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Thread: Over heating problems on a STS northstar.

  1. #16
    stoveguyy is offline Cadillac Owners Connoisseur
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    Ton of stop leak? Flush out radiator next? That's cheap. Almost free if you do it.


  2. #17
    bikerbobby is offline Cadillac Owners Member
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    Re: Over heating problems

    I'd like to know what kind of diagnosing your talking about that I haven't already done to it. If something passes a block test the first two time, the coolant tank and t-stat were replaced and a flush did no good then what else can I try. I figured the stop leak had plugged up the radiator so bad that it couldn't be flushed out. So I replaced it and the water pump. After I replaced the clogged radiator, it opened up the passages and it failed the block test right off he bat. So it looks like I have a very expensive boat anchor in my driveway. Thanks

  3. #18
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Over heating problems

    Why did you replace the WP? If it wasn't leaking and was spinning, it was good. Why replace the surge tank if it wasn't leaking?

    It just gets kind of frustrating to see people have an overheat problem and then start "throwing parts at it" hoping one will solve it. We see it all the time. So now you have this "boat anchor" with new parts. It ain't my money, but I still hate to see you add insult to injury.

    In post #1 you said it passed the block test. A clogged radiator would not give a false negative on the test. If it failed with one radiator, it will fail with the other.

  4. #19
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Over heating problems

    Why did you replace the WP? If it wasn't leaking and was spinning, it was good. Why replace the surge tank if it wasn't leaking?

    It just gets kind of frustrating to see people have an overheat problem and then start "throwing parts at it" hoping one will solve it. We see it all the time. So now you have this "boat anchor" with new parts. It ain't my money, but I still hate to see you add insult to injury.

    In post #1 you said it passed the block test. A clogged radiator would not give a false negative on the test. If it failed with one radiator, it will fail with the other.

  5. #20
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Over heating problems on a STS northstar.

    Bump !!! and moved to the proper Seville forum.

  6. #21
    lorain is offline Cadillac Owners Member
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    Re: Over heating problems on a STS northstar.

    Only overheating on stop? Or while in full cruise? If only at stop, could indicate weak radiator fans. Fans may not be toggling at all if relay is bad. Only a few bucks to replace that. About $50 per fan motor. $40 for fan control module if you need that. Also, replace radiator cap and check thoroughly for leaks. Coolant needs to pressurize to increase the boiling temperature. The radiator cap regulates the pressure. Also only cost you a few bucks. Using the right coolant could have an effect, also, as antifreeze also raises the boiling temp of coolant (in addition to providing anti-freezing properties). Check also to see if you're running too lean of fuel mixture or improper ignition timing (if you have distributor). Quick temporary fix for running lean is adding higher octane gas (not necessarily good for engines that don't compensate automatically by PCM but will burn slightly cooler). Just some random ideas. Did you use a good brand of water pump? I've had off brands of water pump fail instantly on smaller engines. May be working, but weak. I would check the water pump serpentine belt and make sure it's tight enough as well.

  7. #22
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Over heating problems on a STS northstar.

    Please DO NOT Double Post


  8. #23
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Over heating problems on a STS northstar.

    Merged with duplicate thread/posts. Now it's all in one place. bikerbobby, as requested, please don't double post - keep all questions on the same problem in the same thread.

  9. #24
    Shaker68 is offline Cadillac Owners Member
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    Re: Over heating problems on a STS northstar.

    I had overheating problems caused by a plugged heater core. Found that out after replacing the usual suspects with no results.

  10. #25
    Moneypit is offline Cadillac Owners Fanatic
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    Re: Over heating problems on a STS northstar.

    It might be a defective surge tank cap. If it doesn't hold pressure coolant will escape thru the the tube just beneath the cap. When enough coolant escapes it will over heat. If that is the problem, it is a cheap fix. Also, have you checked the heater hoses for leaks?

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