Question about 1997 Cadillac DeVille

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Crapy cadillac northstar overheating

By hollywood : do it right i dont care what TOM ,**** Or HARRY has to say R E P L A C E T H E H E A D G A S K E T THE END
ALL BETTER. change the radiator 400.00 why not its not to bad , oh ya try all thoses STUPID POUR IN REBUILD IN A CAN LIQUIDS,
THAY DONT WORK .
ONE COMPAINY GIVES U MONEY BACK GARANTEE , ONLY WITH
PROOF OF U JUNKING YOUR CAR www heal-a-seal.com
it cost 198.00 for one northstare treatment.
BUYER BEWARE.

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Do you definitely have a blown head gasket?.......

You are absolutely right to avoid those gasket seal products, they will also f*%k up your cooling system big time.

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Many northstar engines have been misdiagnosed because of this simple blockage.
Many dealers and experienced mechanics fail to check it.

Posted on Sep 13, 2009

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2 Answers

Are there any major problems with the Northstar 4.6L v8 2005?


Ours was delivered new with a cracked block. Was fine after replacement.

Sep 30, 2015 | Cars & Trucks

1 Answer

2000 cadillac northstar running hot


I just had to rebuild my wife's Northstar. You have a bad head gasket. Her's was doing the same thing, and not showing traditional signs of head gasket problem. (IE: white smoke) It was just overheating with normal use.

Aug 22, 2010 | 2000 Cadillac DeVille

1 Answer

1997 cadillac deville engine is overheating. can your ''thermagasket kit'', be used on 4.6L northstar 32 valve V8 engine. If so, approximately how long will the treatment last and how much does it cost?


When you say thermagasket kit,I assume you mean one of those silly DIY gasket sealant liquids that you put in the engine.

You should not use these type of products on ANY engine let alone the Northstar.

To cure a headgasket leak, replace the headgasket.....there is no miracle cure.

On the Northstar, you will damage the cooling system,plus you will continue to have issues as time goes on.

How do you know you have a blown head gasket?

Here is something to consider.......

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

May 31, 2010 | 1997 Cadillac DeVille

4 Answers

My 98 cadillac runs hot within 10mins replaced therm. and i dont have smoke gushing out of pipes,diagnosed it and came up with codes po301 and 1258severity unknown what can i do to stop overheating


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Mar 24, 2010 | 1998 Cadillac DeVille

1 Answer

My 1994 SLS Cadillac v.8 4.6L 32 northstar never overheated until the lower water hose began leaking, i replaced it and its still overheating can u explain???


YOUR LOWER HOSE LEAK COULD BEEN WATER PUMP WEEP HOLE LEAKING.OVER HEATING PROBLEM COULD BE WATER PUMP GOING BAD.MAKE SURE YOU HAVE CORRECT AMOUNT OF COOLANT IN COOLANT SYSTEM.

Mar 01, 2010 | 1994 Cadillac Seville

2 Answers

My 1996 cadillac sts is overheating.. ook how do i get air out of it


There is no need to purge the air out of the cooling system as it is self purging on the northstar engine.
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank or trace the hose further back until you locate the blockage.

Oct 21, 2009 | 1996 Cadillac Seville CA Value

2 Answers

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the useual problem with this engine is the head gasket leaking, that sounds like what is going on with your Northstar.

Aug 16, 2009 | Cadillac STS Cars & Trucks

2 Answers

Engine overheats after i had radiater put in


do me a favor and pull the sparkplugs out get a compression gadge and do compression tests on all the cylinders they should be within ten psi of each other if not yes you have either a cracked head or a blown head gasket

Jun 22, 2009 | 1994 Cadillac DeVille

1 Answer

1993 Cadillac Eldorado overheating


I am assuming you have the Northstar engine.

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Are you running it without a thermostat? If so,then strangely enough,this will cause overheating as the Northstar cooling system is different to most conventional systems and therefore will not help you diagnose the problem.

May 29, 2009 | 1993 Cadillac Eldorado

1 Answer

Overheating


Many items need assessment. First what is THE COOLANT LEVEL enine running from cold start. IF LOW . Is there a coolant leak and where ? Lets say all of the previous check OK. ARE THE COOLING FANS OPERATING ? . They are , GREAT. Is it possible the cooling system ( i.e. radiator ) is clogged internally, or blocked exterior cooling fins of the radiator restricting cooling air. Hope this helps.

Apr 16, 2009 | 1993 Cadillac Eldorado

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