Cadillac Overheating Issues
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
Results 1 to 3 of 3
Northstar Engines and System Technical Discussion Discussion, Cadillac Overheating Issues in Cadillac Engine Technical Discussion; Most of the time the engine that has this problem is the Northstar. Overall this is a great engine and ...
  1. #1
    JimMayor007 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2007
    Posts
    15

    Cadillac Overheating Issues

    Most of the time the engine that has this problem is the Northstar. Overall this is a great engine and is listed in the top ten best engines. However, they are very expensive to repair. Overheating is a symptom of a larger problem, in other words, the overheating is not the problem, why it is overheating is.

    1. The Northstar has a feature known as "limp home mode." This feature allows the car to be driven without a drop of water for up to 100 miles. It accomplishes this by shutting down the cylinders in an alternating fashion, this blows outside air through the engine, hence the engine becomes air cooled instead of water cooled. You need to know that if the car is driven at high speeds or longer distances, internal engine damage will result.

    2. Overheating can be due to a myriad of things, here are a few: Blocked Radiator-usually caused by excessive dirt buildup. This is fairly easy to see and very easy to fix. Thermostat-these are designed to open and allow water through at certain temperatures, if it is not opening, overheating will result. This is rare on these cars. Clogged Radiator Inside-look inside the radiator (if you can, later models are sealed) if you can't, then look in the coolant canister, if the water or canister (if it is empty) looks muddy, usually means a sealer has been put in, this is DEATH to these engines as it clogs up the internal water ports. Head Gasket-this is fairly easy to diagnose, look at the base of the heads (will take a flashlight and some effort) if there is leaking here, the gasket is blown. Look at the oil on the dipstick, if there is antifreeze there, or if the oil looks milky or if the oil has bubbles in it, this could indicate a blown gasket, it can also indicate a cracked block. Fans-these cars have at least two fans on most models, crank the car and let it idle, the fans should come on shortly, if they do not, it is probably a relay, if one fan comes on and the other does not, it's likely the fan motor.

    These are just a few of the things you can see for yourself. Be aware however that if the car will not crank and the seller tells you it was overheating, you can plan on a new engine. This will cost you about $3,000.00 for the engine and around $2,000.00 for the removal and installation. Also the intake manifold on the Northstar is plastic and cannot be repaired, it is not included on the new engine, so plan on buying one. Of Course, you can buy an engine on ebay for less, but it will still cost you to swap the bad one.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    misfit6794 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 Deville (sold), 2000 Mustang GT
    Join Date
    Jan 2007
    Location
    Jersey
    Age
    29
    Posts
    1,300

    Re: Cadillac Overheating Issues

    Look at the oil on the dipstick, if there is antifreeze there, or if the oil looks milky or if the oil has bubbles in it, this could indicate a blown gasket
    Northstars WILL NOT have milky oil,even if the hg is blown, the oil on the dipstick will not show you if the hg is blown or not.

    The ONLY way to be sure of a blown hg is to have the coolant tested for exhaust gases or have a cylinder leak test.

    Or you can look for coolant (white smoke) in the exhaust.

    Good post though.

  4. #3
    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
    73,343

    Re: Cadillac Overheating Issues

    Lots of misinformation though.

    The Northstar has a feature known as "limp home mode." This feature allows the car to be driven without a drop of water for up to 100 miles.
    Manual says 50 miles.

    look in the coolant canister, if the water or canister (if it is empty) looks muddy, usually means a sealer has been put in, this is DEATH to these engines as it clogs up the internal water ports.
    That is normal when the sealant tabs are used. It is NOT death and does NOT clog anything but small external leaks or porous castings.

    Head Gasket-this is fairly easy to diagnose, look at the base of the heads (will take a flashlight and some effort) if there is leaking here, the gasket is blown. Look at the oil on the dipstick, if there is antifreeze there, or if the oil looks milky or if the oil has bubbles in it, this could indicate a blown gasket
    True on most other engines, but as mentioned, the Northstar rarely if ever puts coolant in the oil when a head gasket goes.

    Fans-these cars have at least two fans on most models, crank the car and let it idle, the fans should come on shortly
    The fans do not come on till the coolant temperature reaches 224 degrees or the A/C is on.

    Be aware however that if the car will not crank and the seller tells you it was overheating, you can plan on a new engine. This will cost you about $3,000.00 for the engine
    If you know where to buy a new Northstar for $3000, post it. Many people here would be greatfull.

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