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Re: 95 subaru legacy l with coolant shooting out of...
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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there should be no pressure in a system when the engine is cold
the cap is designed to allow extra pressure to blow off into the over flow reservoir and as the system cols down there is a vacuum created in the cooling system which opens a valve in the radiator cap and draws coolant back from the reservoir
I suggest that yo have a radiator shop test the cap for operation and get a new cap
Those valves sound like fuel pressure test ports. Press down the center of valve and see if gas comes out. If it does, those valves are on the fuel rail, not in the coolant system.
A bleed valve is a bit different. Looks kind of like a grease zerk, with a small hole on its little round head. You put a small wrench on the valve and turn it as if loosening it, but only a turn or two to open it and let coolant or air out the hole on the valve. Look for it on or just close to the thermostat housing. If you have no bleed valve, best practice is to fill radiator and overflow tank, then start car with the radiator cap off, and let engine run until the thermostat opens (upper radiator hose will get hot when thermostat opens). Now turn off engine and replace radiator cap. This usually gets all the air from coolant system, but sometimes you have to do it again.
Most likely your thermostat is stuck open. When you are at highway speed the air flowing over the radiator is over-cooling the coolant. Normally when it's cold outside the thermostat will close, reducing flow through the radiator. It's an easy fix, and not too expensive.
Known head gasket problems on those cars. Suburu dealership have a good product called stop leak. Use that first add a bottle into the radiator run the car to operating temp. Recheck the belly pan for leaks. hope this helps.
cool air and overheating point to low coolant level. Do you have a bleeder valve near the thermostat? You may have air trapped in the system. If no air trapped, the radiator may be plugged up not allowing proper circulation of coolant.