2003 Head Gasket Repair - Page 2
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Northstar Engines and System Technical Discussion Discussion, 2003 Head Gasket Repair in Cadillac Engine Technical Discussion; The TB is held on by the 3 LONG bolts that go through to the captive nuts on the plenum. ...
  1. #16
    Submariner409's Avatar
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    Re: 2003 STS coolant leak (possible crossover leak)?

    The TB is held on by the 3 LONG bolts that go through to the captive nuts on the plenum. Look hard.

  2. #17
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    Re: 2003 STS coolant leak (possible crossover leak)?

    Quote Originally Posted by sts 03 View Post
    On the 2003 is the throttle body part of the crossover or does it separate from it?
    They are all separate.

  3. #18
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    Yea I remember the three bolts when I changed my plenum last year just couldn't remember if the tb separated from crossover , its hard to tell with all the dexcool drying up everywhere.what's the best way to clean all the dried dexcool up when I take everything apart and can the throttle cables be left connected to the tb or do the throttle cables have to come off tb when changing crossover gaskets?

  4. #19
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    Re: 2003 STS coolant leak (possible crossover leak)?

    You should be able to set the TB aside with the cables still attached.

  5. #20
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    You'll want the TB out and out of the way. The cables are easy to remove.

    I'd just use carb cleaner to clean everything up while it's apart. Dried DEX would come off with water too though.

  6. #21
    sts 03's Avatar
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    Ok thanks, anything else that should be changed as a preventive when everything is out like water pump gaskets, hoses,etc....

  7. #22
    LloydCFerguson is offline Cadillac Owners Member
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    Re: 2003 STS coolant leak (possible crossover leak)?

    I had a similar leak in my 2002 STS recently and found that it was waterpump cover. When pressurized the system, I could see coolant dripping under the car, it was difficult to tell where it was coming from but when I put a paper towel under the cover, it got soaked and the dripping stopped. GM sells the whole new style assembly (cover, gasket, thermostat housing and new thermostat), I think was around $100. It took a couple of hours to install, there is another pipe on the engine that you have to remove to get to it, you need to replace a gasket on that as well. If you nee any additional info let me know.

  8. #23
    sts 03's Avatar
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    I've been getting that water gurgling sound coming from the dash I'm guessing it's air getting into the heater core, can the leak from the crossover gasket cause that?

  9. #24
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    Any leak means air is getting into the sytstem. If coolant leaks out, air has to take it's place.

  10. #25
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    I'm about to start getting everything I need ,10&13 mm flex wrench, do I need a tool to disconnect the fuel lines? What about changing the water pump gasket and seal , is that something that should be done as a preventive? Anything else I'm missing except time?

  11. #26
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    Yes? You'll need a fuel line disconnect tool. Any parts store, cheap.

    The water pump/cover is nice and easy to get to with the crossover out, and gaskets are cheap. Personally, I would. Replacing the pump seal/O ring means you'll have to remove the pump, so you 'll need the pulp removal tool. I would suggest either replacing just the cover seal, or go all out and replace the pump as well.

  12. #27
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    Ok thanks, and those are flex head ratcheting wrenches not flex head ratcheting sockets right?

  13. #28
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    Correct.

  14. #29
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    Are fel pro gaskets fine to use or should I be using AC Delco? There is also a kit sold on rockauto that has all of the gaskets plus the ones for the throttle body , I've never heard of the brand I'll have to look it up again.

  15. #30
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    Is it Victor Reinz?

    Fel Pro is fine.

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