Northstar overheating

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Northstar Engines and System Technical Discussion Discussion, Northstar overheating in Cadillac Engine Discussion; Does anyone know a way to MAKE a northstar run cooler by 20 degrees or so?...
  1. #1
    Captain Hawk is offline Cadillac Owners Member
    Automobile(s): 1998 Cadillac DeVille
    Join Date
    Aug 2013

    Northstar overheating

    Does anyone know a way to MAKE a northstar run cooler by 20 degrees or so?

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  3. #2
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
    Automobile(s): 05 STS4
    Join Date
    Nov 2010
    The CTS forum sure as hell won't know being a Northstar powered CTS doesn't exist.

    Seeing how you have a 98 that's running hot I'm just gonna assume your attempting a band aid for blown headgaskets which also doesn't exist.

  4. #3
    odthetruth's Avatar
    odthetruth is offline Moderator
    Automobile(s): 2006 CTS-V
    Join Date
    Feb 2010

    Re: Northstar overheating


    [2006 CTS-V]
    Bolt ons and Bolt ins, and Bolt underneaths.

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  6. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: Northstar overheating

    Quote Originally Posted by Captain Hawk View Post
    Does anyone know a way to MAKE a northstar run cooler by 20 degrees or so?
    There is absolutely no reason to make a Northstar run 20 degrees cooler. Why ??? .......... and consider than many emissions sensors and monitors don't even go closed loop until 160 degrees coolant temp (depending on ambient temps) and you have all the makings for destroying the cat and O2 sensors as well as running an overly rich mixture = fuel consumption = emissions codes = SES light = fail emissions testing.

    Without typing a novel the size of War and Peace, go up a couple of threads and read the sticky posts explaining the Northstar cooling system, gauge operation, and fan protocols. Then go way up ^^^ to the top black bar and study the entire Cadillac Technical Archive - most of those articles were written by the GM design engineers responsible for the systems.

    The thermostat is set to begin at 188 and fully open at 206, so the normal operating temps run between 190 - 210. The fan controls sticky will explain how and when and why fans run.

  7. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: Northstar overheating

    You want to run 20 degrees cooler than normal or cooler than what you are running at? If it's the latter, band aids won't help much or for very long.

  8. #6
    83CADMAN's Avatar
    83CADMAN is offline Cadillac Owners Fanatic
    Automobile(s): 83 Eldorado, 90 Seville, 94 Concours
    Join Date
    Jun 2009
    Pacific Northwest

    Re: Northstar overheating

    99.999% of the time:
    overheating Northstar = Failed head gasket = destroyed alum threads in the block = $$$
    There is a fix if you have the stones. Good luck.

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