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Last night I was driving home and the temperature gage was going high. The coolant was full but bubbled for a while. Bubbling slowed, & I nursed it home w/gage going above half and back down & so on.

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  • Cars & Trucks Master
  • 2,443 Answers

Stuck thermostat or blocked up radiator or heater core.

Posted on Aug 11, 2017

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  • Cars & Trucks Master
  • 16,993 Answers

Could be low coolant.

Posted on Aug 09, 2017

Testimonial: "I pulled over to check and it was full. Started the engine just to top up a little and it started bubbling. The bubbles slowed down after a while and when I was heading back was when the temperature was going up and down. But this time wasn't going dangerously high, so was only going over half then back under again, but I didn't want to push it......"

  • Brad Brown Aug 11, 2017

    Bubbles coming out of the radiator with the engine running are a sign that the head gasket on the engine is failing and allowing exhaust gasses into the coolant. There is a test that you can run to verify but you are looking at thousands in repairs

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6ya6ya
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Posted on Jan 02, 2017

hi99ins
  • 123 Answers

SOURCE: engine temperature reading high

Faulty temperature sensor I think, thats what feeds the gauge. If the vehicle is genuinely running hot there would be a lot of pressure in your radiator causing overflows/steam/coolant smell.
Those sensos wear out and commonly go to short which shows a higher & higher reading until they fully short out
...hope that helps.

Posted on Jan 09, 2009

Sergey2121
  • 46 Answers

SOURCE: COST OF REPLACING A THERMOSTAT ON A 2004 IMPALA

Thermostat itself is like 8 dollars, from Kragen, or Autozone.

Posted on Apr 08, 2009

  • 1779 Answers

SOURCE: 2003 Honda Civic runs hot when idling.

Check the cooling fan switch. It appears your auxiliary electric cooling fan isn't going on when at idle. and engine temp increases. While you are driving, air is being rammed thru your radiator as you cruise along, so it isn't overheating, at idle, that isn't happening, and the fan should go on as the temp goes up. When the ac is switched on, the fan is being signaled to operate due to the heavy ac load on the cooling system.

Posted on Apr 27, 2009

localwonder
  • 6784 Answers

SOURCE: Oil pressure gage stuck on high

HI, you will need to replace the oil pressure sending unit(pressure switch), it has failed.

Posted on Jun 21, 2009

chris bean
  • 61 Answers

SOURCE: my temperature gauge keeps going up and down when

pull off the hose at the top of the motor, if you can see the thermostat try pushing on the center with a screwdriver, it is most likely stuck open. You may be able to free it by pushing the center back and forth till there is no longer any resitance, but it needs to be replaced. As for the temp sensor, if it is bad the guage will flicker, representing a bad connection. If the gauge just rises and falls by pattern the sensor and wiring is probably fine.

Posted on Mar 28, 2010

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1 Answer

Why is coolant bubbling in the reserve tank?


Return your vehicle to the place of service and give the mechanic an opportunity to complete the job. It may be discovered that something else may have to be done to accomplish this.

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My radiator has coolant bubbling out of the upper corner sort of where it connects to the upper hose. Is there a gasket or oring there? Does bubbling mean there's air in the system?


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bubbling when the coolant is full indicates a head gasket problem. have a compression test done to check for gasket/cracked head. have a flow test done on the radiator as the cores may be blocked reducing coolant flow.

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What can cause it to over heat? the temperature gage only goes three quarters of the way?


A true overheat is when the coolant is bubbling back into the coolant recovery tank. #1 radiator cap not holding pressure #2 stuck thermostat #3 restricted air flow #4 bad fan clutch #5 bad waterpump #6 restricted water flow in radiator #7 blown head gaskets this is the end results to a overheated engine .

Jun 10, 2014 | 2000 Ford Expedition

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Bubbling noise after driving for 5 mins or so


Sounds to me like you've got to open your heater control to full hot and allow the coolant to circulate. You may have some trapped air in the system. In the past, I've even "bounced" the car a little to help speed the process. Check coolant level before and after.
Let me know how this works out.

Nov 30, 2012 | Cars & Trucks

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I'll try to be brief. 2 months ago heard boiling


That car is over heating! Things to check #1Fan does it run #2thermostat change it #3 water pump pull the top rad hose to see if the pump is pushing water #4 last but worst flush the rad check to see that ther is good flow through it may be nessasary to change it. I'm sure one of these will sove your problem.

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Engine coolant hot sensor and idle engine sensor appear 5 minutes after driving. When I park car and shut it off I hear bubbling noises


Hello: The first thing is check the coolant level. Do this on a cold engine, if engine is a 4.9 check both the radiator and the overflow tank. Make sure they are full of coolant. If it is a Northstar engine then make sure the surge tank is full, this may require checking the tank again after bring the engine to operating temperature then let it cool off. DO NOT OPEN COOLING SYSTEM ON HOT ENGINE it could cause serious burns to you.

Feb 11, 2011 | 1995 Cadillac DeVille

1 Answer

Engine temp gage spikes to 260 degree when


are you sure the cooling fans are working?
Is the coolant temp gauge telling the truth?
have you lifted the hood and heard the coolant bubbling into the overflow?
Or heard the tinging sound of a red hot engine?
If he did a liquid test with the dye,and it changed colors it should have changed very fast,
Another thing to think about if he was to take the fan belt off,and pull the thermostat housing off,and removed the thermostat,Now pour coolant into the thermostat hole to almost the top,Now start the car and see which side the bubbles come from,left or right,that will be the gasket that is leaking not both.

Jan 23, 2010 | 1997 Chevrolet Monte Carlo

1 Answer

Dear sir when ever i drive long distances and shuts down the engine i can hear the radiator bubbling.


Thats not necessarily a problem. I'm assuming your not overheating while driving. The bubbling sound you hear is most likely thr sound of coolant bubbling into or outoff the overflow tank. If you losing coolant, however, you may have a leak. Next time you park and turen the engine off cxheck underthe car and see if any coolant is leaking.

Dec 21, 2009 | 2000 Honda Civic

2 Answers

My 1998 sunfires temperature keeps getting hot where as i can hear it bubbling when i shut it off! the water pump was replaced but it is still doing it!!!


It sounds like you have air on your cooling system, recheck the coolant level at the radiator cap. "engine cold" Make sure the radiator is filled to the top and add if needed, place the radiator cap back on only at the first click and make sure the over flow tank is at the full level and start up the engine to warm it up with the heater on high heat. If you like you can go for a 10 min drive to ensure the thermostat has opened and all the coolant has cycled through out the engine and heater core. With the engine still running, close off the radiator cap to the second click and then turn off the engine, this should have worked the air out of the system. If not do it again and keep en eye on the over flow tank, top off if needed. Good luck and hope this helps. 

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