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Old 02-04-2009, 08:38 AM   #1
nosajwp
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Default Tried burping the cooling system, but air is still there.

I just had my 30k coolant drain and refill done, and I did the burping procedure I found here, but after the car is cool, I can squeeze the upper radiator hose and still hear a small air pocket moving around in there. My temperature gauge always stays where it's supposed to. Should I be worried about the air pocket? Any tips on how I can get rid of it?
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Old 02-04-2009, 09:55 AM   #2
Tahoe SC
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being at the very top and at the end of the return hose shouldn't cause you any overheating issues. it's not going to work its way down and backwards into the system but upwards and towards the radiator. if you're really concerned, you can try opening up the cap and then massaging the lower portion of the hose to squeeze coolant and the air pocket into the radiator.
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Old 02-04-2009, 01:29 PM   #3
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I find all the air works its way out of the system after 20 or 30 miles. Just keep an eye on the coolant level in the reservoir, it will get lower as the air escapes so you will need to top it off.
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Old 02-04-2009, 11:10 PM   #4
shep21
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...my 07 was really tough to burp when I put the stock turbo back on (putting the vf39 on it was cake) but try the burping procedure again but with your nose parked uphill. it helps.
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Old 02-07-2009, 09:41 PM   #5
nosajwp
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Anyone else have any ideas?
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Old 02-07-2009, 11:21 PM   #6
shep21
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^did you try my uphill method?? I found that to really help.

If not just do it again. you are using the procedure where you hold the engine at 3k for several minutes, etc? and you are removing the cap from the turbo reservoir and not the radiator correct?

...this does require some patience, but if its really not working check for leaks in the system where you could be sucking air.
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Old 02-07-2009, 11:23 PM   #7
shep21
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oops you didn't say what kind of vehicle, I just assumed wrx. so you may not have a turbo reservoir lol

...also just drive around with a bottle of coolant and keep an eye on the gauge, it should purge the air to the highest point as you drive. good luck.
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Old 02-09-2009, 02:56 AM   #8
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to burp my system, I just left the radiator cap off while the engine was running. turn off and repeat. leaving the cap off lets out the excess air while the car is running. also its a good time to add the conditioner if your wrx requires it.

also when you pour coolant in, do not pour it fast. slow and steady does it and prevent trapped air.
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Old 02-09-2009, 03:33 AM   #9
MannyMohawk#5
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Quote:
Originally Posted by Roamrex View Post
to burp my system, I just left the radiator cap off while the engine was running. turn off and repeat. leaving the cap off lets out the excess air while the car is running. also its a good time to add the conditioner if your wrx requires it.

also when you pour coolant in, do not pour it fast. slow and steady does it and prevent trapped air.
Exactly what I do and it works every time. Roamrex knows what's up.
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Old 02-09-2009, 10:35 AM   #10
shep21
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^that is what I do for most other cars, however on a WRX the turbo reservoir is the highest point in the cooling system, and therefore you should remove that cap rather than the rad. cap, but hey whatever works! I guess it depends on where the air is. like I said sometimes its super easy to burp, and sometimes it takes awhile.
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Old 02-09-2009, 12:27 PM   #11
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Quote:
Originally Posted by shep21 View Post
^that is what I do for most other cars, however on a WRX the turbo reservoir is the highest point in the cooling system, and therefore you should remove that cap rather than the rad. cap, but hey whatever works! I guess it depends on where the air is. like I said sometimes its super easy to burp, and sometimes it takes awhile.
Only way that worked for my WRX. Just make sure that the lower cap is on when you take the upper cap off. (it had been a long day o.k.) RP
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Old 02-09-2009, 12:35 PM   #12
Tahoe SC
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not sure if this works on cars, but for motorcycles, i would rev it up nice and good several times. this opens up the t-stat and sends the coolant rushing through the system, forcing out any trapped bubbles in the block and hoses.

anyone know if the same principle can be applied to cars? i think when we go WOT, the t-stat opens right?

T
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Old 02-09-2009, 02:02 PM   #13
shep21
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Originally Posted by Tahoe SC View Post
not sure if this works on cars, but for motorcycles, i would rev it up nice and good several times. this opens up the t-stat and sends the coolant rushing through the system, forcing out any trapped bubbles in the block and hoses.

anyone know if the same principle can be applied to cars? i think when we go WOT, the t-stat opens right?

T
absolutely, in fact you are supposed to hold engine rpms up for several minutes, I believe they say 1500rpm or there abouts, several times.
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