Coolant bubbling in recovery bottle!? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-03-2004, 01:07 PM   #1
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Default Coolant bubbling in recovery bottle!?

Its been rather hot here in Colorado the past few days, and after a day of driving around in stop and go traffic with the A/C on I heard this bubbling sound after I shut the engine off. So I popped the hood and sure enough the coolant is having a good old time in the recovery bottle, seemed like it was boiling. Is this normal? I guess I really need to switch over to that 180 stat before my upper intake goes again.
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Old 07-03-2004, 01:30 PM   #2
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That bubbling is not your coolant boiling.
It is your cooling system relieving itself. Yup. Coolant fart.
That'* exactly what your recovery bottle is there for.
When the coolant heats up, it expands and builds pressure. When the pressure is higher than the relief pressure setting of your rad cap, 15 psi in our case. It blows.

Maybe you should replace your rad cap.....and put in a 180 stat with 2 - 1/16" holes in it.
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Old 07-04-2004, 12:25 AM   #3
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Quote:
Originally Posted by 2000SilverBullet
That bubbling is not your coolant boiling.
It is your cooling system relieving itself. Yup. Coolant fart.
That'* exactly what your recovery bottle is there for.
When the coolant heats up, it expands and builds pressure. When the pressure is higher than the relief pressure setting of your rad cap, 15 psi in our case. It blows.

Maybe you should replace your rad cap.....and put in a 180 stat with 2 - 1/16" holes in it.
Always a good idea... maybe not a holy 180 stat since he does live in colorado but a 180 should definatly keep coolant running thru the engine to keep it cool to stop that from happening.
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Old 07-04-2004, 03:57 AM   #4
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Whoa, it CAN BOIL, and will if your fans aren't running in warm stop and go driving. Turn on the AC to see if the fans kick on. If not, replace the fuse or find out what else is wrong. Coolant can bubble a little, but if there is a lot of loud bubbling, it'* a problem.

This has happened to my fiance'* SE.
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Old 07-04-2004, 02:47 PM   #5
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Yea, the weather is crazy here...

Anyway, thanks for the info, both of the fans work fine and the gauge hangs around 200. I'll probably go pick up a new stat and radiator cap tomorrow.
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Old 07-05-2004, 10:04 PM   #6
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Does anyone have a part # through NAPA for the 180 thermostat? Im looking to replace mine also. Thanks!
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Old 07-07-2004, 12:26 AM   #7
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Talk about coincidence.
Yesterday after I parked it and popped the hood, I noticed my recovery bottle bubbling.
Yep, it was my rad cap.
So I installed a new one and cured the problem. :P
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Old 07-07-2004, 04:19 PM   #8
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Quote:
Originally Posted by jwikoff99
Whoa, it CAN BOIL, and will if your fans aren't running in warm stop and go driving. [...] Coolant can bubble a little, but if there is a lot of loud bubbling, it'* a problem.
Ayup, the point of having a pressure cap is to prevent the coolant from boiling at its operating temperature. If it'* boiling, get the cap tested for leaks (i.e. something is allowing the system pressure to fall). This is assuming that your coolant strength (its boiling point) is up to where it should be, too.

Another possibility might be that you've got a large air pocket in the cooling system, and you're seeing the burpage as the remaining system coolant expands and pushes some of the air into the surge tank. When the engine'* stone cold, remove your radiator cap and make sure that the radiator is completely full, and that the coolant level in the overflow (surge) tank is up to the Cold mark where it should be.
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