Question about 1998 Cadillac Seville

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98 cadillac seville 4.6 overheating

Have changed thermostat, water pump, flushed system, new cap no leaks will not overheat at idle only when ran for on road for about 10 to 15 miles

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  • jrr2044 Sep 03, 2009

    Fans do work fine

  • jrr2044 Sep 03, 2009

    fans do work fine

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3 Answers

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Are your fans or fan working if not it will get hot. I assume you have electric fans or fan if so make sure when it starts to overheat the fan or fans come on if not check the fuse for the fans or relay, breaker, wiring itself.

Posted on Sep 03, 2009

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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.

Posted on Sep 05, 2009

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Make sure your radiator fans are kicking on. If they are kicking on you need to have your radiator checked for a clog. Just because you flushed the cooling system doesn't mean there isn't a clog in the radiator. It should flow a certain amount and a local radiator shop can properly test it for you.

Posted on Sep 03, 2009

  • nissmotion Sep 03, 2009

    Well if you're radiator fans are working then as far as a component problem I would take a close look at the radiator. Make sure there isn't anything obstructing the flow of air through the radiator and also have a shop check to make sure it's not clogged. If that checks out ok you may be looking at an internally leaking headgasket.

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If you have done all that, it leaves the water pump and the fan.....how long does it take for it to overheat? Does it overheat sitting at idle in the driveway?

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Check the coolant pressure cap is serviceable & of correct rating,
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Strangely enough,if you remove the thermostat in the Northstar engine, it will overheat, this is because the stat is both a thermostat and a pressure valve.I can't be bothered to explain in detail how the whole cooling system works but please understand that you need to put the stat back in,(or preferably a new one).As for the cooling fans,what you described is normal for the Northstar.
Further to this, look at my profile,I have provided similar solutions for overheating problems.

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