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Alex Russell Posted on Dec 03, 2013
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Radiator overflow I got home after work to see a puddle coming out from under the car. opened the hood and saw my overflow full and boiling and shooting out the open hose for the overflow....

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Ricardo Loranca

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  • Nissan Master 552 Answers
  • Posted on Dec 03, 2013
Ricardo Loranca
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Joined: Dec 05, 2008
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Ccheck your thermostat

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  • Posted on May 30, 2010

SOURCE: nissan path 95, boiling near to over heating

It certainly can cause the condition, but so can TONS of other items: coolant level, bubbles in the coolant (air bleeds), reaiator restrictions.

You could test the thermostat, pull it and put into measured temprature water and observe it as you raise the temprature...

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0helpful
1answer

After driving I noticed smoke coming from the right of my hood. I popped the hood and I realized under there was a puddle of liquid. It was an orange-ish colored and it was near my radiator. And my check...

I think you have radiator leak ... orange-ish as you say is the color of cooling liquid
check at cold the antifreeze level in radiator and overflow can
0helpful
1answer

Leaking coolant after radiator replacement

If you are talking about the reservoir that hose is the overflow hose.
Its possible the shop did not release all of the air pockets from the system and some coolant came out with the air bubbles.
The tank should be about half full hot and cold.
2helpful
1answer

The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank

Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor
0helpful
2answers

My s 430 has smoke coming from under hood after driving but not all the time temp gauage reads normal. I had oil and trans leaks sealed but it is still happening, what else could it be? Thanks

SMOKE UNDER HOOD COULD BE COOLANT LEAK FROM RADIATOR ITSELF OR CHECK FOR LEAKING TOP RADIATOR HOSE AND CHECK FOR LEAKING BOTTOM RADIATOR HOSE.LOOK UNDER THE HOOD IF COOLANT BOILING OUT COOLANT OVERFLOW JUG ENGINE OVERHEATING FROM BAD THERMOSTAT OR BAD WATER PUMP.CHECK FOR COOLANT LEAK AT WATER PUMP WEEP HOLE.IF SO WATER PUMP NEED REPLACING.ADD MORE COOLANT UNTIL LEVEL CORRECT.TRY LOCATE LEAK. IF CAR OVERHEATED AND BOILED IT OUT. SMOKE UNDER THE HOOD CAN ALSO BE CAUSED BY LEAKING VALVE COVERS WHICH CAN BE FIRE HAZARD IF OIL LEAKS ON HOT EXHAUST MANIFOLD.
0helpful
1answer

I hear a rattling noise under the hood and it sounds like something is loose and then I also heard like a boiling sound comeing frm under the hood i checked my gauges and they were fine

Hi,
from your description it could possibly be the radiator / coolant overflow operating. Although, it's unusual for the noise to be loud. With your engine stone cold, check your radiator forcoolant level and also check the coolant overflow bottle for having the correct level of coolant. Also check the hose which connects the two units.

As`a precaution, check to ensure that the radiator cap is fitted correctly and securely., again with the engine stopped and stonecold.

Hope this helps.
0helpful
1answer

Hi, Coolent puddle was formed under the bonnet after driving for straight 70kms. Overflow bottle was full and noises of boiling could be heard.Dont know what the problem is. Thanks

FIRST CHECK FOR LEAKS ON BLOCK THEN HOSES OR RADIATOR. THEN IF NOTHING FOUND RUN VEHICLE TO OPERATING TENP WATCH FOR EXCESS WATER OR MOISTER OUT TAIL PIPE.IF NOTHING FOUND CHECK THERMOSTAT,CHECK FOR FLOW IN RADIATOR
0helpful
3answers

Hi my name is Heath. I have a 1990 Ford Bronco. The other day after i drove it home, I pulled in the driveway and turned the engine off. I got out and heard a hiss so i opened up the hood and I saw brown...

A flush and a thermostat is never a bad idea, but it sound like your radiator cap is worn out, not holding pressure, replace it, should have a 16 lbs rating radiator cap.
5helpful
2answers

Water was boiling and spraying from overflow / reservoir tank from what appears to be a factory made hole. was there a plug in there that might have rotted off and caused this?

well that mean that oone your thermostat is not opening or your water pump or possible that a hose might be collapsing to cause the water not to flow
1helpful
2answers

Its runnining close to hot on temp gauge and after i parked it from driving home fom work i saw some smoke coming from under the hood

If smoke, you may have a leak in a hose. When cool, check for water marks usually coming from the connection to the radiator. Another thing to do but may be dangerous is to load up the radiator with water and start the engine, let it run for about 15min for it to heat up and look for water spray. Also, when parked, is there a puddle of water under the car?

Also, I would check the water level in the radiator (never open when hot), to see if i need to add water. Don't look at the reservoir as a reference. It could be just low.

The key here is you think there may be smoke coming from the hood.

Another thing, if the radiator is full of water, then it could be your thermostat. it is usually located at the end of the top hose which runs from the radiator to the engine. In this picture, you are looking at the top of the engine looking down. This is the location of the Thermostat. If your vehicle is close to over heating, this valve could be getting stuck.
46587e0.jpg
As a test, remove the thermostat and try driving it around to see if it gets close to overheating.

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