pot shots out of CF. Thanks.

  12. #132
    cadillaczac's Avatar
    cadillaczac is offline Cadillac Owners Member
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    Re: 99 STS Running Hot

    I also own a 99 sts (157,000 miles) and am having a cooling problem - there are so many threads about it on here its hard to find a good one. This one was pretty helpful so far so here goes:

    When it is really hot outside, 90+ degrees, and when idling in stop-and-go traffic, the temperature gage will tick half a notch past vertical, normal operating temp. You can also start to smell that sweet cooked-coolant smell. Once I start moving again, the temp goes back to normal. It has been doing this the past three summers I have owned it, and it has never heated more than one notch past normal temp. On long highway trips, it never heats up.

    The past two days, it started doing this when the weather was cooler, 70-75 degrees outside. I'm now a bit worried...

    So after reading this post, I checked my purge line and it is flowing coolant just fine. The water pump is turning and the belt is in good shape and taut.

    I did notice the upper cooling hose from the pump to the top of the radiator was hanging below it's normal place and was touching the water pump tensioner pulley. The hose is worn through the outer layer and will be replaced asap, but it still holds water with no leaks. The coolant reservoir stays full.

    I then let the car warm up to operating temp, and revved it until the temp ticked over. I noticed both fans stay off completely until the temp ticked over half a notch. They then both came on at full speed, and once the temp went back down both shut off again. I let it warm up again and the same thing happened.

    So, is this fan operation normal? The fuses looked ok. It doesn't seem right for a car to start to overheat before the fans kick on.

    Should I be worried or am I over-reacting? Beginning stages of HG failure?

    Other things to note, the car has DEX-Cool in it, and one year ago it was leaking coolant (1-1.5 liters a week) so I added some radiator stop-leak. It hasn't leaked coolant since.

    Sorry for the novel, but any advice would be appreciated.

  13. #133
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 STS Running Hot

    One half tick past 12:00 is nothing to be too concerned over, especially if it has been happening for 3 years. Probably normal for your car.

    If you smell coolant, you have an external leak somewhere.

    Your fan operation sounds normal. They don't come on until about 224 degrees.

  14. #134
    cadillaczac's Avatar
    cadillaczac is offline Cadillac Owners Member
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    Re: 99 STS Running Hot

    Well ok then, I'll just keep an eye on it I guess.

    Thanks!

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