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Old 02-25-2008, 07:16 PM   #1
sanovichleo
Scooby Newbie
 
Member#: 68099
Join Date: Aug 2004
Chapter/Region: South East
Location: Nashville, TN
Vehicle:
2000 Impreza RSTI
Blue Ridge Pearl

Cool Coolant disappearing, wtf!!!

sup guys, heres my quick story...
i have a sti swap with a stock rs radiator, only 1 fan is hooked up (no a/c)
i went to a track last wkend and the car overheated and lost sum coolant... i filled it back up but ever since ive noticed that its slowly been losing coolant...

I thought there were some air bubbles in the system so i did the recommended procedure and popped the tank near the turbo, filled it up when engine was cool, warmed car up, let it cool back down.... The plastic overflow tank near the battery doesnt change levels, its still full, but the tank near the turbo continues to lose the same amount of coolant everytime after i refill it, warm it up and let the car cool back down... I thought that its just the air bubbles disappearing, but ive done this 3 times and everytime it loses the same amount of coolant at the tank near the turbo. Ive been leaving the cap on as the enigne warms up just as directed in the manual.

Any ideas??? dont wanna say it but it may be head gasket issue if its not the air bubble problem... I am getting a new and bigger rad asap but im concerned that a bigger rad isnt going to solve this problem.

Thanks in advance guys
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Old 02-25-2008, 07:22 PM   #2
sanovichleo
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Member#: 68099
Join Date: Aug 2004
Chapter/Region: South East
Location: Nashville, TN
Vehicle:
2000 Impreza RSTI
Blue Ridge Pearl

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oh and it was weird... i drove the car today,temp was normal while driving... parked and idled for 3 min, temp was still normal, didnt shut the car off and put it in first and 4 seconds later literally right after i pressed the gas temp spiked up to 2/3 H... very weird anyone know what that was about???

and ive had the car now for 2 months w the swap and this is the first overheating issue ive had with the stock rs radiator
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Old 02-25-2008, 10:11 PM   #3
fastnoypi
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Member#: 6886
Join Date: May 2001
Chapter/Region: Tri-State
Vehicle:
MY01 EJ207 HTA35r
nothing to see, i'm stock

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coolant pressure test ftw
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Old 02-25-2008, 10:50 PM   #4
RoadTrippin
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Member#: 161175
Join Date: Oct 2007
Chapter/Region: RMIC
Location: Mountains....
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if it is slow coolant loss I would go with cracked rad, though if you overheated (depending on how bad) you could have possibly blown the head gasket in which case you may have coolant mixing with oil...would appear to be chocolate milkshake on the bottom of the oil filler cap or when you drain the oil. As far as the temp spike chances are after you overheated you probably busted the thermostat so it cant regulate temp anymore....

I would first find out for sure where you are leaking from, UV dyes can help if you cant find it on your own.

Next regardless of where it is leaking from it is always a good idea to replace the thermostat after an overheat (espeically if the head gasket is shot) its a cheap part and better safe now than putting in all new parts only to have the same thing happen again because you didnt replace the real problem.
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Old 02-26-2008, 02:30 PM   #5
sanovichleo
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Member#: 68099
Join Date: Aug 2004
Chapter/Region: South East
Location: Nashville, TN
Vehicle:
2000 Impreza RSTI
Blue Ridge Pearl

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def gonna try to do a leakdown test asap
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Old 02-28-2008, 10:57 AM   #6
sanovichleo
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Member#: 68099
Join Date: Aug 2004
Chapter/Region: South East
Location: Nashville, TN
Vehicle:
2000 Impreza RSTI
Blue Ridge Pearl

Default

well just check the car again, the radiator (stock rs one) is leaking, hopefully thats the only leak lol... that was the only exterior leak that i saw, im going to get a compression check next week to check if the engine was damaged from the overheating issue...

I understand that the heads or block can warp if the car is overheating, but what generally is the time limit for that to happen? I mean how long does the car need to run hot before engine damage can be caused? BC everytime it overheated I immediately turned the car off
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Old 02-28-2008, 10:05 PM   #7
nardvark
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Member#: 145108
Join Date: Apr 2007
Vehicle:
2002 Impreza TS
Aspen White

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Well...I was riding in a mid-90's Contour, and a radiator hose cracked/failed/did something catestrophic. The amount of time was probably <20 seconds between when the needle started to shoot up, and when smoke started flowing over the windshield. Unfortunately we were on windy road so the driver couldn't kill the the power immediately (100 pound woman + no power steering = instant death).

I don't know what kind of engine was in the Contour, but aluminum engines are pretty intolerant of overheating. If you kept the temperature needle well away from the red zone, you're probably OK.
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