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Thread: cooling issues

  1. #1
    Join Date
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    cooling issues

    Ok caddilac gurus I'm still having cooling problems I'm not car illiterate but I've never seen a head gasket leak internal or external that you don't loose fluid so I took the t stat out and the temp still went half way up the gauge and check coolant level came up the overflow was full if gaskets need replaced are these thread serts or studs required and do you really have to pull the engine to change them please no smart comments I admit the northstar is foreign to me but I've bone a lot of auto repair from tranny rebuilds to motor rebuilds thanks for you're time


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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    What year/model?

    "Half way up the gauge" is normal. Is the car overheating?

    If the surge tank is "full" (half way up?), and the CHECK COOLANT LEVEL message is coming on, the float in the tank is stuck. You might be able to free it by removing the tank, filling it with hot water, and shaking it. Otherwise it will have to be replaced.

    If the heads are removed, you ABSOLUTELY need to use studs or inserts in all 20 head bolt holes. It is possible to insert the block with the engine in place, but much more difficult, risky, and not recommended. Studding is not possible with the engine in place, there is not enough ro to get the rear head over the studs, the firewall would be in the way.

  4. #3
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: cooling issues

    since you are asking questions on a Cadillac site -
    I GUESS you have a Cadillac of some sort -

    and since you removed the thermostat -
    it must be a water-cooled engine -

    not very much information to go on -

    ooh - another clue at the end -
    I admit the northstar is foreign to me

    I've never seen a head gasket leak
    internal or external that you don't loose fluid

    your head gaskets might not be to that stage - YET -

    check coolant level came up the overflow was full
    the proper FULL COLD level in the SERGE TANK -
    is actually about 1/2 FULL - right where is says FULL COLD -

    if the coolant IS at the proper level -
    the float in the SERGE TANK is stuck - or defective -

    if gaskets need replaced
    are these thread serts or studs required

    YES

    and do you really have to pull the engine to change them
    some have tried without removing the engine -
    at the end - MOST have said if they were to do this job again -
    they would remove the engine -

    please no smart comments
    boy - you're no fun at all -

    I admit the northstar is foreign to me
    but I've bone a lot of auto repair

    so - how often do you BONE auto repair -
    have you talked to anyone about this?

    ----------------------
    if you are concerned about failed head gaskets -

    do a COOLING SYSTEM PRESSURE TEST -

    next - do a BLOCK TEST -

    if you don't know what these are - do a SEARCH -
    they have been discussed a million times -

    oh - one more thing -
    PUNCTUATION MARKS are your/our friend -
    it helps to organize your single giant run-on sentence -

  5. #4
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
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    Re: cooling issues

    ^Yea. Did you pressure test the system?

    so - how often do you BONE auto repair -
    have you talked to anyone about this?

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: cooling issues

    .......... and a Northstar will not cool correctly without the proper thermostat in place. Yes, you MUST insert/stud all 20 cylinder block head bolt holes. The drilling, tapping, inserting and total cleanup will take a dedicated long day's work - that's AFTER the engine removal and preparation work. The GM shop rate is 22 hours in a shop with all the special tools, fixtures, parts and experienced techs. You will need a real GM/Helm shop manual because of all the special techniques, torques, and assembly procedures. A Northstar in no way resembles a Chevy 327.

    I'm having a sale on punctuation, spelling, grammar, and capital letters.

    stealth92, You might want to read the 4 threads - the sticky threads - in the Engines, Northstar Performance forum. Cooling system, temperature gauge, and Northstar head gasket failures - and repair procedures - are discussed at great length.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: cooling issues

    Quote Originally Posted by Submariner409 View Post
    I'm having a sale on punctuation, spelling, grammar, and capital letters.
    That WOULD make reading a little easier.


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