Question about 1998 Cadillac DeVille

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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

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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 Apr 30, 2010

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Northstar motor? head gaskets around 80,000 miles. the usual fix is a replacement engine, cuz when you take the head bolts out, 90% of the time they take the threads out of the engine block with them. i think a code 301 is a misfire code, most likely a blown head gasket.

Posted on Mar 24, 2010

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Junk these pieces of ****!!

Posted on Jul 12, 2011

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301 is a misfire with spark and 1258 is engine metal over temperature protection. Have this engine checked out fairly quick before any major damage can occur

Posted on Mar 24, 2010

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