Question about 1999 Cadillac DeVille

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Air bubbles in the coolant system causing the car to run hot

New thermostat, new water pump, 7 month old radiator, and the car still runs hot. i noticed my heater doesnt kick in until i;m driving as i just bought a new heater core 3 weeks ago.

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  • Cadillac Master
  • 2,002 Answers

If you are seeing air bubbles, then the cooling system still has air pockets in it. Loosen the overflow cap and leave it that way for a few days while you drive.Keep the heater turned on at the max heat level. Roll a window down if necessary. Check and top up the overflow bucket daily and top up as necessary. The bubbles should disappear after a few days, then you can tighten the cap. This should also solve your no heat problem. Once the bubbles are gone you can tighten the cap.

If the problem doesn't fix itself in a week, you should have the car looked at for a possible bad head gasket, which would force air into the cooling system. Hope this helps.

Posted on Feb 20, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 10 Answers

SOURCE: 95' Cadillac DeVille has no heat

You have air in the system. You have to park the car on an incline so the front of the car is higher than the rear, then run the engine with the radiator cap off and let the air escape while topping off the radiatorevery now and then. I was told about the incline to get the radiator higher than the heater core so that the air bubbles could come out.

Posted on Jan 16, 2009

co7196
  • 3433 Answers

SOURCE: 94 cadillac loosing water

look into the coolant recovery bottle with engine running and make sure hose i end is submerged. If you see bubbles, you have a head gasket leaking. How does the car run on start up?? a little rough at first?

Posted on Jun 09, 2009

ourhowse
  • 2007 Answers

SOURCE: does any coolant flow through the intake manifold?

Yes coolant flows through the intake. Are you sure you didn't put the thermostat in upside down? That's about the only thing that can cause a rad or heater core to blow. It should be installed so the spring part goes into the block.

Posted on Nov 18, 2009

saailer
  • 1868 Answers

SOURCE: i changed the water pump

Hello! It is extremely important that you only use Dex-Cool in your Cadillac's cooling system...It is Orange in color...If you have used another coolant or the block has not been flushed in some time, flushing is needed...

Drain the cooling system...Do not remove the thermostat...Fill radiator with drinkable water...Turn heat on full...Run engine until thermostat opens...Shut down, let cool then drain...Do this several times until water comes out clean...Replace thermostat...Replace O-rings on thermostat pipe...Coat thermostat bolts with Permatex...Re-fill with Dex-Cool...

Here is Vacuum Diagram...

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Guru.Saailer

Posted on Jan 26, 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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1 Answer

Why is my radiator getting hot? the pump is working, the water is circulating , thermostat seems to be working also!


Some possible causes of the high coolant temp...........

1. The radiator fans are not kicking in when the temp rises.

2. The water pump may be working but if the impeller blades have corroded badly the performance of the water pump will be very poor. (Some water pumps used by some manufacturers have plastic impeller blades and over time these blades will break apart).

3. The thermostat is stuck partly open and is retarding 100% coolant flow through the radiator.

4. You have a partial blockage in the cooling system which is retarding coolant flow. This may be in the radiator or in the cooling passages in the engine.

5. Check if you have bubbles in the radiator. Wait for the engine to cool and start the engine. Take off the cap and wait for the thermostat to open and for the hot water to begin flowing through the top hose into the radiator. Then watch for any bubbles appearing in the coolant. If there are bubbles continuously it is an indication of a combustion leak into the cooling system and that will cause overheating until the problem is fixed. In that event have a leak down test carried out on each cylinder to confirm that the combustion is leaking into the cooling system..

Have the problem, whatever the cause, investigated and fixed. Allowing the engine to run hot will cause expensive engine damage many times what it will cost you to fix the cooling issue you have now.

By the way, blowing out a coolant hose is not a fault. It is due to owner negligence in not replacing the top and bottom radiator hoses every 6-7 years because over time the hoses deteriorate like many items in a vehicle that require routine maintenance and replacement due to wear, use and time.

Dec 25, 2015 | 2002 Nissan Altima 3.5 SE

2 Answers

Can a year-old water pump that doesn't leak or make noise just stop pumping ?


The impeller could break loose from the shaft. You would have to remove the pump to find out for sure.
Could be a blockage in one of the passages too.

Apr 13, 2015 | Cars & Trucks

3 Answers

Car running hot


the water coming out of the front would be from the water pump, it also would be an indication that the pump is bad, which may have been the reason of why the car overheated in the first place.

Dec 19, 2014 | Cars & Trucks

2 Answers

Over heating and blowing cold air from heater


Possibly leaking head gasket. Easiest way to check would be to fill radiator full, start engine and watch coolant level in the radiator cap opening. The top radiator hose will become hot when thermostat begins to allow coolant flow through the radiator. You may have to top off the coolant. Still with the radiator cap off watch for water belching out of the radiator neck. If coolant does belch out of the radiator cap neck, refill with water. If it belches out coolant again it would be combustion gassed forcing the coolant out of the radiator.


This process should take about 1/2 hour to diagnose if it is a head gasket leaking combustion gasses into the coolant.


The radiator fan may run once car is shut off to cool engine compartment to prevent gasoline in fuel lines from vaporizing which would cause a condition called "vapor lock". A car won't start if fuel lines are vapor locked.

Good luck, I hope this helps you to figure out the problem.

Apr 17, 2014 | 2005 Buick Rendezvous

1 Answer

If its running hot and says check coolant level and the water bubbles out of the radiator cap does that mean water pump or cylinder


engine have back pressure that cause overheating or engine runs hot. could be, ( yes, cylinder) the piston rings. but the cooling system is the other system you have to look into. check the engine thermostat, if found faulty, replace it.

Sep 22, 2012 | 1999 Cadillac Seville

2 Answers

My heater blows cold air when car is stopped. i have installed a new water pump and the radiator is full of water.


you still have air trapped in the cooling system. Get front of car as high up as you can on a hill. Cold engine - loosen radiator cap, fill with 50/50 antifreeze mix. Start engine and run until upper radiator hose is hot (thermostat open). Engine should burp air and maybe spill some coolant, that's ok. Once burped, tighten cap, shut off engine and let it cool down while keeping the reservoir full. It will **** coolant out of reservoir as it cools. Keep it full.

If still cold air, take to a shop that has evac/fill equipment; they will **** air out and repalce with coolant. About $80.

gerry

Jan 26, 2011 | 1989 Mercury Colony Park

2 Answers

94 Volvo 850 turbo still running hot


Do the air purge test below.

The fins/turbine on water pump can be totally worn out.

====

When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!


Sep 15, 2009 | 1986 Volvo 740

2 Answers

Running hot


If you are loosing antifreeze with no apparent leak you may have a serious internal engine problem and should seek professional help. Stop driving the truck until you can have it looked at. If you are not loosing any coolant, then Service the cooling system. Drain and slush the radiator, replace the thermostat, clean the radiator fins, pour in a 50/50 mix of antifreeze and distilled water, and bleed all air from the system. Inspect the water pump to see if it is pumping correctly.

Sep 02, 2009 | 2004 Dodge Ram 1500

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