Question about 2001 Nissan Sentra

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Boils coolant out under cap - 2001 Nissan Sentra

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Thank you for choosing FixYa and welcome to the site John. If it is coming from the cap, as you stated, you need to purchase a new coolant cap. They just cost a few dollars. Make sure your hoses in that area, if any, are on tight as well. Thank you very much for using FixYa and have a good night.

Posted on Mar 28, 2011


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I drive a Camry V6 3.0L Every time I top up the coolant to the recommended level and after driving the contents in the reservoir boil over and spill out.

There may be a slight head gasket leak to the coolant jacket, not large enough to overheat the engine. It is normal for some coolant to escape at operating temp, but not lots, and it should cool down to about the recommended level again.

Something is pressurising the coolant jacket. Have it tested for the presence of combustion gasses in the coolant. This is a simple test.

Another thing, that model often develops a crack in the radiator plastic top tank. It is not the problem here, but worth knowing.

Oct 29, 2016 | Cars & Trucks

2 Answers

My 2002 saturn boils over but does not overheat sometimes i will drive across town and all is fine sometimes i will drive 7 miles and reservoir will boil guessing thermistat water pump or cap

Of the water is boiling them it has run hot. There is no way around this fact. Get a compression test done first. This should reveal if any damage has been done. Then address the boiling off problem. This can be a air pocket in the line, incorrect anti freeze mixture, sticking thermostat, water pump, cap, etc.

Oct 20, 2016 | Saturn Cars & Trucks

1 Answer

It sounds like it's boiling when I turn my car off. Is my thermostat?

It may just be a defective radiator cap, if the cap doesn't hold the required pressure the coolant will boil. Make sure the coolant is clean and in good condition and is a 50/50 mix and try replacing the radiator cap.

May 18, 2016 | Cars & Trucks

1 Answer

I flash my radiator and change thermostat and still overheating and temperature light what should I do......

Check for proper water pump operation and belt routing also check to see if you cooling fan is working also pressure test the system and radiator cap ( water boils at a higher temp when under pressure so the system and cap must Hold at least 14 psi) if the coolant is not under pressure it can boil in the block and heads and the bubbles will prevent proper cooling

Jun 12, 2015 | Cars & Trucks

1 Answer

What happens if pressurized coolant system recovery cap is missing while driving at operating temperature?

the pressurized radiator cap is there for the purpose of increasing the pressure on the coolant and thereby increasing the temperature at which the water will boil. By driving without the correct cap or with no cap then the water will boil at 100 degrees C which will be much sooner than normal so you will run the risk of overheating the engine under normal driving conditions. Because the hot water is allowed to turn to steam and evaporate quickly you will also run short of coolant more quickly. Just drop into a auto spares shop and pick up a cap for the car as the price for it will be pocket money compared to what it will cost if you don't.

Aug 20, 2014 | Cars & Trucks

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What is the high temperature range for the coolant

Your question isn't a simple black or white question, it's all relative to how many PSI is your radiator cap and what mixture of anti-freeze your running, and also, how old or new the anti-freeze (coolant) is.

The pressure cap on a cooling system is the key to raising the boiling point of the 50/50 mix of antifreeze and distilled water. For every pound of pressure cap rating the boiling of point of the above mixture raises 3 degrees. If you had plain water in your cooling system with a 15 pound pressure cap the water would boil @ 257 degrees. If you had a 50/50 mix of antifreeze and water the coolant would boil @ 265 degrees with a 15 pound cap. The boiling point would raise to 270 degrees if you had a 60% antifreeze mixture with a 15 pound cap. If you had a 70% mixture the boiling point would raise to 276 degrees.

Mar 11, 2014 | 1989 Cadillac Eldorado

1 Answer

Losing coolant

Need to have the system pressure tested, Check oil to see if there is a brown sludge in the oil filler possible head gasket? and its boiling it in a cylinder, check carpet under dash on transmission tunnel if wet (heater leaking) Is the coolant cap seal OK (not pressurising and boiling the coolant away). That give you some ideas to go with.

Jan 02, 2014 | 2001 Chevrolet Monte Carlo

2 Answers

Overheating coolant boiling out into reserve tank

you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

Jul 14, 2012 | 1998 Plymouth Breeze

3 Answers

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.

Aug 23, 2010 | Ford Bronco Cars & Trucks

1 Answer

1995 Volvo 850 Overheating

head gasket is blown

Apr 26, 2010 | 1995 Volvo 850

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