why does it belch water? - Team Camaro Tech
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post #1 of 8 (permalink) Old May 20th, 07, 03:40 PM Thread Starter
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why does it belch water?

Hi

I got my car to start but I have one problem. When the car builds up heat it belches out of the radiator. It first did this at 160 when I first started it. So I changed the thermostat, and tried again This time it ran for about 5 to 10 minutes and then it belched again. Then I tried it with only filling up radiator about three fourths filled. The car ran at 180 and for about 10 minutes and then belched. I also had the radiator cap off while all this happened.

I have a new water pump, new thermostat, and the radiator was done before I got the car. It has a small block chevy with a turbo 350 trans. Does anyone have a ideaa why this happens?

Thanks

Jerryt
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post #2 of 8 (permalink) Old May 20th, 07, 04:22 PM
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Re: why does it belch water?

sounds like trapped air is releasing from the block somewhere.
try this turn the heat to full hot for awhile while running.
let it burp for awhile then refill the radiator.
you didnt mention if you had a high flow water pump.
if you got one a high flow thermostat is needed aswell.


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post #3 of 8 (permalink) Old May 20th, 07, 04:28 PM Thread Starter
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Re: why does it belch water?

Wow never heard of trapoped air in cooling system but it makes sense. The car is on a slant when I filled it up with water. After a couple of times the car ran better but still burped. Should I fill the radiator to maybe half way so it wont belch all over? Also should I keep doing this till it stops bleching water?.

Thanks
Jerryt
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post #4 of 8 (permalink) Old May 20th, 07, 05:42 PM
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Re: why does it belch water?

You should just run it a couple of times with the cap on, then when its cool take the cap off, fill it back up with water and then check it every few days. It will naturally burp out some water when it gets hot with the cap on and the level will eventually settle out about 1" down from the top of the radiator.

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post #5 of 8 (permalink) Old May 20th, 07, 06:50 PM
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Re: why does it belch water?

Have you looked while it's running and check for bubbles in the rad . You could also have a head gasket gone .
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post #6 of 8 (permalink) Old May 20th, 07, 08:05 PM
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Re: why does it belch water?

I had this EXACT problem. Change the rad cap. The thermo spring in the rad cap is weak.

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post #7 of 8 (permalink) Old May 20th, 07, 09:15 PM
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Re: why does it belch water?

if you don't have an overflow tank, get one.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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post #8 of 8 (permalink) Old Jun 1st, 07, 08:44 AM
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Re: why does it belch water?

I believe it is natural for the radiator to burp a couple of times as the fluid moves from the radiator to the block. This is because your thermostat is basically a valve actuated by heat. Most new thermostats now have a relief "rivet" on the flange to help the purging of air of the cooling system. I suggest you let the radiator burp a couple of times before spending money on more replacement parts. Keep an eye on the temperature gauge when doing this to be on the safe side. What I do to my cars when I change the fluid, is to leave the cap off and get it to operating temperature. I will actually see the fluid evacuate out of the radiator to the block and the heated fluid into the radiator to be cooled. Once I see no more bubbles or air I just put back the cap.
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