Cadillac Northstar Engine

Check out the short video of Cadillacs’ with Northstar engines being repaired.

Northstar-Cooling System Modification Kitis included in the repair.

The Cadillac Northstar rarely exhibits typical blown head gasket symptoms.

The Northstar engine features a die-cast aluminum block and aluminum heads. Designed to produce more power than competing engines put the Northstar at risk for head gasket failure. The problem is peculiar to 1993 to 2010 models. Head gasket problems have plagued the Northstar.

Overheating problems can usually be traced to a component failure and repaired. Sometimes a mechanic checks the cooling system and finds nothing wrong. So, without any clear indication as to what’s causing the problem a mechanic may suggest replacing various cooling system components, like a radiator, water pump or thermostat. Eventually the coolant starts disappearing and it starts to overheat again.

Most Northstar engines can idle all day and not loose a drop of coolant or overheat. However, as soon as you get on the freeway the temperature starts to go up and the low coolant light appears again.

If this sounds familiar, it is time to get a proper diagnosis. An experienced Thermalweld technician can provide the fastest and most cost effective solution to your problem. Let us help you properly diagnose your Cadillac’s overheating problem and ultimately determine if you do or do not have a blown head gasket.

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Cars that came with the Cadillac Northstar Engine

Year Model

1993 Cadillac Allanté

1993-1994 Cadillac Eldorado ETC

1995-2002 Cadillac Eldorado ETC

1993 Cadillac Seville STS

1994-2004 Cadillac Seville STS

1996-2004 Cadillac DeVille Concours/DTS

2005 Cadillac DeVille DTS

2006-present Cadillac DTS Performance

2008-present Buick Lucerne Super

1994 Cadillac Eldorado

1995-2001 Cadillac Eldorado

2002 Cadillac Eldorado

1994 Cadillac Seville SLS

1995-2001 Cadillac Seville SLS

2002-2004 Cadillac Seville SLS

1994 Cadillac DeVille Concours

1995 Cadillac DeVille Concours

1996-2001 Cadillac DeVille

2002-2005 Cadillac DeVille

2006-present Cadillac DTS

2004-2005 Pontiac Bonneville GXP

2006-2007 Buick Lucerne CXS

2004-2009 Cadillac SRX

2004-2009 Cadillac XLR

2005-2010 Cadillac STS

2006-2009 Cadillac STS-V

2006-2009 Cadillac XLR-V

1995-2003 Oldsmobile Aurora

1999-2005 Shelby Series 1

1999-2002 Oldsmobile Intrigue

2001-2002 Oldsmobile Aurora




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