Question about 1997 Cadillac DeVille
Stay away from Cadillacs with the Northstar engines.. I owned a 97 in 2009..Had everything rebuilt at Cadillac because they all seem to eat oil before it gets to the 100 thousand mile mark..this is why Cadillac was sued....These engines burn oil to nothing for no reason with no oil leaks to be found..if thats not the problem then the radiators always malfunction..type in Cadillac recalls and you will see a long list of problems..the only thing good about these cars is it will shut off the engine before you really damage it..it will give you three warning notices on the computer to pull over..then itll shut off.. i got rid of my car when it told me to pull over because of low oil pressure and when i stopped to check it,it was at the proper oil level..and this high compression engine called Northstar HAS TO ALWAYS HAVE PREMIUM gas..anything less will indeed cause these engines to malfunction..trust me.. these arent the old carburated cadillacs..
Posted on Jun 25, 2009
HI, you will know if your gasket(head) is blown if you see white smoke coming form the tail pipe during normal operating conditions like, acceleration and, idle. you may also see smoke coming ou the oil fill cap when you unscrew it after taking a long drive. this is the cause of the coolant mixing with the oil. If this is the case, replace these gaskets before the head are damaged asap.
Posted on Jun 24, 2009
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Posted on Jan 02, 2017
SOURCE: head gasket blown
there are many was a head gasket can blow . sometimes they just leak to the outside sometimes they leak to the coolant and then it blows out your antifreeze. if you have a blown head gasket you will see it when you pull the head. and yes you should hace the head checked at a machine shop and install with a new head set never reuse a gasket .
Posted on Sep 15, 2008
SOURCE: blown head gasket
I would change both, as well as use new head bolts. Make sure your heads are not warped or cracked, especially the one that is leaking. There may not be any need to change the head if it is not cracked. These are prone to blowing a gasket especially after 150K miles or so. It will not cost a huge additional amount to change both head gaskets since the engine will have to be disassembled down to the heads anyway. Hope this helps you, Rick
Posted on Apr 18, 2009
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.
Posted on Jul 02, 2010
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