Northstar overheating-Repair - Page 2
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 2 of 5 FirstFirst 1 2 3 4 5 LastLast
Results 16 to 30 of 63
Like Tree11Likes
Northstar Engines and System Technical Discussion Discussion, Northstar overheating-Repair in Cadillac Engine Technical Discussion; If your purge line is clear and you have enough coolant, check your cooling fans for proper operation....
  1. #16
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 12 Sierra, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    23
    Posts
    3,004

    Re: Northstar overheating-Repair

    If your purge line is clear and you have enough coolant, check your cooling fans for proper operation.

  2. #17
    04GrandAmGT's Avatar
    04GrandAmGT is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DTS, 04 Grand Am GT,07 Cobalt(Dont Judge,My fuel Saver)
    Join Date
    Oct 2012
    Location
    Manitoba, Canada
    Posts
    338

    Re: Northstar overheating-Repair

    Quote Originally Posted by Ranger View Post
    Why does everyone want to blame the poor WP all the time. IF THE WP SPINS, IT'S FINE.
    for some reason when i read that it made me chuckle, like the WP has feelings, but Ranger is right check the purge line, Thermostats are pretty much bullet proof on these engines, but they can go from time to time doubtfull but can, make sure yat idle your purge line has a steady stream of coolant coming through.
    Replacing the Head Gaskets on a Northstar? Use our SureGrip Cylinder Head Stud Kit!


  3. #18
    gino9's Avatar
    gino9 is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado 4.5 88' & STS 4.6 N* 01'
    Join Date
    Sep 2009
    Location
    Oxford,UK
    Age
    31
    Posts
    157
    Ok
    How can I check cooling fan?

    Is new Thermostat(old gone)
    My engine was rebulid,new seals,gasket,head stud,piston rings etc.

  4. #19
    04GrandAmGT's Avatar
    04GrandAmGT is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DTS, 04 Grand Am GT,07 Cobalt(Dont Judge,My fuel Saver)
    Join Date
    Oct 2012
    Location
    Manitoba, Canada
    Posts
    338

    Re: Northstar overheating-Repair

    Ranger or Submariner, i forget which one has a nice diagram of the temp gauge and when the fans are supposed to kick in, if you guys could post it, that would be peachy.
    Replacing the Head Gaskets on a Northstar? Use our SureGrip Cylinder Head Stud Kit!


  5. #20
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    20,411
    It's in subs albums.

    Low speed at 224 (or when any A/C function is set).
    High speed at 236.

    ----------

    Courtesy of Submariner 409:

    04GrandAmGT likes this.

  6. #21
    gino9's Avatar
    gino9 is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado 4.5 88' & STS 4.6 N* 01'
    Join Date
    Sep 2009
    Location
    Oxford,UK
    Age
    31
    Posts
    157
    I seen diagram.
    How You know when cooling fan is on speed 2?

  7. #22
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    20,411
    It'll sound different than low speed operation.

    ----------

    I have to backtrack a little. If you're testing fan operation, the car is still together and running. Correct? There's no way somebody diagnosed warped heads without removing them.

    Back to your question. If the car is overheating at idle, low speed fan operation is all it would take to keep it cool. if the fans run, your problem is not cooling fan related.

  8. #23
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    72,307

    Re: Northstar overheating-Repair

    The cooling fans run anytime the A/C is on, so turn on the A/C (or defroster if it's below 1.6C). The fans should come on.

    ----------

    Quote Originally Posted by gino9 View Post
    I seen diagram.
    How You know when cooling fan is on speed 2?
    There is no speed 2. I believe the fan speeds are infinite. Somewhat like a dimmer switch.

  9. #24
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    43,420

    Re: Northstar overheating-Repair

    Fans run in SLOW or FAST - 2 speeds.

    SLOW at 224 degrees, FAST at 236 degrees.

    Here's the 2000-2004 fan electrical circuit - SLOW speed is fans relay-set to series operation, FAST is parallel.

    Sound alone will tell you when fans shift to FAST - they move a LOT of air. It's all just above this thread in the fan operation sticky.

  10. #25
    gino9's Avatar
    gino9 is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado 4.5 88' & STS 4.6 N* 01'
    Join Date
    Sep 2009
    Location
    Oxford,UK
    Age
    31
    Posts
    157
    Today I will check purge line...
    Now some picture on my engine


    ForumRunner_20140304_151622.png



    ForumRunner_20140304_151645.png



    ForumRunner_20140304_151645.png

  11. #26
    gino9's Avatar
    gino9 is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado 4.5 88' & STS 4.6 N* 01'
    Join Date
    Sep 2009
    Location
    Oxford,UK
    Age
    31
    Posts
    157

    Re: Northstar overheating-Repair

    hi
    Today I tested again engine..
    Without A/C temperature go to 206F and back to 12 clock and again 206F and back to 12 clock(nice)
    With A/C temperature go slowly to 236F and stay there,when accelerate go back to 12 clock and again.....
    When driving always 12 clock.
    When disconnect purge line looks OK.
    Mechanic put in to cooling system GREEN antifreezer.
    Not sure yet but maybe really small leak from radiator.

  12. #27
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    72,307

    Re: Northstar overheating-Repair

    When disconnect purge line looks OK.
    Looks mean nothing. Does it flow coolant at idle?

    Mechanic put in to cooling system GREEN antifreezer.
    Was it low? If so, how low?

  13. #28
    gino9's Avatar
    gino9 is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado 4.5 88' & STS 4.6 N* 01'
    Join Date
    Sep 2009
    Location
    Oxford,UK
    Age
    31
    Posts
    157
    RANGER my engine was rebulid after HG failure.Now I would like be sure everthing is Ok.
    Yes is flow on purge line...His put green antifreezer.
    I'm not sure about temperature when idle.Should be like that what I wrote above?
    Thx

  14. #29
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    20,411
    The color of the antifreeze is irrelevant.

    How did you check the purge line flow?

    Was the coolant level low?

    Before the HGs were repaired, did you use any stop leak products?

    The repair did inure inserting or studding the block, correct?

  15. #30
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    72,307

    Re: Northstar overheating-Repair

    Quote Originally Posted by gino9 View Post
    RANGER my engine was rebulid after HG failure.Now I would like be sure everthing is Ok.
    Yes is flow on purge line...His put green antifreezer.
    I'm not sure about temperature when idle.Should be like that what I wrote above?
    Thx
    No. Running the A/C should have no effect on the temperature gauge. Mine never leaves 12:00 A/C on or A/C off. 236 is too high. The fact that it goes down when you accelerate leads me to think that there is air in the system.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting