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Old 12-18-2011, 11:33 AM   #1
Ozz10
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Default Rapidly losing coolant in 99 RS- can't find the leak?

Hey guys,

I've been having a coolant issue for a while. I've been having to refill my radiator every couple of days. It seems to lose coolant even faster when I'm at highway speeds.

I've checked my radiator and heater hoses and none of them seem to be leaking. I've let my car run for 30 + minutes twice with a piece of cardboard under it trying to find the leak and didn't see one drop.

I changed the thermostat yesterday since its easy and cheap, and that didn't help.

I don't think I have a blown head gasket because my car isn't smoking and I never really smell coolant.
sen
I've also noticed that the coolant level in my overflow tank doesn't seem to change when it runs hot. Leading me to believe that its not sending coolant to the overflow tank when it starts to run hot.

My car just hit 160,000 miles

My guesses are that I either have a cracked radiator or need a new water pump. what do you guys think?

What else should I try? Has anyone else experienced similar issues?
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Last edited by Ozz10; 12-18-2011 at 12:38 PM. Reason: added information
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Old 12-18-2011, 12:17 PM   #2
09SubaTrupa
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Had a similar issue, turned out to be the water pump, hope that helps
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Old 12-18-2011, 12:18 PM   #3
cjm5034
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A trick Ive used is to leave the radiator cap off for a few seconds after it starts, if it immediately starts to overflow, the head gasket will need replaced
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Old 12-18-2011, 12:24 PM   #4
Ozz10
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Quote:
Originally Posted by 09SubaTrupa View Post
Had a similar issue, turned out to be the water pump, hope that helps
That's what I'm leaning towards too. Were you not about to find the leak either?

Quote:
Originally Posted by cjm5034 View Post
A trick Ive used is to leave the radiator cap off for a few seconds after it starts, if it immediately starts to overflow, the head gasket will need replaced
I'll give that a try.
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Old 12-18-2011, 06:17 PM   #5
09SubaTrupa
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Quote:
Originally Posted by Ozz10
That's what I'm leaning towards too. Were you not about to find the leak either?
Yea no sign of leak anywhere, coolant would just seem to disappear
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Old 12-18-2011, 09:01 PM   #6
Kolat
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my guess is the tailpipe!


T
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Old 12-19-2011, 10:03 AM   #7
Ozz10
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Quote:
Originally Posted by 09SubaTrupa View Post
Yea no sign of leak anywhere, coolant would just seem to disappear
Must be the water pump then.

I appreciate your help
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Old 12-19-2011, 07:40 PM   #8
lostinthesauce83
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head gasket if you ask me
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Old 12-19-2011, 08:27 PM   #9
09SubaTrupa
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Quote:
Originally Posted by Ozz10

Must be the water pump then.

I appreciate your help
I'm just sayin what my issue was, don't hunt me down if yours ends up different lol
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Old 12-19-2011, 08:29 PM   #10
SedonaScooby
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as stupid as this sounds, you checked your radiator cap?

they have a kit at autozone that you can test it with


I had the same problem and did everything, then randomly checked the radiator cap (even though it was newer and aftermarket) and it was that.
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Old 12-20-2011, 06:31 PM   #11
mamut79
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If you dont see any traces of lost coolant ie: underneath your car ( water pump), trailing from your cap ( on radiator) ....you probably are in my boat, head gasket. Its burning it. I added that coolant leak fix ( melted metal looking fluid with pellets) ...so far almost a year, and no fluid loss.
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Old 12-22-2011, 11:39 AM   #12
Ozz10
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Quote:
Originally Posted by 09SubaTrupa View Post
I'm just sayin what my issue was, don't hunt me down if yours ends up different lol
I understand, I've been thinking it might be the waterpump for a while. No worries

Quote:
Originally Posted by SedonaScooby View Post
as stupid as this sounds, you checked your radiator cap?

they have a kit at autozone that you can test it with


I had the same problem and did everything, then randomly checked the radiator cap (even though it was newer and aftermarket) and it was that.
I'll give it a shot for sure. I'd much rather do that than replace the water pump, radiator, or head gasket haha

Quote:
Originally Posted by mamut79 View Post
If you dont see any traces of lost coolant ie: underneath your car ( water pump), trailing from your cap ( on radiator) ....you probably are in my boat, head gasket. Its burning it. I added that coolant leak fix ( melted metal looking fluid with pellets) ...so far almost a year, and no fluid loss.
So you added the coolant leak fix to your coolant and it seemed to fix (or slow) the leak? I might grab some of that stuff on the way home from work then.

I'll try to keep this thread updated for others to use it as a reference.

Thanks for your help everybody!
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Old 12-23-2011, 12:34 AM   #13
mod maniac
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I see this problem all the time.it is the head gasket,I have replaced at the very least 50 in the last three years.
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Old 12-23-2011, 11:27 AM   #14
kero
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Interestingly enough, I have a 07 2.5i wagon. I loose coolant regularly and under the hood always smells like coolant. I can't see any leaks and the car runs cool, never overheats? Any suggestions?
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Old 12-23-2011, 11:35 AM   #15
Psychoreo
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Let the car get up to temp.

Open the hood.

Rev the engine a few times.

Observe coolant spraying from the top portion of your radiator.

Replace radiator.
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Old 12-26-2011, 07:39 PM   #16
mod maniac
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Quote:
Originally Posted by kero View Post
Interestingly enough, I have a 07 2.5i wagon. I loose coolant regularly and under the hood always smells like coolant. I can't see any leaks and the car runs cool, never overheats? Any suggestions?
Look at the rear of the driverside head find alot leaking right there,add subaru coolant additive.
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Old 12-28-2011, 05:11 PM   #17
kero
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^^ Is this indicative of a head gasket leak? At 47K? Is that additive a sealant?
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Old 12-28-2011, 07:56 PM   #18
mod maniac
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Quote:
Originally Posted by kero View Post
^^ Is this indicative of a head gasket leak? At 47K? Is that additive a sealant?
Yes it's a sealant, it works most of the time
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Old 12-29-2011, 11:39 AM   #19
kero
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^^ Okay, will def go down this weekend and look into getting it? You know how much it is by any chance?
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Old 12-30-2011, 12:39 PM   #20
mamut79
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Quote:
Originally Posted by Ozz10 View Post
I understand, I've been thinking it might be the waterpump for a while. No worries



I'll give it a shot for sure. I'd much rather do that than replace the water pump, radiator, or head gasket haha



So you added the coolant leak fix to your coolant and it seemed to fix (or slow) the leak? I might grab some of that stuff on the way home from work then.

I'll try to keep this thread updated for others to use it as a reference.

Thanks for your help everybody!
it fixed the leak
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Old 01-03-2012, 10:03 PM   #21
bjteel
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I've got a 2002 WRX.

I smelled coolant and had steam coming out of the hood when I got off the highway at an off-ramp.

I just replaced my radiator twice in two weeks (the original cracked on top, the replacement was defective). That's fixed now. New hoses, etc.

Now it is steaming and smelling like coolant again, but only after being on the highway.

I keep finding coolant on the exhaust pipe under the timing belt cover and at the junction where the front and rear timing belt cover comes together, which leads me to believe the water pump is bad (almost 95,000 miles).

Is it possible that a head gasket leak would spit coolant into the front cover?
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Old 01-03-2012, 10:05 PM   #22
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Quote:
Originally Posted by mod maniac View Post
Yes it's a sealant, it works most of the time
HOLD THE PHONE...

Is it possible that because I flushed my coolant and used "non-Subaru" coolant it could be leaking and all I need is a "subaru coolant additive"?
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Old 01-04-2012, 11:58 PM   #23
mod maniac
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Quote:
Originally Posted by bjteel View Post
HOLD THE PHONE...

Is it possible that because I flushed my coolant and used "non-Subaru" coolant it could be leaking and all I need is a "subaru coolant additive"?
It is possible, it's cheap to try.
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Old 01-05-2012, 12:14 AM   #24
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cracked heads, happened to me.
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Old 01-06-2012, 07:50 PM   #25
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go get a coolant system pressure tester from auto zone. Looks like a radiator cap with a hose connected to it and a pump. Pressurize your system to 12-15 lbs and wait. You will find your leak. Thats the easiest and best way to find a leak. If the leak cant be found but you start loosing pressure on the gauge its and internal leak.

remove your spark plugs and drop your oil pan. If the gauge doesnt pressurize (or looses pressure fast) with the plugs removed its a HG or cracked head/cyl wall. If coolant runs out of the motor where the oil pan should be its a block o-ring or HG. You will be able to see the leak though.
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