Question about 1995 Cadillac DeVille

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Antifreeze/water gets hot and bubbles up into the radiator reservior.

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  • nanabanks Sep 14, 2010

    The fan is running. We have replaced the radiator and thermostat.

  • nanabanks Sep 14, 2010

    We replaced the radiator cap first. We then replaced the radiator. When we take the cap off and just let the car run we see the antifreeze rise to top. Sometimes it will go down and we will add more then we start the process over again. Its not circulaion with a free flow.

  • nanabanks Sep 14, 2010

    The engine is a 4.9

  • nanabanks Sep 14, 2010

    I could be the water pump We replaced it a while back and it was an after market product and cheap. We will try that. Thankyou very much. It will be a few days or so before we can get to it but I will let you know if that fixed the problem one way or the other.

  • nanabanks Sep 14, 2010

    We will try this solution and see if it works. We have already replaced the other suggestions.. Thank You



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Is your fan up front on the radiator working? You should be able to hear it running. If the fan is running then it would have to be your thermostat. If you are going to replace the thermostat it is in a small cover at the end of the top radiator hose. Right on the front of the engine.

Posted on Sep 14, 2010

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  • Rodney Clark
    Rodney Clark Sep 14, 2010

    Did you replace the radiator cap when you put the new radiator in? Sometimes the radiator cap has a spring in that hold a certain pressure. I believe it is 16 psi on the northstar.And sometimes the spring gets weak and will only hold 8-10 psi. Which will blow water/antifreeze into the reservoir.

  • Rodney Clark
    Rodney Clark Sep 14, 2010

    The only thing left that it could be is the water pump. I always start with the easy cheap things that it could be to try to save my customers money. And the water pump is not cheap or cheap to replace. You have to have a special tool to get the water pump out. The Northstar water pump needs to be replaced with a genuine Cadillac part. The aftermarket water pumps are no good. Or at least I have not found a good brand.

  • Rodney Clark
    Rodney Clark Sep 14, 2010

    You are very welcome! I am glad to help!



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2006 Chevy trail blazer. Keeps getting hot. Anti-freeze is full, overflow container is half full. Every time I turn it off can hear fluid in radiator boiling and bubbling?

Pam are you sure it's boiling? If the Antifreeze is boiling I'd think you'd see steam coming out of your reservoir as the water expands into the reservoir, but you didn't say you see anything like that.
Of course engines get hot, that's why we have the cooling systems but it doesn't sound like it's "boiling" to me with no signs of visible steam unless your antifreeze level is really low?

If it's really boiling, and you antifreeze level is good, then your reservoir should be getting filled up with expanded hot water that goes into it to catch it when it expands.

If the water isn't going into the reservoir, then maybe your antifreeze level in the radiator is too low and you need to add antifreeze?
Best to fill the radiator with the engine cooled down. If you ever have to open the radiator when it's hot, NEVER open it with your bare hand as you could get scolded with boiling water. Instead use a big thick towel to remove the radiator cap off a hot engine. Again, if you can, just wait until the engine cools then open the radiator cap.

With the engine cool, you can fill the radiator with a 50/50 antifreeze mix. The 50/50 mix come premixed 50 percent water, and 50 percent antifreeze. So you can throw that stuff straight into the radiator.

Non mixed antifreeze needs to be mixed 50/50. Some people use 50 percent distilled water when they mix it because distilled water doesn't have the minerals in it that may get stuck in your radiator. That's being a bit picky about it though. Tap water works fine in a pinch. The other 50 percent is antifreeze. You can mix it right in the radiator too, put in a measured amount of the antifreeze, followed by the same measured amount of water. The water pump will mix it all together when you run the engine.

Put the cap back on and run the engine and if/when the water "boils" it should go into your reservoir. If it does boil in go in the reservoir then yes...your engine is getting hot and the antifreeze is boiling.

When the antifreeze boils, it's probably because your thermostat is stuck closed. That means the thermostat isn't letting water circulate through the radiator to get cooled. Thermostats are more than $30 I'd say for most cars. Changing them is pretty easy too as they are usually right at the top of the engine. A mechanic may charge $100 to change it....but it's an easy job on most vehicles requiring just a couple sockets/socket wrench.

Oct 03, 2016 | Cars & Trucks

1 Answer


Remove radiator cap.Remove radiator bung from bottom of radiator and drain into container.Replace bung.Replace new 50/50 water/antifreeze mix.Turn interior heater up to max with fan on lowest setting.Run vehicle until hot, topping up radiator as required.Replace radiator cap when bubbling ceases. Road test vehicle, return and recheck level after cooling down period.Recheck level over the next few days and check for any new signs of leakage in system.(Fresh introduction of antifreeze can reduce the tension of the water molecules and can produce new leaks)

Nov 13, 2012 | Cars & Trucks

1 Answer

Oil and Water mixing in the reservior

Bad radiator, blown head gasket.

Apr 06, 2012 | Cars & Trucks

2 Answers

My 2001 ford explor sportage in leaking antifreeze and smoking whats the problem the leak is coming from the front passanger of the truck

possiblie a spilt hose check all hoses also check radiator 4 damage also check radiator reserve bottle dont forget the heater hoses or by passhoses on the motor

Sep 08, 2011 | Ford Explorer Sport Cars & Trucks

4 Answers

My 2001 Ford Taurus keeps running too hot to safely drive. Whenever the car is started fluid immediately gushes out of the plastic resevior that you put the water/antifreeze leading to the radiator. I...

You have an air bubble at the top of the engine.
The antifreeze spewing out of the overflow happens due to your perfectly functional radiator cap
passing the overheated coolant/air mixture out of the system into the reservior (in an attempt
to relieve overpressurization of the cooling system)
The sudden nature of your overheating comes from the boiling of the inadequate amount of
coolant/antifreeze in your engine, since it cant properly cool the engine, so it boils (overheats quickly), and pressure rises immediately within the cooling system.
The Fix is free: locate and open the (air) bleeder port at the top of the engine, and add the usual
50% coolant/50% water mixture to the radiator until the radiator is full to the level indicated in
your owner's manual (or the "Full" line). Then close the bleeder port and replace the rad (radiator)
The air bleeder port is normally located near the thermostat, and should be opened each time
that coolant is added to the radiator. The air bleeder port need not be opened when adding
50/50 coolant to the reservior, since the rad cap is going to be closed while adding coolant
to this part of the cooling system.
Warning: driving beyond the point where your engine temperature gauge indicates overheating will
destroy the car's engine - it'll seize up due to overheating, and the only fix for a seized/burned-up
engine is replacement (of the engine). Seizing an engine is really easy with an air bubble in the
top of the engine - you could easily burn up/warp the head, necessitating replacement of the head
and head gask

Sep 04, 2011 | 2001 Ford Taurus

1 Answer

I have a 1989 f 250 truck.i brought it to a machanic and he just said that the tempature is running hot and i dont want to mess any thing up so how do i go by fixing this and what could possible be the...

Hello, That sort of sounds like he did not want to work on your truck because it might take big money to fix it.

Here is how to check a few things. When the engine is warm, not hot, take off the Radiator cap and use a flashlight and look at the water inside the Radiator. The motor should be running. You should see good flow with antifreeze circulating in the top portion of the radiator. The antifreeze should not have oil or air bubbles on the surface. Just flowing antifreeze.

If the water is flowing, no oil, no air bubbles, then the radiator is not clogged and the head gaskets are probably good. The water pump is probably good if no antifreeze is leaking from it. Try putting in a new water thermostat. Put the radiator cap back on and run the engine and look for collapsed hoses when the engine is running faster.

You can get your radiator cap checked for pressure or just buy a new one. There are some tools for checking Radiator pressure and Autozone,Advance, and Oreillys all have loaner programs. Once you have a new cap, if there is a leak, it will probably show up.

At this point, you have only bought a thermostat and a radiator cap. The rest of the needed repairs will depend on observation of the water flow I mentioned and if these 2 simple things solve your problem. I hope my solution is very helpful to you.

Jun 30, 2011 | Ford F-250 Cars & Trucks

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.


Jan 26, 2011 | 1989 Mercury Colony Park

1 Answer

Replaced water pump and termastate, car still over there some kind of in-line valve for the coolant

When you put thermostat in did you put spring side towards the engine? Did you get the air pockets out? Do both upper and lower radiator hoses get hot? If both radiator hoses get hot then you got out the air pockets. Does the cooling fan kick on? Is the air deflector still on the car. The next step is to check for blown head gasket. Get the engine hot make sure both radiator hoses are hot and antifreeze is filled to the top hold rpms around 20 to 25 grand and watch for air bubbles. If there is air bubbles and the antifreeze doesn't go down that a good chance of head gasket. I the antifreeze goes down that just air pockets coming out. If you not sure or want to double check after making sure your system is fuel of antifreeze and let engine get cold. Then start car and run 20 to 25 hundred rpms and watch for air bubbles. This sometimes is easier because you're not dealing with that hot antifreeze. They also make what they call a block tester if you want to spend more money. They work but I'm not that thrilled about them. The best way is with an exhaust analyzer also known as emission machine to test for HC in the cooling system. Just be very careful if antifreeze goes up the probe it will damage the machine. If you run through all this checks you should find what is causing the problem. Opps I forgot the temp gauge and or temp light may not be right but if your also steaming it's not them.

Nov 01, 2010 | 1998 Pontiac Sunfire

3 Answers

I just flushed my radiator and bought two gallons of antifreeze. I have a 1998 GMC Sierra 2500 4X4 454 7.4 L. How and how much antifreeze/water do i put it. I have no owners manuel.

the final ratio is half water and half antifreeze, since the engine will have water left after the flush add antifreeze first thenwater and check it with a hydrometer or tester

Oct 22, 2010 | 1998 GMC Sierra

1 Answer

Coolant light and engine light is on what do i do

Check your radiator's water level with the engine not running, also check the reservior level. If they are low top off the radiator until it is full with antifreeze and the reservior to the full line on the outside of the reservior. For the check engine light make use of Autozone's free engine light check, they can tell you what the codes are and the best solutions to fix the issue(s).

Aug 30, 2010 | 1997 Chevrolet Lumina

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