Will my cooling system "burp" itself? - JeepForum.com
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post #1 of 8 Old 08-09-2019, 07:39 AM Thread Starter
joeyroe
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Will my cooling system "burp" itself?

I just changed my thermostat & water pump and don't know whether there's any air in the system. Should I still try to "burp" the system just in case, or will it eventually do it on its own if there's any air?


Thanks in advance.

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post #2 of 8 Old 08-09-2019, 07:56 AM
Newtons3
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Properly functioning, it will do it itself. However, if there is considerable air behind the thermostat, it can result in some less than desirable effects initially. I always cycle the cooling system through the initial opening of the thermostat and then set the fluid level hot (while running) to make sure there are no issues while operating on the road. If you have a bleed hole in your thermostat, a few minutes of running will usually purge most of the air.
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post #3 of 8 Old 08-09-2019, 01:02 PM
TJTurbo
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I've always parked mine nose up while everything is still cold with the radiator cap removed. Once the thermostat opens and you see the coolant moving, give the upper rad hose a few squeezes until you see no more bubbles. Carefully add coolant until the radiator is full. Be mindful of the fan and don't squeeze it so hard hot coolant splashes out on you. Put the rad cap back on, top up the overflow container and your done.

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post #4 of 8 Old 08-10-2019, 08:20 AM Thread Starter
joeyroe
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One more related question...

Ever since replacing my thermostat & pump, I noticed the levels in my reservoir tank no longer fluctuate. Before, levels were always lower at cold, higher at hot....but now it seems to always stay the same (cold or hot).
Is this normal since my engine isn't overheating, or should I try replacing my radiator cap?
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post #5 of 8 Old 08-10-2019, 09:00 AM
Shark_13
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Best to squeeze the upper rad hose a few times and you'll see the bubbles come out.

Fluid should be going in and out of the tank depending on the temperature of the coolant.
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post #6 of 8 Old 08-11-2019, 02:00 PM
TheBoogieman
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It's self burping, like an adult baby.
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post #7 of 8 Old 08-11-2019, 02:12 PM
222Doc
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i would replace the cap when replacing what you did as well. bad cap will make it so it cant bring coolant back in when it cools down. thats the self burping baby part, need to try that on the grand kid.
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post #8 of 8 Old 08-13-2019, 07:01 AM Thread Starter
joeyroe
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Quote:
Originally Posted by joeyroe View Post
One more related question...

Ever since replacing my thermostat & pump, I noticed the levels in my reservoir tank no longer fluctuate. Before, levels were always lower at cold, higher at hot....but now it seems to always stay the same (cold or hot).
Is this normal since my engine isn't overheating, or should I try replacing my radiator cap?
Update:
After burping my system and trying 3 different 18psi caps, I tried a 16psi cap and my reservoir levels are fluctuating again. Go figure (my jeep is weird).
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