Question about 1998 Cadillac DeVille

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98 deville over heat when drive but not at idle

Replaced radiator,water pump,thermostat,recover tank,heater core,fan sensor,coolant sensor

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  • Cadillac Master
  • 3,679 Answers

Must be head gasket then

Posted on Mar 29, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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dennymulford
  • 1055 Answers

SOURCE: 96 Deville Overheating....TroubleShooting

did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking

Posted on Feb 26, 2009

  • 1 Answer

SOURCE: 1999 cadillac deville overheating

my husband did everything that everyone else did that had this overheating problem. It was so weird that my engine cooled at a light and heated up going down the road. I have a north star 4.6 engine and this is natorious for happening. my check engine light also came on and so I had a diagnostics done which told me my #1 injector wasn't firing , car ran like **** as well. After putting in a new water pump and plugs,ect. and realized injector was good a friend told him we could have a blown head gasket. So just to see if this was the problem I went to buy a bottle of glassbeads and the auto parts guy told us to purchase a bottle of BARS STOP LEAK BLOCK SEALER NOT RADIATOR BUT BLOCK SEALER $31.99 . He followed the directions and we waited 24 hrs. before driving it. What ever the problem was has stopped my car runs like brand new and I am loving it again. no over heating no injector problem, runs great.......I hope this helps. I know its probly a temperary fix but its a fix and now we know what the problem was. SASSY

Posted on Mar 19, 2009

duane_wong
  • 6826 Answers

SOURCE: no heat on my 98 caddy deville delegance?

The heater core may be clogged up. Or the blend door isn't functioning correctly.

Posted on Sep 20, 2010

  • 827 Answers

SOURCE: 02 deville with 140k,overheats after

you may have too much coolant in it... oddly enough,. I've seen entire cooling systems (and even the engine get replaced) and it still over heated -- when in fact it was an all of a sudden the car required a larger radiator -- and the (freaky) problem was fully solved,. in your case it may be a larger holding/ overflow tank?

Best regards
Ck

Posted on Jan 05, 2011

bluebirdmate
  • 1190 Answers

SOURCE: 92 deville I've replaced heater core heater

Hello: ONE OTHER THING YOU MIGHT DO IS GO TO A AUTO PARTS STORE AND PURCHASE A SNIFFER KIT TO CHECK YOUR COOLING SYSTEM FOR EXHAUST GASES WHEN THE ENGINE IS AT OPERATING TEMPERATURE. THE KIT COMES WITH INSTRUCTIONS. IF YOU DON'T WANT TO BUY THE KIT MOST GARGES CAN PERFORM THE CHECK. A PRESSURE CHECK MAY NOT ALWAYS SHOW A LEAK OF A HEAD GASKET

Posted on Apr 08, 2011

Testimonial: "THANK YOU FOR THE INFO. I WILL GO GET THE TEST DONE THIS WEEK. DO U THINK IT WILL HURT TO DRIVE IT . IT HAS NOT OVER HEATED "

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1996 Chevy Lumina overheats. Radiator replaced, water pump replaced, thermostat replaced, heater core bypassed, temp sensor replaced. Air blowback into the overflow tank. Looks like it is boiling but it...


Pressure in the header tank with cool water is a classic sign of head gasket blowing between cylinder and water jacket. Not bad enough to blow water into the oil yet.

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My cadi 1988 is running ruff and quit running feels like over heating but no leaks, just smells


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.MAKE SURE COOLANT NOT LOW.IF ALL IS GOOD CHECK FOR LEAKING WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP.MAKE SURE COOLING FANS RUNNING.IF ENGINE RUNNING HOT WHILE SITTING LONG TRAFFIC LINE AND COOLANT NOT RUNNING.CHECK COOLANT FAN RELAYS AND FUSE.IF ALL IS GOOD HOT WIRE MAKE SURE COOLING FAN MOTOR GOOD IF COOLING FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD.IF FAN MOTOR OKAY AND FUSE RELAYS GOOD YOU HAVE FAULTY COOLING FAN WIRING.YOU COULD HAVE BAD ENGINE COOLANT SENSOR OR FAULT IN ECM CODE SCAN TO CHECK THEM BOTH.CHECK ENGINE OIL.LOOK LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS OKAY.YOUR ENGINE BLOCK, RADIATOR AND HEATER CORE NEED FLUSHING.

Sep 20, 2011 | 1988 Cadillac Sedan DeVille

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Nov 26, 2010 | 2002 Mitsubishi Galant

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The coolant is getting hot causing the engine to overheat.


This could have several causes. Is the coolant tank full? Is the coolant relatively fresh and a 50/50 mix of water and antifreeze?
Does the heat gauge jump up to hot and then fall back rapidly at some point or just rise and keep climbing? If so, it is the thermostat. Is there a leak evident under the car? If so, it could be a bad water pump. The water pump has a small weep hole and if there is water at that point the pump needs to be replaced. If none of this is the cause, then it could be a plugged radiator or a faulty cap located on the radiator or the coolant overflow tank.

Sep 19, 2010 | 1998 Cadillac DeVille

2 Answers

No heat on my 98 caddy deville delegance?


do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

Oct 17, 2009 | 1998 Cadillac DeVille

2 Answers

Aloha,have 98 base mustang, overheating after many replacements


i would change the water pump and check for plugs in the heater core

Sep 26, 2009 | 1998 Ford Mustang

2 Answers

94 cutlass supreme is overheating,all fluids are fine. I did have someone tell me i need 3 motor mounts replaced. could this be an issue of the car overheating?


Over heating can be caused by a faulty thermostat and or weak water pump and dirty radiator and old antifreeze or the radiator fan now working when at idle but should not over heat when driving. Service the cooling system if it has never been serviced before. Replace the thermostat, buy some radiator flush to clean out the radiator and heater core. Just follow the instruction and replace the antifreeze and make sure it's a 50/50 mix water/antifreeze. If you not sure how to mix it 50/50 you can buy them 50/50 premixed. Water boils at 100'C so you need antifreeze mixed with it but antifreeze does not have the same heat transfer as water so you cannot run 100% antifreeze cause it does not transfer heat fast enough and you over heat. Good luck and hope this helps. Keep me posted, Be glad to help, once you service the cooling system and your still over heating, then we look at the water pump.

Jun 16, 2009 | 1994 Oldsmobile Cutlass Supreme

2 Answers

1991 overheating Towncar


If car heats up quickly and overheats , the problem is the thermostat. The thermostat stays closed and traps coolant in the engine untill it reaches about 185 degrees , than the thermostat opens and allows coolant to flow to the radiator where it is cooled by airflow. ( airflow while driving is usually sufficient ) while idling , or in slow trafic , the fan keeps air moving through the rad. The heater core is strictly for heat in the winter inside the car. The thermostat is the most likely cause of the problem , and even if it was good before , the overheat / boil situation likely cooked it anyways. I am assuming the water pump is still getting turned by a belt. No water circulation by pump would cause same symptom as bad thermostat. Overflow and expansion bottles are designed several different ways on different cars , but the theory is that as the engine heats up and the coolant expands , it goes to the tank. Later , as engine cools down after being shut off , coolant contracts. Radiator is replenished by coolant returning from expansion bottle.

Jun 04, 2009 | 1991 Lincoln Town Car

2 Answers

98 cad deville is running at 210 degrees


Reverse flush the cooling system and put in fresh antifreeze to -20. (20 below zero). If that doesn't help, replace the thermostat.

Mar 18, 2009 | 1998 Cadillac DeVille

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