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Engine heats up and coolant boils and spews from the reserve coolant container. ....but heat indicator does not show high temperature.

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  • Cars & Trucks Master
  • 14,578 Answers

You probably need new radiator cap ! These cooling systems are a closed type , under pressure so the temperature can run hotter , for better fuel efficiency an performance ! You can have it pressure tested at a parts store I'm sure .

Posted on Apr 19, 2015


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  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: engine is over heating and blowing air into coolant resivor and boiling coolant

1. Do you have a cooling fan system for your car, if you have , please check it, sometimes due to the wire overheated short problem and fan doesn’t work and cause the engine over heat.

2. If the head gasket leaking, you can check you oil steak see if there is white steam oil bubbling ,if the oil has steam and the radiator has oil mixed with coolant , that means the head gasket leaking.

Posted on Jun 24, 2008

  • 2007 Answers

SOURCE: overheating,reserve coolant tank boiling

Water pump gone.

Posted on May 04, 2009

  • 192 Answers

SOURCE: Engine coolant indicator

It sounds like you're either low on coolant or have a stuck thermostat. If you're low on coolant you may have a leak. For coolant I recommend using 50/50 mixture of antifreeze and water. You can buy pre-mixed 50/50 antifreeze or buy the 100% and dilute it with 50% water. The thermostat is a temperature controlled valve. It's held close by a spring until the desired engine temperature is reached. It then opens and allows coolant to flow in a loop from the radiator to the engine. If you're low on coolant or the thermostat gets stuck the engine will overheat which will cause the temperature gauge to rise. As the temperature increases so does the pressure. When the pressure and temperature get too great, very hot coolant, approaching steam temperatures, will find some way to escape and show up as smoke from your engine. Do not try to add coolant when the engine is extremely hot. Wait for it to cool. Be very careful removing the radiator cap when the engine is hot. Hot gas and liquid can come spurting out and burn you badly. You can add coolant to the overflow reservoir safely since you don't have to remove the radiator cap to do this. When your engine is hot try to find where the coolant is leaking from. It may be something easy to fix like replacing a radiator or heater hose.

Posted on May 20, 2009

  • 89 Answers

SOURCE: 1997 2.4L Chevy Cavalier LS; Low Coolant Indicator and Temp Gauge

take the cap off of the radiator (whil engine is cold) start and run the vehicle. keep runnig 30mins after the vehicle is hot keeping notice of the rad fluid level.
keeping the cap off will prevent the pressure build up that woiuld keep the air in the system, keep adding water or antifreeze as the level goes down. this may take an hour or so.
also with the cap off, you will be able to see if your water pump is operating correctly. you will visibly be able to see movement in the rad when the pum is engaged.

Posted on May 26, 2009

  • 106 Answers

SOURCE: 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...

Posted on Jul 14, 2012

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4 Answers

What is causing antifreeze to come out overflow tank?

Could be a defective radiator cap, or a leaking head gasket.

Oct 28, 2014 | 1999 GMC Suburban

1 Answer

I have a hino 1995 ff2h h07c-turbo experiencing overheating problem. When I'm driving suburban street below 65kms the engine temperature is moderate. However once I drive on motorway exceeding 70kms...

You say its overheating but not loosing coolant, is it truly overheating or is the gauge telling fibs. You seem to have done all the right things but if it retains its coolant I don't see a reason other than the gauge. When you next run it and it shows overheat on the gauge, get a rag and very gently crack the rad cap. If hot water comes out but no steam then it may not be too hot. If after a few minutes you are able to safely remove the cap see what the gauge says with the key on but not running. If the gauge says its still high then the gauge is faulty because its obviously not boiling the coolant.
Lastly, have the rad cap checked or replaced because the cap is crucial to the boiling point of the coolant. Make sure the cap pressure setting is right for your vehicle, too low and it will boil easier.

Nov 06, 2013 | Cars & Trucks

1 Answer

My 2005 Venture is having an overheating problem. First we had the thermostat replaced, then the fluids flushed, the o-ring replaced and then all of the fluids replaced again. It's still doing it. It's...

is your coolant reserve bubbling or boiling
i ask because you already changed the thermostat
and if you saw bubbles it maybe a blown head gasket
it will cause overheating
hope this helped
give feedback

Jan 24, 2011 | 2005 Chevrolet Venture

1 Answer

Bubbles and heats up in the coolant container on side of engine,water disappearing out of radiator but don't know where its going?as well as using heaps of coolant,petrol and temperature gauges are always...

bubbles on coolant extension is the pressure produces by the high temperature when the engine heats up. pressure always finds the nearest escape. need to change engine thermostat.

Jan 19, 2011 | 1989 Mitsubishi Galant

1 Answer

I change the water pump, thermostat, and radiator but its still over heating

I assume that there are no leaks anywhere and the radiator cap is in good condition. A bad radiator cap wil be indicated by the coolant being heard to boil just after the engine is stopped because of the retained heat in the engine when there is no coolant circulation. Ensure all the hoses and clamps where they connect to the various pipes in the engine bay and fix/replace any that are suspect. The heater hoses and those pesky little bypass hoses in the cooling system tend to go hard and split if they are over 10 years old, allowing coolant loss. Those spring type hose clamps tend to be less effective in clamping as the hoses become hard. Worm drive ones are the best to use.

If there are no leaks and water pump and thermostat are working correctly, but undetected loss of coolant once the engine heats up, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry and warping the head) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap. If the head gasket leak is bad enough it will allow coolant into the combustion chambers which will produce white steamy smoke in the exhaust and allow coolant to get into the sump while the engine is stopped. This is indicated by a white oil and water emulsion on the dipstick.

Oct 27, 2010 | 1999 Chevrolet Malibu

2 Answers

I have such problem on audi s4 b5 2.7bt . when i switching off ignition and turn it on after several minutes, the water temperature is about 110 degree, and after this when i drive everything goes ok....

What you describe is quite normal. While the engine is running and the coolant is circulating the thermostat maintains the engine within its operating temperature range. When the engine is switched off there is still considerable heat within the engine and the coolant will continue to absorb this heat. With no coolant circulation, the coolant inside the engine will register a temperature rise to the extent your gauge measures. This temperature rise may persist for up to 15 minutes until the natural thermo-syphon of the cooling system starts to dissipate this heat build up and the engine starts to cool down. Because the cooling system is pressurised, the coolant is prevented from boiling off at this temperature above boiling point. Once the engine is restarted the coolant flow is re-established taking this excess heat from the engine and the system temperature returns to normal.

Sep 20, 2010 | 2000 Audi A6

3 Answers

What is the coolent reserve tank for???? IF broke does it need to be fixed immedatley? Mine is busted and I was wondering if my car is going to overheat now. THANKS

The coolant reserve tank is a medium for the radiator to breathe. Water passes from the radiator to the coolant reserve tank and fort.

The car might not necessarily over-heat if the coolant reserve tank is broken, but it is advisable that you replace it to enable it serve its purpose within the operations of the car engine.

Good luck.

May 27, 2010 | 2004 Toyota Avalon

2 Answers

Heating System

The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Oct 01, 2008 | 1993 GMC Sierra

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