Question about 1998 Cadillac DeVille

1 Answer

My Cadillac overheats if put onto the highway. It was running fine after putting in a quick fix called thermagasket due to the car overheating after just a few block drive. This fix began to fail approx. 3 weeks after installation. It doesn't lokk like it's a head gasket. The car rubs too smooth with no mixture of oil, water or antifreeze. I am wondering if anyone can help me. It has been tested with no code for the coolant system.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cadillac Master
  • 4,336 Answers

Yippers, what happens is compression comes into the coolingsystem and that blows out the coolant.. Been there, done that, very costly to fix correctly. Issue is with head studs, they pull out of the aluminum block. Needs bare block on bench to fix correctly... Measure for exhaust in cooling system, and you confirm the bad news.

Sorry, I did mine, but waaaay too much money to do it

Posted on Sep 04, 2010

  • steveneddy Dec 13, 2010

    These year model Cadillacs with the NorthStar engine have issues with crack/warped cylinder heads and head bolt threads coming literally out of the engine block.

    This was a poor engine design at best. The best advise would be to sell the vehicle and take your losses. There are better Cadillacs out there - most of the best ones are from 2006 and up.

×

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

Chrysler sebring 01 overheats very quickly. I have replaced radiator, thermostat. It ran fine for about a week. Overheated again. Did a radiator flush due to rust in radiator. I was having to put water...


If your having to put that much water in it I would lean towards a bad head gasket your other symptoms would make me think possible water pump. I'd check them both 1 of the 2 is most likely the prob or possiobly both. Good luck.

Oct 31, 2012 | Cars & Trucks

1 Answer

We need help with an overheating problem on our 1999 Cadillac DeVille. We've replaced many parts and wonder if it may be air in the cooling system. Please help.


Could be.
Has the thermostat been replaced ?
You could run the engine without the radiator cap to see if the system has air pockets.
A restriction in the exhaust could cause the engine to run hotter on the road than on short trips.

Aug 04, 2012 | 1999 Cadillac DeVille

1 Answer

Can running a qt oil low cause spike in temperature cool down. Was 222 now 228 and scaring me. Thinking about trying Thermagasket for head leak.


Running one quart of oil will not cause engine to overheat under normal conditions. If you suspect you have a blown head gasket no product such as Thermagasket will fix this problem. You will need a new head gasket installed. A compression test will verify if you indeed have a blown gasket. If you are loosing coolant with no apparent leak, see white smoke from the exhaust, see a grey foamy substance on the underside of the oil fill cap, you probably have a blown head gasket. You need to have this looked at by a professional or you may destroy your engine.

Sep 21, 2011 | 1998 Cadillac DeVille

4 Answers

Overheating - 1999 Cadillac Deville D'elegance dealer mechanics can't find the problem. They've replaced the thermostat and checked the waterpump - did the head gasket test and it passed. The...


is the cooling fan operating properly(on and off at proper temps),does the rad have a flow problem this can cause it as well.you don`t say when and how long it takes to overheat.sitting idling for long periods of time,driving in the city only,on the highway,coming off the highway,only on acceleration,only with the a/c on.all these factors can make a difference in finding the problem.have you told the shop when and how its overheating.you may have to drive it under the same situation to get it to over heat and take it to the dealer and have them check it out when its happening or take it to a shop as dealer techs won`t spend as much time on it as they should because they are paid flat rate and if nothing shows in short order they kick it out the door and move onto a paying job.

Jun 21, 2011 | 1999 Cadillac DeVille

1 Answer

1997 cadillac deville engine is overheating. can your ''thermagasket kit'', be used on 4.6L northstar 32 valve V8 engine. If so, approximately how long will the treatment last and how much does it cost?


When you say thermagasket kit,I assume you mean one of those silly DIY gasket sealant liquids that you put in the engine.

You should not use these type of products on ANY engine let alone the Northstar.

To cure a headgasket leak, replace the headgasket.....there is no miracle cure.

On the Northstar, you will damage the cooling system,plus you will continue to have issues as time goes on.

How do you know you have a blown head gasket?

Here is something to consider.......

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.

May 31, 2010 | 1997 Cadillac DeVille

3 Answers

How to tell if water pump for 04 cadillac srx needs to be replaced.


Your car will overheat very fast and you may either notice coolant leaking from the location of the pump and also possibly a squealing noise due to a bad bearing. Overheating can also be caused by a bad thermostat.

Feb 17, 2010 | 2004 Cadillac SRX

1 Answer

Same problem , car has only 86,000 miles


replace that thermostat again...flush radiator any way...then see how it runs...

Aug 28, 2009 | 1996 Cadillac DeVille

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

My 1999 Aurora keeps overheating abd the water that we keep putting in the radiator keep disappearing. We have check the fans and the waterpump and hoses for leaks. But have not found any. If I drive...


maybe possiable it is coming out of the overflow, check the cap, also make sure car runs for awhile when adding coolant to avoid any air pockets

May 07, 2009 | 1999 Oldsmobile Aurora

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

352 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

75744 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8123 Answers

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

Answer questions

Manuals & User Guides

Loading...