Question about 1993 Cadillac Eldorado

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Overheating I have a 1993 cadillac eldorado with the 4.9 northstar engine and it is overheating. How do i stop the car from overheating?

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  • Tim Brown
    Tim Brown May 11, 2010

    hows the coolant level. check when its warm or cold. not when its overheating. the cap will explode off and youll be burnd. If your coolant is very low check for leaks. If not then you need to check for flow to see if your thermostat is opening or closing. and see if your coolant fans are woking.

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  • Master
  • 607 Answers

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.

Posted on Apr 16, 2009

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1 Answer

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are you familiar with the northstar engine?
first generation northstars are notorious for this kind of thing..
the engine is prone for metal fatigue/ warping of the heads, and stripped out head bolts, do you have documentation and service history for it?
these engines need a good mechanic to inspect and replace head bolts which strip out and need fixing. I will post a link at the bottom
once the engine is repaired correctly it should last a good long time
have it fixed correctly. I think someone has turned up the idle knob in an attempt to get the coolant flowing quicker to keep it cool.
its worth repairing if you have the money..

jm

http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/976-overheating-northstar.html

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1 Answer

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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.

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1 Answer

Overheating


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