Question about 1997 Cadillac DeVille

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My 1997 DeVille onscreen dash is reading ENGINE OVERHEATED, STOP ENGINE, IDLE ENGINE COOLANT HOT and my coolant temp is at 240-260 F , I ADDED COOLANT TO THE RESEVIOR, ADDED OIL AND MY CAR WAS STILL READING THE SAME THING AND RUNNING ROUGH

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  • Cadillac Master
  • 6,927 Answers

You have most likely blown a head gasket,or cracked ,or warped a head.

Posted on Jun 04, 2010

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Sep 01, 2008 | 1997 Cadillac DeVille

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How does the coolant temp sensor function in the northstar engine?


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Sep 08, 2014 | 1997 Cadillac DeVille

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I HAVE DONE EVERYTHING FROM ENGINE HEAD CHECK PRESSURE TEST RADIATOR REPLACEMENT, THERMASTAT REPLACEMENT, WATERPUMP REPLACEMENT. THE COOLING FANS KICK IN, AND THE CAR STILL RUNS HOT ...WHAT'S NEXT?


ok , but no engine stated. which one>??
hot = lying dash gauge or real hand held pyro IR gun? a $20 tool.
did the scan tool ECT reading show too hot, Yes/no.

no new cap, really?
is the cam timed right?
is the spark timed right.?
is the ECU stuck in limphome mode? (huge heat to cylinder walls)
thermostat not upside down.
or thermostat not with bleed hole up hill trapping air below
making it lie and the dash gauge lie too, (the gauge can not measure air, period)

id not do squat with no IR gun. not me. its super accurate too.
and dirt cheap and saves burned hands,
and finds clogged rad tubes saving useless $250 new rad.
one tool. use it. and win.


i this this dang I6 engine, that loves to trap air?
had 3,now, over 500k miles on them. 1988 to present.
and never overheated but once, pin hole in heater core hose
ran bypass and drove home.
i have a 08 wrangler 6sp, 3.8L v6 , nice rig. easy to fix too.

there are 2 parts. (3 really)
engine make too much heat, (limphome or timed wrong)
air in system.
cooling system.

the rad pressure test pass and the green/blue test passes

no water in engine oil
no oil or carbon seen in the engine coolant , all places look.

how hot, ??????
200f
260F
280F"?
numbers matter, in all ofscience. they talk to you.
at what exact temp did the fans, kick in,?
the FSM shows you this, and how to do that. how to make sure the
fans kick in happen, RIGHT. some are 2 staged with A/C.
not just kick. (when)

Aug 29, 2014 | 1997 Jeep Grand Cherokee

1 Answer

How do i put water in my radiator?


you need to replace thermostat and radiator cap.look under hood around engine compartment.look for a radiator cap near radiator,add 50/50 antifreeze and water to coolant system to bring up boiling point.pure water will cause engine run hotter because water evaporate away,remove radiator pour coolant in the radiator until coolant stop dropping in the radiator now some vechicle pour coolant in the coolant overflow jug,pour coolant until coolant level stop dropping and the coolant level stay at cold full mark.start engie let idle few minutes, watch coolant level in radiator if coolant start dropping add more coolant, when coolant level stop dropping put radiator cap back on let engine idle until both top radaitor hose and bottom coolant hose get warm turn off engine wait until it get cool then take a large rag slightly open radiator just a litle at a time to keep from getting scaled.once radiator remove add more coolant if low,put radiator cap back on start the engine let it idle watch the temp gauge if temperature gauge going hot zone stop engine wait until cool then add more coolant,keep doing this until engine stop overheating going into hot zone and coolant level stop dropping,make the coolant overflow jug coolant level stay at full cold mark, dont let jug run empty if so air will get in the coolant system causing engine to overheat.

Jul 22, 2012 | 2000 Plymouth Breeze

1 Answer

My engine temp heats up when i come to a stop or i am in park? why is that?


LOW COOLANT LEVEL AND COOLANT FANS NOT TURNING ON CHECK COOLING FANS FUSE.IF FUSE IS GOOD THE COOLANT TEMPERATURE SENSOR BAD.

Jun 28, 2010 | 1997 Cadillac DeVille

1 Answer

Says coolant hot idle engine ac compressor off but coolant temp is actually only 195-205


the temp sending unit for the gauge, not the computer, is bad, or the gauge itself is bad. there may also be a fuse for that circuit

Apr 17, 2010 | 1995 Cadillac DeVille

2 Answers

Where can i find the temperture sensor


THE 4.9L ENGINES COOLANT TEMPERATURE SENSOR IS ON THE THERMOSTAT HOUSING. WHICH IS LOCATED BEHIND THE DISTRIBUTOR. THE 4.6L ENGINES COOLANT TEMPERATURE SENSOR IS LOCATED ON THE BACK SIDE ENGINE THE SIDE FACING TOWARD THE FIREWALL BELOW THE EGR VALVE.

Jan 23, 2010 | 1997 Cadillac DeVille

2 Answers

Changed thermostat and added coolant but 1997


could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
water pump?
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]

Dec 20, 2009 | 1997 Chrysler Cirrus

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1994 Cadillac Concours started displaying messages "Engine Overheated", "Coolant hot", "Stop Engine". Started giving messages intermittenly and would go away after a mile or two. Now is constant and...


it may be your ecu thats shortd out check your main relays see if they're ok, it has to be some kind of electrical thing goin on since nothin of what you stated is happenin

Nov 14, 2009 | 1997 Cadillac DeVille

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