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Thread: Struggling with my 00 STS...

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    eldorado_97's Avatar
    eldorado_97 is offline Cadillac Owners Enthusiast
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    Question Struggling with my 00 STS...

    I have some questions that i'm hoping you guys can give me some insight on... a few weeks ago my car started overheated and we found a leaking hose and replaced the thermostat and water pump and hose of course, and ever since then the car will every day run hotter "than it used to" I understand you folks say its ok if it runs up a notch or two on the temp gauge but it never did it far this often and with cooler temperatures outside. I also noticed it was leaking around the coolant tank cap so I bought a brand new OEM cap and i'm still having the same issue. My question to you all is what can I do to fix it.. also to note if the temp is going up slightly all i have to do is accelerate the car to a higher rpm and the needle will go right back to half so I'm not really sure how to feel about this. You can literally drive the snot out of it and it wont overheat but it runs much hotter and as i said im loosing coolant out the cap.. that's just the big problem i'm still dealing with a check gas cap message and a slight shimmy.. all of witch I can take care of myself. My current codes are P 0440 (gas cap message) and P 0741 (TCC lockup) that's it that's all.. nothing else... Thank you!!! Looking forward to some reply's whether they be positive of not i'm just looking for some answers to move forward with..

    Last edited by Submariner409; 10-01-13 at 04:51 PM.

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Have you checked the purge line yet?

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    eldorado_97's Avatar
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    Re: Struggling with my 00 STS...

    See thats just it.. I checked it a while back and Im not sure if im checking the right line?

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    It's the small diameter hose running between the nipple near the top of the surge tank, and the hollow bolt/nipple near the water pump. That the one you checked?

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    eldorado_97's Avatar
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    Re: Struggling with my 00 STS...

    I checked it before this all went down but not since can I check it while the car is hot? :/

  7. #6
    MoistCabbage's Avatar
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    No, because you can't open the system while it's under pressure.

    When it's cold, remove the surge tank cap, disconnect the purge line from the tank, and hold it over the open tank hole. Start the engine. There should be a slow, steady stream.

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    eldorado_97's Avatar
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    Re: Struggling with my 00 STS...

    Ok purge line is not blocked...

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    MoistCabbage's Avatar
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    Water pump belt and tensioner in good shape? Belt not slipping at all?

    No debris on the front of the condenser?

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    eldorado_97's Avatar
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    Re: Struggling with my 00 STS...

    New belt, tensioner is good and condenser is clean I use a soft toothbrush lol

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    Re: Struggling with my 00 STS...

    a few weeks ago my car started overheated and we found a leaking hose and replaced the thermostat and water pump and hose
    Why in the world did you waste the time and money replacing a WP?


    also to note if the temp is going up slightly all i have to do is accelerate the car to a higher rpm and the needle will go right back to half
    Boy, that sure sounds like a slipping WP belt, air in the system or low coolant.

  12. #11
    eldorado_97's Avatar
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    Re: Struggling with my 00 STS...

    Sorry I forgot to say that my water pump was leaking and the thermostat gasket was all shriveled up so that's why I changed them.. I'm still betting my money on air in the system but its been almost a month now... and the other thing is occasionally I can hear like a sloshing noise in the dash heater core?

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    Re: Struggling with my 00 STS...

    Heater core noise = air in the system.

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    Re: Struggling with my 00 STS...

    Ok.. well then how do i get the air out?

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    Re: Struggling with my 00 STS...

    Make sure that the purge line is clean and the system will purge itself. If the purge line is clear and you still hear air the heater core and the engine is overheating, the "air" is being introduced to the system. Most likely by a bad HG. Might be time for a block test.

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    98cadillac is offline Cadillac Owners Fanatic
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    Re: Struggling with my 00 STS...

    Quote Originally Posted by Ranger View Post
    Make sure that the purge line is clean and the system will purge itself. If the purge line is clear and you still hear air the heater core and the engine is overheating, the "air" is being introduced to the system. Most likely by a bad HG. Might be time for a block test.
    Unfortunately, Ranger is correct. Exhaust gases are most likely coming into the system from a bad head gasket.

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