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Air bubbles in radiator

Im getting very small bubbles in my radiator when engine is running?

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When the motor is off open the lid and slowly squeeze the top radiator hose and it will bubble the antifreeze at the radiator some may spill out but after u squeeze it simultaneously it shouldnt bubble anymore and then just refill what spilt out

Posted on Feb 20, 2012

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6ya6ya
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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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wilsodfarm
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SOURCE: 2001 4.3L chevy s10 running hot

You still might have air.do you see curculition through the radiator?,but here is what I want you to do,take the overflow hose frome the radiator,find you a clear pop bottle fill with water stick the hose in there and start the engine and see if you have bubbles( your rad cap have to be on and sealed) If you do your getting compresion in your coolant system,which means you have a blown head gasket,or a cracked head, also you must make sure temp is up to for this test,

Posted on Sep 15, 2009

  • 6982 Answers

SOURCE: 1990 4.2 Jeep Wrangler that is overheating

Still sounds like a bad radiator...new or from scrapyard? If you can't add coolant faster than a really slow dribble that's a big clue.
You can run the engine with the heater on high and the engine should not air-lock. I'd also remove the thermostat just to make sure it is not defective. Run the engine without it and see if it still overheats. Last, it is possible that your head gasket has failed, and engine compression is causing the overheat. I tend to think not only because the hose stays soft.
While it's running, also make sure that the lower hose is not "sucking in" if it is, replace it. On 4.0 engines you can also get the serpentine belt on wrong and it will drive the pump backwards. if you replaced the belt check that too.

Posted on Sep 28, 2009

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  • 37 Answers

SOURCE: have 1990 voyager 3.3 that the engine wont heat

are you using a 190 degree thermostat..do you have a faulty sending unit,also check the heater control valve,make sure you are putting the thermostat in correctly,dont mean to make you sound bad,some of these thermostats are funny

Posted on Dec 12, 2009

miket756
  • 2702 Answers

SOURCE: air slowly bubbles from radiator overflow pipe in the resovoir

well if the rad cap is damaged in any way the pressure in the rad drops its like a pressure cooker, if you open it fast it boils up on you,,,big time! so there may just be a small leak there,,its well worth having a good look at this part first pluss any other pipes and joints if all is good it could be the head gasket starting to go this can be tested for with a sniffer test
to find out if there are any hydrocarbons in the water in the rad,, its an easy test,, if there are any the head gasket is going or gone,

Posted on Mar 03, 2010

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SOURCE: Where is the bleeder valve for the radiator on a

SATURN USED A PRESSURE COOLANT SURGE TANK AND A INLET SIDE THERMOSTAT.THEY DONT HAVE BLEEDER SCREWS.YOU NEED LET CAR SET A LITTLE AT A TIME CRANK ENGINE FOR FEW MINUTES TURN OFF ENGINE.CHECK COOLANT LEVEL WHEN ENGINE SET LONG ENOUGH NOT TO SCALD YOU REMOVE PRESSURE CAP.ADD COOLANT TO SURGE TANK UNTIL LEVEL STAYS AT HOT FULL.WHEN COOLANT LEVEL QUIT DROPPING YOU HAVE THE RIGHT AMOUNT COOLANT.YOUR PRESSURE CAP COULD CAUSE OVER HEATING AND THE THERMOSTAT COULD BE BAD ALSO.

Posted on Mar 27, 2010

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The likely problem is an air bubble in your cooling system. Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. If no bubbles, close the cap. Hopefully this will solve the problem.

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Try this.

With the engine cool remove the radiator cap. Now start the engine and let it warm up to the point where the thermostat opens. You can usually tell when this happens by checking the temperature of the upper radiator hose, and the coolant level in the radiator. It will start getting a lot hotter quickly when it does and the coolant level should drop.

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Hi, 102 seems pretty hot to me. Is the truck not heating up? If you think there is a bubble, here is procedure I recommend:
Recommend you park on an incline, remove the radiator cap, set the heater on high, start the car and let it warm up until there is flow in the radiator. Fill the radiator and keep it full while the engine continues to run. Look for any bleed ports the system may have either in the hoses or at the attach point housings. Crack any bleeders open to allow any air out. Top off the radiator all the way to the neck and make sure there are no bubbles coming up. Bubbles coming out the radiator are an indication of a blown head gasket. If no bubbles, close the cap. Hopefully this will solve the problem.

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Not computer. You have air in the cooling system. Bubble is moving around. Park on an upward incline, take the radiator cap off, run the engine and keep the radiator full. Let it warm up and let the thermostat open (until you see flow in the radiator). Then fill to the brim and keep full until it stops going down. Also open any bleed ports you can find in the cooling system (there may not be any) and let any air out of them. Let the engine run and check for any bubbles that continue to come out. If bubbles continue to come up, you have a blown head gasket that is forming the bubble and causing the heater and temp gage issues. If bubbles do not come out, maybe you have fixed the problem by getting all the air out. Please let me know if you have any questions.

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You need to make sure there is no air trapped in the system. I assume you flushed the radiator when you changed the thermostat. I also assume you installed fresh coolant mixed 50/50 antifreeze and distilled water. I also assume you installed the thermostat correctly with the spring facing the engine. Look on the upper part of the cooling system and the engine for bleeder valves (If Equipped). Now remove the radiator cap from a cold engine and make sure the radiator is totally full. Set the heater temperature control to HOT. Start the engine and look for escaping air bubbles from the radiator. Keep the coolant level full at all times. It will take awhile for the thermostat to fully open so be patient. Once you see no more escaping air bubbles install the cap. Wait about 2 minutes with the engine running and use the bleeder valves to remove any more trapped air from the system. Post back if this did not help.

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