Question about 1991 Subaru Legacy

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Blew (valve?) on top of radiator

Too much pressure-radiator over heated and steamed up, when I opened it up and on the left side of my 91 legacy it had blown a (screw-valve) that is located on left top, what made that happen. why didn't it go in to the overfolw, any ideas what to fix, keeps overheating and need to plug that hole, what is it called and what caused it

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Driver error. The car is equipped with an idiot light that tells you to shut off the engine if it overheats. They don't call them idiot lights for nothing.

Posted on Sep 28, 2009

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I have a subaru legacy 1990 and its over heating. The radiator is losing antifreeze but the I'm sure its not coming out of the radiator itself. When it started over heating I seen steam coming out from...


I hate to say it but sound like you may have a partial blown head gasket,do you see any water on the ground or is it just evaporating,fill it all the way up (radiator) then leave the top off and then crank it up,if the water shoot up in the air bout to the top of the hood,this is a way to see if the exhaust is coming through the radiator,how is it running skipping or anything,do it steam excessively when you crank it up,out the tailpipe,like more than it use too,I hope I said something to help you.hopefully the head gasket isn't your problem thanks

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My 1998 legacy is overheating, check engine light doesn't come on, could it be the thermostat?


Yes it could, but the cars have a bad reputation for eating head gaskets, so just to be safe, keep your eye on the temp gauge, don't let it over heat, carry water with you. and check for steam out the exhaust when driving, look for oil in the radiator, it will float to the top. A radiator shop can tell you real fast if you have a blown head gasket. We just did one here, found it easier to replace the motor than to do the heads. I have heads if you need them, J25. But on the bright side, could just be low on water. Your thermostat will usually make the engine run cold from being stuck wide open, If it gets stuck in the closed position, it will overheat, pop open the rad cap when warmed up, careful, look to see if the water is moving. If it is, the thermostat is open, will not overheat.

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I just bought a used engine for my 1988 lincoln and its reading history codes of 91, 41, and 34. What are these codes


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Just because it was not hot to the touch, does not mean it is not a coolant loss problem----if the coolant is so low, there may not be enough to make the radiator hot (though usually the steam in the system will).
...a stuck thermostat can also let the engine overheat while the radiator remains cool (the fluid only circulates within the engine and is stopped from getting to the radiator.
...likewise a hose could have burst below and let the coolant out, over heating the engine, and the steam going out the ruptured/popped off hose; would look underneath..
...when cool, check the level in the radiator (likely empty),
...and less than a mile away, may not have ever heated the radiator, though usually only a mile to heat up the coolant
...of course there is always sabotage
...and water pump failure, (so no water circulated) causing overheating and no radiator heat, and possibly enough pressure to blow off a hose, but usually the radiator cap relief spring would allow pressure to escape (and that steam would heat up the radiator on the way---but if only steam in the radiator, it would cool off quickly after venting, because no more water in the radiator to hold the heat. all depending on climate,temp and further details , symptoms..
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I pulled over and steam poured out. I opened the


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The cap you are refering to is actually a screw in bleed cap. My first concern would be why it blew out. I can only think of one reason that much pressure would present is,sorry to say, A blown head gasket. The cap is threaded in and unless it had been cross threaded,I can think of no other reason. I hope this helps. Try to have a good day.

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