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Old 11-26-2008, 08:18 PM   #1
scprs
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Default im clueless (coolant issues)

ok so i dunno wats happening. Let me say i am not over heating, have heat all the time, no overflowing. however ive noticed bubbles in the overflow tank at idle and when car is off still bubbles but moving much slower. The coolant level in the overflow tank was dry one day but 3/4 full the next and today it was pretty stable (i drove an hr and the level stayed the same and didnt overflow). Let me say again it is not overflowing!!!! I also checked the main resevior and it was normal.


Possible i have a small airpocket?.....i thought hg issues caused overheating and overflow issues someone fill me in also i just changed my oil with 10w30 redline and dont feel like changing the oil again to see if there a milkshake (thats not cheap lol)


Thanks for any input
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Old 11-26-2008, 08:35 PM   #2
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Flush the system
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Old 11-26-2008, 08:52 PM   #3
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it shouldn't be bubbling in the overflow tank (pretty much ever) - when you remove the radiator cap (while the system is cool) is it full of coolant, or is there an air bubble? If you are pushing air out of the coolant system (and it was full before) then you could have a head gasket issue, or some other leak in the system. Have you had the coolant system pressure tested?
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Old 11-26-2008, 09:06 PM   #4
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well i was having trouble before but (overflow issues) and turned out subaru gave me the wrong radtiator cap lol so i put the new one on but didnt get the system flushed. I did have a leak down test done and showed nothing. But if im not over heating, overflowing, and have heat all the time. WTF could it be (bubbles and fluxuation)
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Old 11-26-2008, 09:24 PM   #5
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Well - it's normal for the level in the overflow tank to fluctuate (should go up as the coolant temperature increases (the coolant expands with temperature)), but it should not ever bubble - if there is air in the coolant system, it had to come from a leak somewhere.

There is no need to flush the system (unless you have been using tap water, and have lots of scale buildup or something like that) as long as you have been keeping on top of maintaining the system.
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Old 11-26-2008, 09:29 PM   #6
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yea the HG's were replaced june this year...so its been flushed once then and another time when i got new radiator hoses. How much is it supose to fluctuate? Also where else could the air be coming from (radiator maybe) cause i not sure also would a bigger over flow tank work (someone mentioned it to me)
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Old 11-27-2008, 09:48 AM   #7
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I'm not sure how much is is supposed to fluctuate, but I've noticed that if you have it filled to the full line cold, it will rise maybe 2-3" hot (that's a back of the envelope guesstimate - I haven't actually measured)
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Old 11-27-2008, 10:54 AM   #8
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talking about the over flow tank or the turbo resevior? i would say thats quite a bit if so then maybe im just crazy lol but still doesnt explain my bubbles that is wats confusing me
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Old 11-27-2008, 03:41 PM   #9
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Quote:
Originally Posted by scprs View Post
talking about the over flow tank or the turbo resevior? i would say thats quite a bit if so then maybe im just crazy lol but still doesnt explain my bubbles that is wats confusing me
the overflow tank is the unpressurized white plastic one on the drivers side of the radiator (not the tank on the top of the engine near the turbo - not having x-ray vision, I can't see inside that one - plus, it should always be completely full with no air bubbles at all - just like the rest of the coolant system. The tank near the turbo represents the highest point in the coolant system - if you pull the cap and there is air space, then you need to fill it up with coolant)
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Old 11-27-2008, 05:44 PM   #10
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i got an 03 with the black cylindrical one. i feel like if i fill the overflow tank its gonna overflow
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Old 11-27-2008, 06:51 PM   #11
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If you are getting air bubbles in the reservoir it is most likely due to a head gasket leak during the high pressure of combustion. I know you said the gaskets were done and have done a check but I don't know any other way that bubbles like that can happen. If trapped air is just being purged it should go away at some point.
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Old 11-27-2008, 08:10 PM   #12
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i have arp head studs is it possible thats the cause? like need to be torqued again. also is it possible to have a hg leak and no overheating
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Old 11-27-2008, 09:46 PM   #13
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Quote:
Originally Posted by scprs View Post
i feel like if i fill the overflow tank its gonna overflow
you don't fill it all the way - just to somewhere between the high and low mark on the side of the tank. I have always made sure mine are filled to the high mark when I get a chance to check, and it has never, ever, even been sort of close to overflowing. It only rises a few inches as the coolant heats up and expands.
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Old 11-28-2008, 07:32 AM   #14
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ok so on the way to work today before i started the car i filled the resevior buy the turbo so it would be air tight. The over flow tank was empty. I got to work which was 30 to 40 min away and checked it and it was full but not overflowing with slight bubbles. No overheating, and no loss of heat. I drove normally never going over 4k another words wasnt pushing it. WTF is goin on im relucatante to have subaru check it because they charge an $$85 diagnostic fee.



Should i get a coolant flush to rid of any air bubbles?
Compression test?
Leak Down Test?
Commpression Test the coolant system?


let me add i was havin a little trouble before and subaru looked at it and the head tech said it was the radiator cap so they gave me a new one and worked fine for a little bit. Did a leak down test came back fine. They didnt wanna do the compression test to save me money and they didnt think anything would come back anyway. Advice please lol I have an 03 wrx internally only comtech HG and ARP Head studs.

PS HG been replaced once In june this year
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Old 11-28-2008, 09:46 AM   #15
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Quote:
Originally Posted by scprs View Post
...The over flow tank was empty. I got to work which was 30 to 40 min away and checked it and it was full but not overflowing with slight bubbles...
you have a problem - that should not happen.
Quote:
Should i get a coolant flush to rid of any air bubbles?
you should make sure the system has been burped, but a flush is unnecessary.
Quote:
Compression Test the coolant system?
Yes! As I mentioned before, that's what needs to be done to see if there's a leak - then they need to find it.
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Old 11-28-2008, 12:08 PM   #16
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You didn't state how much coolant you had to add to the system. I recommend you keep a close eye on the coolant reservoir level. If there is a leakage problem somewhere the level will go down and empty the resevoir. Hopefully now that the coolant is topped off the bubbles will go away also.
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Old 11-28-2008, 02:11 PM   #17
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ima go check it again in a second but it wasnt much that i added maybe an oz not much...Thanks for the info guys il get subaru to monday they to busy today
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Old 11-28-2008, 04:20 PM   #18
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checked it has been sitting since this morning since 7...The overflow tank was pretty much empty and the tank by the turbo was maybe a 1/4 of an inch loss not much.
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Old 11-30-2008, 09:44 PM   #19
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ok so finally overflowed normal driving. And a it was kinda steamy when i opened the overflow cap to look at it. And there was coolant on the hood of the car and on the alt cover so i know it overflowed pretty good. No over heating still and still have 100% heat. Think its headgaskits ot i was think possibly the radiator still has original car has 91000 miles on it
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Old 11-30-2008, 10:03 PM   #20
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do you know how they torqued those ARP studs?
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Old 11-30-2008, 10:49 PM   #21
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dude that installed them said hand tighten....i have heard u have to retorque them after 1000 miles but also heard u just hand do it or tourque it by lbs specs. just dont know wats true. I just cant beleive i would have another hg leak cause i got comtec HG replaced in there (3ply steel) and i have not tracked the car at all so havent been puishing it to cause that just daily driving. (i have uprgraded to stage two since then dunno if that could be it)
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Old 12-01-2008, 05:16 AM   #22
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Sorry to hear that it overflowed. It may be best to have the coolant checked for exhaust gases just to verify the gaskets.
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Old 12-01-2008, 07:17 AM   #23
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yea fin sucks....and now that i think about it the bubbles was a graddual thing. When i got it back no bubbles (mid-summer) then when it started to get cool out it would like pop (one bubble here and there) Then not until recently its like when you put a straw in a drink and blow. Are subarus know for HG problems. This will be the second time
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Old 12-01-2008, 04:40 PM   #24
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The older models were more prone to gasket problems but they made some good improvements after '99. Your replacements should have lasted much longer if the job was done correctly.
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Old 12-01-2008, 04:41 PM   #25
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o it was just found out wat happend Cracked block >:i sucks reall bad was planning on a rebuild just not this soon. Anyone have an sti block
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