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Old 06-03-2010, 12:26 PM   #1
alloutSTI
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Have a Nice Day? oh look another coolant thread.... (overheat)

yepp like the title says car is starting to overheat.... ive burped out as much air as i can, no white smoke no sweet smell and no oil in the coolant

now if i drive normal it will last no spillage but if i do any type of spirited or distant driving im loosing coolant from what i can tell its shooting out the overflow tank anytime its under high pressure...

did ARP headstuds and a cometic HG about a year ago no issues until now. any help is greatly appreciated!
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Old 06-03-2010, 01:15 PM   #2
AlaskanProtege
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what mixure of coolent to water? 60/40 is the max i would go. if your in the lower f48 more water the better (better heat exchange) but it sounds either like a bad Tstat or head gaskets
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Old 06-03-2010, 01:26 PM   #3
alloutSTI
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hmmm going to check that

Last edited by alloutSTI; 06-25-2010 at 02:34 PM.
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Old 06-03-2010, 04:02 PM   #4
alloutSTI
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anything else i should pay attn too?
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Old 06-03-2010, 04:07 PM   #5
Udaman
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Bet a headgasket
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Old 06-03-2010, 04:15 PM   #6
alloutSTI
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its not burning it though its just creating alot of pressure causing it to comeout of the overflow.
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Old 06-03-2010, 04:19 PM   #7
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headgasket
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Old 06-03-2010, 04:24 PM   #8
alloutSTI
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even with no smoke no oil/coolant mixture no oil loss no sweet smell out the tail pipe????
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Old 06-03-2010, 04:25 PM   #9
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well im doing an EOA next week as well that should help.
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Old 06-03-2010, 06:54 PM   #10
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cometic headgaskets are prone to push coolant while in boost

next time just stick with oem headgaskets

cometic hg's are for stepped blocks only
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Old 06-03-2010, 07:03 PM   #11
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Quote:
Originally Posted by alloutSTI View Post
its not burning it though its just creating alot of pressure causing it to comeout of the overflow.
If coolant is shooting out the overflow tank due to excessively high pressures, then a headgasket is the only explanation.
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Old 06-04-2010, 02:27 AM   #12
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my motor is out for this exact reason. machine shop found a spot on the block with imperfection at the same place where leak was so now internals have to be removed so it can be decked.
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Old 06-04-2010, 04:18 AM   #13
alloutSTI
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crap im shipping my car stateside in a few weeks i guess no hard driving then its going to have to wait...dammit this is disapointing.... thanks for the help
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Old 06-06-2010, 03:04 PM   #14
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pulled these codes today

P0134 o2 sensor 1
P301 cil 1 misfire
P302 cil 2 misfire
P303 cil 3 misfire
P304 cil 4 misfire
20B0 no code?
P0031 Ho2S heater circuit low sensor 1 ( yes i know my sensor is bad)
P0254 wastegate solenoid low
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Old 06-12-2010, 12:48 PM   #15
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wasttegate code uis because i have the BCS solenoid discconnected..

did a compression test today and read

125
125
126
126
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Old 06-23-2010, 02:48 AM   #16
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I'm have the same issue on a newly built block..... Coolant seems to be spitting into the overflow, maybe i need more coolant than distilled ratio? going to be mega pissed if its a headgasket problem. also, only have P0304 code, not the others. Hopefully figure this out soon. (could be my higher pressure radiator caps? going back to stock asap)

Last edited by iheartmysuby; 06-23-2010 at 03:37 AM.
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Old 06-23-2010, 04:53 AM   #17
alloutSTI
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keep us posted please.
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Old 06-23-2010, 10:48 AM   #18
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Subscribed to the thread.

Yes please, keep us posted.
I seem to be running into the same problem lately.

Does anyone have a good source for an '02 coolant line schematic?
If I have to replace coolant lines, I'd like to be able to do it myself.
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Old 06-25-2010, 02:28 PM   #19
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Well, caps aren't my problem... going to try maybe a new thermostat and a fresh coolant mixture today probably (coolant mix is definitely 50/50 or less by now with filling up with more distilled).. not sure what else i am able to test before i have to tear the whole engine apart. Again, the pressure in the system is causing coolant to come out and fill the overflow tank in my situation.
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Old 06-25-2010, 02:33 PM   #20
alloutSTI
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you want more water then collant or a 50/50 ratio

is your coming out of the overflow tank? kinda confused.
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Old 06-26-2010, 04:30 PM   #21
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UPDATE its still pushing my collant out of the overflow tank but noticed my lower rad hose stay cold and my top one gets really hot, if i drive normally it doesnt really overheat for a good 2-3 hours of driving if i drive hard then its starts pumping itself out the overflow tank
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Old 06-29-2010, 07:18 PM   #22
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I found out what my coolant issue was.
Turns out, the coolant hose had a very small hole that was caused by rubbing against the shield on my air intake.

It was somewhere between user error and poor design. Fixed both.
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Old 06-29-2010, 08:32 PM   #23
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t-stat
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Old 06-30-2010, 05:36 AM   #24
alloutSTI
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Quote:
Originally Posted by BONFIRE074 View Post
t-stat
its started getting hot again would a t-stat that starting to go bad cause the coolant to push out though? or would it just overheat?
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Old 06-30-2010, 11:04 PM   #25
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Today replaced the thermostat and replaced coolant, about a 50/50 mix coolant ratio and used stock caps, instead of the 19psi ones. So far so good, but only drove 20 miles and went to redline a couple of times... do not see anything being pushed into the overflow tank so far.
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