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Bubbles in coolant reserve tank
Posted 21 September 2004 - 06:02 PM
Posted 21 September 2004 - 06:11 PM
Posted 21 September 2004 - 06:37 PM
Posted 21 September 2004 - 08:49 PM
Posted 21 September 2004 - 10:34 PM
Posted 21 September 2004 - 10:52 PM
Thanks for all of the help, well I went back out and checked it the reserve tank and it appears to have a sligh oil film on the top, f'n a. I'm fecked aren't I? It's only got 67k miles, this is truely dissapointing. Anyone want to buy a 99 Outback? :-\ Well, back to the drawing board. I'm scared to take it in, hell to even drive it.
Very sorry to hear that. Hope for the best.
Posted 22 September 2004 - 02:40 AM
Engine oil in the coolant will form small globules first, and form a thicker layer as it builds up.
A few bubbles coming through is normal. Especially if the coolant is gettting old.
I say: Drain it fully, flush it with pure water, and refill with a good 50/50 anti-freeze, and then keep an eye on the levels.
Posted 22 September 2004 - 11:56 AM
I also have a '99 Outback. Same symptoms occured last summer - a bubble every few seconds. New radiator cap, and the bubbles vanished. I still keep an eye on it, but have had no further signs of the dreaded head gasket failure.
The radiator cap's job is to keep the cooling system under pressure, I think the spec is 13PSI. The boiling temperature of a liquid is directly related to pressure. If the pressure is too low, the coolant will boil. Boiling can occur at hot spots within the engine, and cause local overheating, which may lead to head gasket leaks.
Of course, the reverse is also true - head gasket leaks can cause overheating. Chicken and egg problem - did a failed HG cause overheating, or did the overheating cause a failed HG?
Pressure also increases with temperature - the other part of the rad cap's job is to let some coolant into the overflow tank as the temperature rises, thus keeping the pressure within spec. When the car cools down, coolant is sucked back in from the overflow.
Posted 22 September 2004 - 12:36 PM
Posted 22 September 2004 - 12:43 PM
Posted 22 September 2004 - 01:36 PM
Follow up question(sorry to piggyback on your thread TP), can radiator caps be bad from the start? Is there an OEM Subaru cap, and would it make a difference against a generic? I just got a new radiator, and wanted to ask.
Posted 22 September 2004 - 03:20 PM
TeamPanic, I know how you feel. Whenever I hear just the slightest odd sound from my car I immediately go into panic and assume the absolute worst. It's very stressful, wish I could convince myself to stop!
For the record, my Impreza was bubbling in the coolant expansion tank until I recently drained/flushed/refilled the system. Only replaced the upper and lower hoses, same old rad cap.
Search for "coolant replacement" if you want to read my version of how to do it right :-)
Posted 23 September 2004 - 09:21 AM
The new cap felt tighter than the old one. Not a scientific test, but there was a difference.
Posted 24 September 2004 - 09:09 PM
Hope for your sake it's just a rediator cap. The head gaskets are a BIG problem and perhaps covered elsewhere on this site.
Ok, here's the deal. I have a 99 Outback with 67k miles on it. The car has never overheated. After I drove it for about 15 minutes and reached home I decided to look under the hood. I had the car running and I opened the reserve tank and noticed some small bubbles, not too many, just a few every couple of seconds or so. I was/still am pissed. I've been reading nothing but blown HG stories on here for the last month, so it really made me feel sick to my stomach. Is it normal at all to have some bubbles in the reserve after driving. Also, the coolant looks green and there is no sign of sludge or oil in the reserve tank. Someone tell me some good news please! Thanks
Posted 25 September 2004 - 07:10 PM
Posted 25 September 2004 - 07:25 PM
Posted 25 September 2004 - 07:42 PM
I caught it early. As I said, no overheating. The expansion tank never overflowed, but it did fill up. And I had the telltale bubbles.
Posted 25 September 2004 - 07:58 PM
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