Question about 2002 Cadillac Deville

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I have a 2002 cadillac deville northstar v8 with 106,000 miles & the coolant keeps bubbling back up out the coolant resovour after i changed the thermostsat. Its not leaking frm anywhere else, ive had the car since feb 2012 & its oct 2012 never had any problems until now, the heads are not leaking. i jst want to knw whats causing it to bubble back up out the coolant resovour

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  • Cadillac Master
  • 14,658 Answers

Could be a bad water pump,clogged radiator.

Posted on Aug 24, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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ginko
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SOURCE: car leaking coolant

First of all ensure that your car is leaking coolant fluid, and what is dripping is not just water condensation from the air conditioner.
If you have a coolant liquid leak, it can be from one of the ducts leading to radiator , from water pump or radiator itself. Check liquid levels, and if you have a leak have the car inspected by a qualified mechanic.
A broken water pump, for example, can cause your motor to blow in few miles.


Posted on Jun 08, 2008

emissionwiz
  • 84625 Answers

SOURCE: 2002 Cadillac Coolant sensor

The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment

Posted on Oct 08, 2008

  • 3 Answers

SOURCE: codes po174/171 cadillac deville northstar engine

These are the trouble codes description, well some what gives you a start where to look for... Auto zone will give you a print out of your codes for free in dallas...



P0170 - Fuel Trim Bank 1
P0171 - Fuel Trim System Lean Bank 1
P0172 - Fuel Trim System Rich Bank 1
P0173 - Fuel Trim Bank 2
P0174 - Fuel Trim System Lean Bank 2
P0175 - Fuel Trim System Rich Bank 2

Posted on Dec 18, 2008

emissionwiz
  • 84625 Answers

SOURCE: 1997 cadillac deville water pump

it is on the front of the engine see photo
0648479.jpg

Posted on May 09, 2009

  • 7 Answers

SOURCE: Cadillac Deville 2000- Engine check light code P0741

If you like go ahead and let someone sell and replace your transmission but here is my suggestion! Check around and see if you can find a minor vacuum leak! This can simply be the big round hose that goes from the fuel injection to the power brake hub! This is normally a push in connector which has about a 1/2 inch hose clamped on it! If there is any kink or the connector is not in correctly a leak will occur and the transmission will shift rough as though you will be thrown out of the vehicle! Try unplugging this connector and plug it back in hard and straight and maybe you will be lucky and fix your problem. If the vacuum is correct your transmission will shift better than you have ever experienced!

Posted on Aug 16, 2009

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1 Answer

NORTHSTAR ENGINE OVERHEATS


could be a couple of things1 you have a leak 2 the radiator is blocked run some radiator flush for about 1/2 hr drain then refill with water 3. is the fan working 4 you could have blown the head gasket open the radiator cap see if the water bubbles out 5 the thermastat could be shot.

Feb 27, 2013 | 1998 Cadillac DeVille

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2001 cadillac deville check coolant level but level is good.


Your coolant level switch at coolant tank may be bad,click here to see.

Nov 29, 2012 | 2001 Cadillac DeVille

1 Answer

'98 cadillac northstar deville engine temp up to 240 after useing bars head gasket repair---how can this be fixed ??????


Hello: You may have a stopped up radiator. A temp sensing heat sensor will tell you. Auto Zone or advance auto. Are you sure the head gasket is not leaking? Does coolant fill up the surge tank and bubble with engine running????

Jul 30, 2011 | 1998 Cadillac DeVille

1 Answer

My Cadillac Deville, 2002 northstar is running hot........or the temp gage goes up and I have to stop driving..I have a new thermostat,relay switches for the fans,temp control sensor and a new coolant...


Check the fan to see if it is going on. On my 1997 Cadillac Deville Limousine I had to have the 2 fans, and 3 relays replaced, as well as the wiring contacts for the relays at an auto electric shop for about $700 last fall, but it has been running cool since then.

Dec 31, 2010 | 2002 Cadillac Deville

1 Answer

Just came off a 1000 mile road trip. The engine died at the stoplight after I arrived home. (2002 cad deville northstar engine). the plugs were changed about 6 weeks ago and seemed to resolve the...


sounds like an ignition module or coil pack issue.happened to my friends 98 caddy sls.after a road trip to dallas,tx,then back to atlanta.

Nov 15, 2010 | 2002 Cadillac Deville

2 Answers

I just purchased a 1999 Cadillac Deville. Drove fine for a few days. Today I drove 75 MPH for 20 miles on freeway and car began to overheat. Dashboard told me to replace oil. Checked the coolant, it took 1...


When a Cadillac (Northstar) overheats, It will give the message to change the oil. If you run a Northstar and keep running it long enough it will start shutting off cylinders and stop the A/C compressor to help protect itself. In this condition I would check for a blown headgasket. Possibly your technican will find the problem. Could also be stuck thermostat, dirty radiator Thanks

Aug 31, 2010 | 1999 Cadillac DeVille

2 Answers

I have a Cdillac Deville 98 northstar. Getting an Error message - Engine overjeat, Change Engine oil, Check Coolant level and later I get Idle engine message I changed engine oil and coolant recently -1500...


Whatever you do, NEVER allow this engine to overheat and always use the correct antifreeze (DEX COOL) or you will damage your heads severly. The heads were made from aluminum so there is a very serious warping issue on the 1998 Cadillac Northstar engines. There should have been a recall but wasnt, ended up costing me 3 thousand USD to fix the engine problems I had but she now runs fine. I only had the car 4 months before this happened so someone prior to me owning evidentaly let it overheat on too many occassions and I had no choice but to fix cause I was still paying on the car!! Good luck

Jul 12, 2010 | 1998 Cadillac DeVille

3 Answers

I have a 99 deville w/ 32valve north star engine and i have problems with it over heating i changed the water pump the radiator and thermostat i have no leaks but it still wont stopover heating


It is probably a head gasket issue if you have replaced the thermo and the pump and it still overheats. You probably can drive it 15 minutes or so and then the gauge starts soaring towards overheat shortly there after. Under completely normal driving conditions. Northstar engine's actually don't overheat not from bad head gaskets (they aren't the defect issue) but the inferior bolts holding the heads to the block. The bolts have been found to be pulling out of the Northstar's soft aluminum block(this is the actual problem but it's blamed on the gaskets). Causing spaces between the block, gaskets and the head that allows hot exhaust air to seep into the coolant flow chambers. This why your have coolant bubbling out of the top of the overflow valve under the hood after only short drives. Under normal operation the engine is literally boiling it's own water supply. The head bolt issue is a design flaw by GM and one that leads to a great number of Northstar engines being crippled at well under 100K miles of driving. Only remedy is to have both heads pulled off the engine, the head bolt replaced with new gasket and you're all set. Bad new very labor intensive whcih = a several thousand dollar repair. I had it happen to my 1998 Concourse Deville. I feel your pain.

Feb 18, 2010 | 1999 Cadillac DeVille

2 Answers

HOW DO YOU CAHNGE THE THERMOSTAT ON 2002 CADILLAC DEVILLE


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.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 to near the thermostat housing,the blockage may be there.

Jan 28, 2010 | 2002 Cadillac Deville

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