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01-06-2006, 12:27 PM | #1 |
Scooby Newbie
Member#: 82910
Join Date: Mar 2005
Location: Springfield, MA
Vehicle:1998 Impreza RS Rally Blue Pearl |
overheating and coolant overflow.
1998 RS 2.5L 121k
So the other day i got in my car to go out for a drive, let it warm up and all like normal. I finally get going and I have no power, the car is moving but i when i step on it there is no power, and I'll admit I didn't notice the CEL right away. Anyway, I get it home and have my buddy come over and scan the car, and the code was P-1507 Idle something or other. We then take a look at the engine and there is no coolant in the reserve or radiator(that we could see). So we add coolant and think the problem is solved. So we go out for a drive, get a bite to eat. The car seems to be good, no CELs and has full power. So I do for another drive in the car,(it just had snowed so I wanted to have some fun) and I'm out in a part of town where there is nothing and I have alittle fun and then i notice that my heater wasn't heating up at all. I looked down and I was on the H. I didn't want to shut the car off, seeing I didn't have my phone and it was snowing out. So i drove VERY slowing and at low low rpms until I was around houses again if I could get the car started again. Anyway let it cool down and the drive home and it overheated again on the way home. So I get home and check the coolant reserve tank and its empty and there is coolant everywhere, battery and all over the reserve tank and below. I finally got another look at it all again today. I haven't driven the car since that night before, but I had filled up the coolant to see if it was leaking when just sitting there. NOPE. So I let the car warm up again today, after about 25minutes of warming up and not over heating I go for alittle drive again and sure enough about 5-10 minutes in the car over heats again and the reserve tank is overflowing. I'll be honest I'm not the best mechinic but I have an idea with somethings. WHAT IS WRONG? I can't figure it out. BTW the headgasket was done at about 32k by other owner. Thanks in advance
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01-06-2006, 12:56 PM | #2 |
Scooby Specialist
Member#: 68340
Join Date: Aug 2004
Location: Mill Creek, WA
Vehicle:2006 WRX SMG |
if the headgasket was replaced right, and it wasn't bad then its either u have an air buble in the system not allowing u to add enough coolant/water, or the cap is not holding pressure and it leaks coolant, but again the car holds about 2 gallons of liquid so i am thinking u have a bad headgasket. check ur oil for any coolant, or try to trace a leak somewhere in the system, drain ur coolaing system and refill maybe that will fix ur problem
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01-06-2006, 05:13 PM | #3 |
Scooby Specialist
Member#: 6178
Join Date: Apr 2001
Chapter/Region:
MAIC
Location: Singletracks
Vehicle:98 GM67 2 whls > 4 whls |
As drmichael said, check the oil for coolant (white bubbles, looks like chocolate milk upon draining) and look for oil in the coolant.
Check the thermostat to make sure it is working properly and has not failed closed (like the OEM do). What would ultimately help is a leakdown test to see where there might be an issue between the cylinder and head. You would be able to narrow it down to a cylinder(s) and treat the problem accordingly. Hear air through the oil inlet tube? --> leak through that portion of the headgasket hear air through the radiator? --> leak through that portion of the headgasket. The gasket may very well have failed again, it is hard to say without doing a leakdown or at the least, compression check. From the sounds of things, it might be another headgasket issue. AJ |
01-06-2006, 05:19 PM | #4 |
Scooby Newbie
Member#: 78147
Join Date: Dec 2004
Location: Out of my mind
Vehicle:93 impreza 4dr 280.000 and runs 100+ |
Blew another head gasket or cracked something
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01-06-2006, 05:23 PM | #5 |
Scooby Guru
Member#: 90347
Join Date: Jul 2005
Chapter/Region:
AKIC
Location: Anchorage AK
Vehicle:2013 BRZ & Imp 2.5RS Yamaha FZ8 |
An internal headgasket leak at the cylinders can cause compression/combustion to press through the coolant tubes... causing the coolant to come out of the only available opening... The overflow bottle. I've seen this a lot with Legacy 2.5 engines. But the concept is the same. It would explain why you have coolant all over the place. My bet is internal leak at the headgaskets. A compression test would tell you if it was left or right side.
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01-06-2006, 05:54 PM | #6 | |
Scooby Guru
Member#: 3148
Join Date: Dec 2000
Chapter/Region:
TXIC
Location: DFW, TX
Vehicle:12 Ford F150 EB 00 BRP 2.5RS (again) |
Quote:
It should be added that there is a tiny little hole on the overflow bottle on the side facing the radiator... you can't see it when the bottle is on the car, but this is where my mystery coolant was coming from... the leak out of the hole + the wind speeds while driving = coolant just about every where. |
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01-06-2006, 08:24 PM | #7 |
Scooby Guru
Member#: 90347
Join Date: Jul 2005
Chapter/Region:
AKIC
Location: Anchorage AK
Vehicle:2013 BRZ & Imp 2.5RS Yamaha FZ8 |
Definatly agree with you Texas, replace both as the cost to do both is cheaper in the long run then doing one at a time. Its also a good time to change a timing belt if you need one. Its all apart anyway
And of course while its apart, check and make sure there is no damage caused by it overheating. Check the surface of the heads and block for any sign of them being warped. |
01-07-2006, 11:41 AM | #8 |
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region:
Tri-State
Location: USA, North NJ, 07456
Vehicle:1998 Legacy 2.5GT Silver Sleeper BK, 5MT |
As stated above...it's almost guaranteed you lost a HG.
If it was done @ 32K miles, it may not have had the "latest greatest" HG's installed, thus they went again. It is not "hard" to do, but it is very easy to do it wrong as well. Getting the block and head mating surfaces flat (within ~.0015" or better) is important, as well as getting it torqued up right. I have done it before on these engines, and my highest mileage one is at ~90K miles and going strong on replacement HG's. If you get it done again, do the front and rear crank seals, check to see if you have a plastic or aluminum (preferable) oil seperator plate and look at doing the clutch/flywheel as well. A compression test may not tell you anything at this point. Oil in the coolant and/or coolant in the oil may also not tell much. The biggest 2 common identifiers are: 1-loss of coolant (and bad performing heater) 2-bubbles in the overflow tank with the cooling system filled and the engine running @high idle or more while it is warmed up. |
01-07-2006, 12:19 PM | #9 |
Scooby Newbie
Member#: 78147
Join Date: Dec 2004
Location: Out of my mind
Vehicle:93 impreza 4dr 280.000 and runs 100+ |
After reading TSBs from Ford, GM, Chrysler, and most asian manufacturers on the subject I ALWAYS replace the headbolts too. Might not be as critical on cast iron heads / blocks but I do them anyway. I hate come backs.
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01-07-2006, 12:36 PM | #10 |
Scooby Specialist
Member#: 22462
Join Date: Aug 2002
Chapter/Region:
SWIC
Location: Phoenix , Az
Vehicle:2001 AutoFozzyFTW SilvernBlack |
When was the themostat last replaced ? It could be sticking .
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01-07-2006, 12:53 PM | #11 |
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
It can't hurt to try a new T-stat and new radiator cap, but I'd bet a month's pay that it's a blown head gasket or two. As Charlie said, when the HGs were done at 32k Subaru might not have begun utilizing the new 4-layer gasket, so the old style was used and they were eventually going to blow again. On my car, the first set went at about 59k, was replaced using the original 3-layer style, and they went again less than a year later at about 76k. At that point the new 4-layer gaskets were put in, and 80k miles later (including plenty of auto-x runs, drag strip runs, and open track days) they're still holding just fine.
Pat Olsen '97 Legacy 2.5GT sedan |
01-08-2006, 09:08 AM | #12 |
Scooby Guru
Member#: 3148
Join Date: Dec 2000
Chapter/Region:
TXIC
Location: DFW, TX
Vehicle:12 Ford F150 EB 00 BRP 2.5RS (again) |
When you replace the HGs, replace:
1. Timing belt 2. Both accessory drive belts 3. Upper and lower radiator hose 4. Thermostat 5. Radiator cap 6. Overflow hose Pretty much all of the wear-and-tear items that you have to remove in the process of replacing the headgaskets. |
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