Question about 1998 Cadillac DeVille

1 Answer

98 deville 32 valve North Star OVERHEATS after 33 miles of drive ?? does not overheat in town overheats out on highway and after slowing down- fans dont cool motor unless stop engine ,have changed radiator and thermostat, cooling fans do NOT operate after engine turned off w/ ignition key OFF and have high temp - 244 degrees

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 192 Answers

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

Posted on Jul 17, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2000 malibu overheats on highway but not in town or when idling


check the tension of the fan belt. also make sure there is no debris on the radiator.

Aug 26, 2012 | Chevrolet Chevy Cars & Trucks

1 Answer

I have a 98 DeVille and it's overheating with some moisture coming out the tail pipe, but no oil and water mixture. There is no visual leaks at the moment. I just bought the car and test drove the


For car running hot and overheating issues, I suggest to you go through this help links.

Click this link below and go through the troubleshooting procedure to take care of the problems: ----



Car runs hot?

http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------

All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
---------

Car freeze overnight and started overheating while driving?

http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html

-----------



Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------

Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------

overheating?

http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------

Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

Feb 03, 2012 | 1998 Cadillac DeVille

1 Answer

I may have added too much coolant. After adding it, I drove for about 15 minutes. A few hours later, the tempurature gauge light came on. I check the coolant level again and there was nothing in the...


No, you can't add too much coolant. Rather, it does not hurt anything if you do. Did you add it to the radiator, or to the overflow tank?

Let it cool, then remove the radiator cap, and if needed, add coolant to the radiator. Put the cap back on, and fill the overflow tank to the "full - cold" line. Start it and run it a few minutes and look for leaks. If you find no leaks, drive it for a day or two, then let it cool and check it again. If it is down a lot (without overheating), you have a leak somewhere. If you lose enough coolant, that will make it overheat. However, if it overheats, that can cause loss of coolant, when you stop the car, you will see steam and smell coolant, and often hear it boiling.

If it overheats again, make note of when it happens: driving on the highway, or stop-and-go around town. Overheating on the highway usually indicates a clogged radiator, while in-town overheating usually indicates a bad cooling fan (you don't need the fan above about 30 MPH). A bad fan is usually the fan relay, but it can be the fan thermostat (different from the engine thermostat), or a bad fan motor.

Oct 10, 2010 | 1999 Chevrolet Malibu

2 Answers

Overheating I change waterpump, thermostat, flush radiator, change drivebelt, radiator cap radiator hose and it still overheat when i drive it on highway it dont overheat just driving in town it overheats


Two things you can check: First pull your oil dipstick and make sure that the oil is clear and not cloudy or milky, if it is you have a blown head gasket. Secondly if the vehicle has an electric fan make sure that it is coming on. You can do this by starting up the vehicle and letting it warm up for 10min or so or until the guage shows that it is hot. Then look under the hood to see if the fan is turning, you may have to watch it for a few min because they will cycle on and off. If the fan doesn't come on, that is why it overheats in town because it is not getting enough airflow across the radiator. If the fan does not come on you can start troubleshooting it by checking the fuses and relays in the dash and under the hood. If the relays and fuses are good and the fan still won't come on, with the key on and engine off, carefully wiggle the wire that goes into the fan, these sometimes make bad connections, but again be careful because if that is the issue the fan will begin spinning so watch your hands and fingers.

Sep 22, 2010 | Chevrolet C1500 Cars & Trucks

1 Answer

Does the hose on the fill tank need a clamp or not? why does vechile overheat if the fill tank on the side is full?


A clamp might not be needed, this is not under pressure. It would not hurt to have one, but a simple spring clamp is adequate.
A vehicle can overheat for many reasons. When does it overheat most? During periods of slow speed, stop-and-go, and idling? Or during long high-speed drives on the highway?

If it is mostly idle and slow speed, check your cooling fan. Mostly they are thermostatically controlled, only turning on when needed. If this does not work, check the fan relay, fan motor, and fan thermostat.

If it overheats mostly at high speed, it is most likely that the radiator is partially plugged and needs to be backflushed, rodded, or replaced.

If it always overheats quickly after startup (less than fifteen minutes) it may be that your thermostat is not opening properly.

Aug 24, 2010 | 1992 Ford Explorer

2 Answers

98 Camero overheats when driving slow or stop, ok


You need to get the cooling fan checked,it may need a temperature sensor,fan relay or the fan motor may be burnt out.You can check the fan by running your own power and ground to the plug that comes out of the fan motor,unplug it and put the ground to the black wire and positive power to the other one,if it works then the next step would be to check the fan relay.The most common problem if the fan doesn't work but can be made to work with jumper wires is the temperature sensor,you can check it by unplugging it and jumping the wires in the plug.If the rad fans work then you are down to either the water pump or a plugged radiator,a rad shop should be able to narrow it down for you.

Jul 14, 2010 | 1998 Chevrolet Camaro

1 Answer

I have a 96 Cadillac Deville. The car overheats


i would get a radiator tester to make sure there is no air leaking out at a slow rate

May 05, 2010 | 1996 Cadillac DeVille

2 Answers

Vitara overheat


When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.

Jul 12, 2009 | 1999 Suzuki Vitara

1 Answer

2004 Dodge Ram 3.7L Overheating


is the a/c running or not??
if it is check to be sure the auxiliary fan comes on when you turn the a/c on!!!
if thats ok then it's probably your fan clutch!!!

Jun 17, 2009 | 2004 Dodge Ram

2 Answers

High mileage 1996 Ford Explorer v8 overheats at 75-80 mph


if your mechanic seen no leaks from hoses or thermostat housing its sounds that either your fan clutch or your thermostat is bad. if its heats will driving streets and not highway its your fan clutch and needs to be replaced. if it overheats in streets and highway its your thermostat and needs to be replaced,you will need a thermostat and gasket with some silicone. Drain, follow the radiator hose to the housing and take 3 bolt off, clean housing well,CAREFULLY install the t-stat exactly the way is was taken out (pic), gasket,sillicone, bolt. ecc3d0c.jpg   its an easy job. Good luck!

Apr 27, 2009 | 1996 Ford Explorer

Not finding what you are looking for?
1998 Cadillac DeVille Logo

1,069 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

75066 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7754 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...