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98 Cadillac D Elagence over heating

Over heating replaced the thermostat and flushed the engine with blue devil. Still overheating. Water pump?

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  • Cadillac Master
  • 44,372 Answers

Have a compression test done to check for head gasket or cracks . Have a flow test done on the radiator to check for blocked cores . Water pumps seldom cause overheating unless you have the wrong size pulley fitted.

Posted on Mar 21, 2014

  • Bill Boyd Mar 21, 2014

    if you have a viscous fan hib fitted then replace it as it is not working properly.

  • Bill Boyd Mar 26, 2014

    what marks says has merit. -- A thermostat is in the cooling system to regulate the flow of coolant through the radiator cores to allow maximum heat transfer to the air flow. Without the thermostat the coolant flow is uncintrolled and so the temperature of the water steadily increases instead of being maintained in relation to the load placed on the engine

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Posted on Jan 02, 2017

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Kravcar
  • 192 Answers

SOURCE: 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.

Posted on Aug 22, 2009

  • 5 Answers

SOURCE: 1966 Ford Mustang overheating

try to run the water pump without hoses, and add water in the 'in' side, if is powers out the other side, then it's fine. how is your water/coolant mix?

Posted on Dec 01, 2008

  • 11 Answers

SOURCE: replaced water pump. thermostat. radiator, filled

Try backflushing,if this doesn't solve the problem,..then it could be the distributor,they can make the car run hot if the are going out.

Posted on Apr 13, 2009

  • 574 Answers

SOURCE: 98 cadillac seville 4.6 overheating

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

  • 610 Answers

SOURCE: 99 cadillac deville engine overheating an loosing

Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!

Posted on May 12, 2011

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1 Answer

Why did my 2011 DTS Cadillac overheat?


An overheated engine can be caused by anything that decreases the cooling system's ability to absorb, transport and dissipate heat; therefore engines can overheat for a variety of reasons. Let's take a look at some of the most common causes.
Cooling System Leaks
This is the primary cause of engine overheating. Possible leak points include hoses, the radiator, water pump, thermostat housing, heater core, head gasket, freeze plugs, automatic transmission oil cooler, cylinder heads and block. Perform a pressure test. A leak-free system should hold pressure for at least one minute.
Wrong Coolant Concentration
Be sure to use the coolant recommended by your vehicle's manufacturer. The wrong type of coolant and/or mixing the incorrect concentration of coolant and distilled water can also result in engine overheating. The best bet is to perform a complete flush and fill.
Bad Thermostat
A thermostat is a heat-sensitive valve that opens and closes in response to engine temperature. Heated engine coolant passes through to the radiator when the thermostat is in the open position. In the closed position, it prevents the flow of coolant to speed up the warming of a cold engine. When the thermostat gets stuck in the closed position, coolant stays in the engine and quickly becomes overheated, resulting in engine overheating.
Blocked Coolant Passageways
Rust, dirt and sediment can all block or greatly impede the flow of coolant through the cooling system. This can limit the system's ability to control engine temperature, which may result in higher operating temperatures and engine overheating. Once again, a flush and fill is recommended to remove debris.
Faulty Radiator
By passing through a series of tubes and fins, coolant temperature is reduced in the radiator. Leaks and clogging are some of the most common causes of radiator failure. Any disruption in the radiator's function can lead to elevated engine temperature and overheating.
Worn/Burst Hoses
A hose that contains visual cracks or holes, or has burst will result in leaks and disrupt the flow of engine coolant. This can result in overheating.
Bad Radiator Fan
A fan blows air across the radiator fins to assist in reducing the temperature of the coolant. A fan that wobbles, spins freely when the engine is off, or has broken shrouds will not be able to reduce the temperature to proper level, thus possibly resulting in engine overheating.
Loose or Broken Belt
A belt is often the driving link that turns the water pump at the correct speed for proper coolant flow through the cooling system. If a belt is loose or broken, it cannot maintain the proper speed, thus resulting in poor coolant flow and ultimately, engine overheating.
Faulty Water Pump
Known as the 'heart' of the cooling system, the water pump is responsible for pressurizing and propelling engine coolant through the cooling system. Any malfunction of the water pump, including eroded impeller vanes, seepage or wobble in the pump shaft, can prevent adequate coolant flow and result in engine overheating.

Oct 13, 2016 | 2011 Cadillac DTS

1 Answer

My engine is overheating. 98 Olds Silhouette. I changed thermostat, thanks to Fix ya.com assistance. now engine is still overheating. Are my next steps checking and or changing the water pump? Or am I...


Alway worry about the head gasket. Run it if you fell water running threw the lines(check all of them)it may not be the pump. Check water levels. If you fell water running and dont see water on the ground check to see if the fan is kicking on. You may just have to do a heavy flush. Now it if the temp is running cooler but still hot you have to replace the thermostat again the wax after it over heats breaks down. If its still running hot there go to your parts store and rent a code meter. It helps some times Good luck

Sep 11, 2012 | 1998 Oldsmobile Silhouette

1 Answer

98 caddy deville overheating changed the water pump and thermostat


Run the car without the thermostad to see if it still overheats. If so check the heat sensor it might be faulty.

Aug 01, 2012 | 1998 Cadillac DeVille

2 Answers

1998 cadillac catera oil pressure light come and and the car overheats when sitting in traffic....


CHECK ENGINE OIL LEVEL SHOULD BE ON THE FULL MARK ON ENGINE DIP STICK. IF OIL LEVEL IS LOW.LOOK FOR OIL LEAKS UNDERNEATH CAR.IF ENGINE NOT LEAKING OIL CHECK OIL PRESSURE SHOULD BE 22 PSI @ 900 RPM IF NOT OIL PUMP FAULTY OR YOU HAVE WORN ENGINE BEARINGS.IF OIL PRESSURE OKAY YOU COULD HAVE FAULTY OIL PRESSURE SENDING UNIT. CHECK COOLING FAN TO SEE IF CAR COOLING FANS RUNNING WHILE ENGINE OVERHEATING.IF NO CHECK COOLING FANS RELAY AND FUSE IF ALL IS GOOD ENGINE COOLANT TEMPERATURE SENSOR FAULTY. IF COOLING FANS RUNNING WHILE ENGINE OVERHEATING.HAVE RADIATOR AND ENGINE FLUSHED OUT. REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.

Jun 12, 2011 | Cadillac Catera Cars & Trucks

1 Answer

MY CADILLAC IS OVERHEATING I HAVE ALREADY REPLACED THE WATER PUMP AND THERMOSTAT BUT IT STILL IS OVERHEATING. I ALSO HAD A BLOWN HEAD GASKET SO I BOUGHT SOME BLUE DEVIL AND DID ALL I WAS SUPPOSE TO FOR...


BLOWN HEAD GASKET IS THE PROBLEM CANT PATCH UP WITH STOP LEAK PRODUCTS WHICH WILL STOP RADIATOR CORES AND HEATER CORES UP PROMOTING OVERHEATING.HEADGASKET LEAKS HAS TO BE FIX.IT GOING TO COST SOME MONEY.

Jun 02, 2010 | 1998 Cadillac DeVille

3 Answers

Our 01 devill dts is overheating new radiaor,


That car holds 8 quarts of oil. Thats why its still low. You may have head gasket problems. Find a shop that is familiar with your Northstar engine, its going to be big bucks.

Mar 11, 2010 | 2001 Cadillac DeVille

1 Answer

Hi Honda crv (98) R overheating.


SOUNDS LIKE YOUR THERMOSTAT IS STICKING,REPLACE THERMOSTAT FIRST OVERHEATING WILL DAMAGE ENGINE.IF THAT DOSEN'T WORK HAVE WATER PUMP CHECKED.FANS WON'T TURN ON IF HEAT FROM ENGINE IS NOT FLOWING INTO RAD BECAUSE THEROMOSTAT STUCK CLOSED,OR WATER PUMP FAILING

Jan 28, 2010 | 1998 Honda CR-V

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

Car over heating/ running hot


Your radiator might have a clog and needs to be flushed...also check your water pump to see if its working right.

Sep 02, 2009 | 1998 Cadillac DeVille

1 Answer

98 Jeep Overheating


I think you may need a new radiator core.Flushing can only do so much and if the core is badly blocked no ammount of flushing will solve the problem. You could also chech there is no air in the system by undoing one of the heater hoses on the engine. Make sure there is no problem with the bellts and the water pump is spinning. Also check the water pump for any leaks or wobble on the shaft. If the impeller is bady corroded you can have heating problems.

Aug 17, 2009 | 1998 Jeep Cherokee

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