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'90 Legacy Overheats, coolant level not lowering, no leaks...HELP
Posted 15 June 2013 - 12:02 AM
Posted 15 June 2013 - 12:07 AM
Posted 15 June 2013 - 02:02 AM
So you weren't having this problem until after the hose blew roght?
You may have already tried this but turn your heater on when it starts to over heat. I have seen this happen a million times after a hose, thermostat, radiator etc gets replaced. What happens is you get air bubbles in the system and so air gets trapped on top of the thermostat and the coolant doesn't engage the tstat thus causing overheating. Also when you fill your radiator (from the radiator cap, not the overflow) make sure you unscrew the plastic plug on the top left of the radiator. This allows for filling up the radiatar to the fullest because it allows air to escape. This plug is has either a square head or a phillips head. After the air bubbles escape make sure to check the fluids again cause the level can drop. I drive a 90 wagon and this happens nearly everytime I replace something in the cooling system. It happened 2 weeks ago after replacing the tstat, but turning the heater on for a couple seconds did the trick.
Posted 15 June 2013 - 07:03 AM
Also check the function of your fans - are they working? but yeah - kind of sounds like trapped air in the system...
Posted 15 June 2013 - 08:25 AM
Posted 15 June 2013 - 10:45 AM
I had a stuck thermostat; when replaced the problem went away.
Posted 15 June 2013 - 11:09 AM
Exercise proper coolant fill procedire. Full the block by the upper hose first.
Run the heat as if the coolant level is too low, the heat will go cold. Lets say if you had a leak, running the heat is a good way to know when to top off when it goes cold. Even if you have to run the heat in the summer. good luck.
Posted 21 June 2013 - 01:33 PM
Posted 21 June 2013 - 04:24 PM
Posted 21 June 2013 - 08:35 PM
You are putting the cart before the horse here - it could simply be trapped air still in the system coming out - is it still sucking the overflow bottle dry? if it is, then it wasnt filled enough/properly and is still trying to burp itself. the still running to the hot side suggests this as well.
Have you turned on the heat to circulate the coolant thru that part of the system yet? If not, you should.
I would keep an eye on it for a week or two, dont go jumping to conclusions after just a couple of hours.
If you are still getting bubbles after a week or so, then you can entertain thoughts of headgaskets.
Posted 29 June 2013 - 12:25 PM
Edited by ThatSubaruKid, 29 June 2013 - 12:26 PM.
Posted 29 June 2013 - 12:33 PM
An empty system holds 1.6 gallons of coolant. If you didn't pour in at least 1.5 the system is nowhere near full yet.
When filling the system you need to fill the engine through the upper radiator hose Before filling the radiator, otherwise it will take several cycles of running to temp, and cooling and refilling to get the system completely full.
Posted 29 June 2013 - 12:45 PM
Posted 29 June 2013 - 02:14 PM
just for clarification purposes - pull upper radiator hose off the radiator, leaving it attached to the engine, then pour coolant into the engine block thru the hose.
Got it? Good! now go fill your cooling system!
Posted 29 June 2013 - 08:29 PM
Posted 29 June 2013 - 11:56 PM
Top off the radiator then let it idle in the driveway until it reaches operating temp with the cap off. If coolant starts to push up out of the radiator put the cap on it and let it warm to operating temp. Fill the overflow to the MAX line cap the radiator then turn the engine off and let it cool.
Repeat until the level in the overflow bottle stays the same after cooling. This method can take quite some time, which is why I recommend loosening the upper radiator hose and filling the engine up first.
Posted 30 June 2013 - 09:27 AM
Matbe running it low on coolant cause the HG to fail and now you have bubbles. Do they smell like exhaust> Is there an oily film in the radiator cap? The engine can tolerate a mild over heat once, but repeatedly, you may as well count on doing the HG's
Posted 30 June 2013 - 07:26 PM
Posted 30 June 2013 - 08:01 PM
What brand of thermostat did you use? If it wasnt Subaru that's probably the problem.
Posted 30 June 2013 - 09:11 PM
either Subaru brand, or the Stant Exac-stat - part number 48457 - anything else is a waste of money.
Posted 01 July 2013 - 01:27 AM
You MUST only use a Subaru OE t-stat or the Stant Exac-stat - part number 48457. If you use whatever they have at the parts store then you will have issues.
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