Question about 1990 Subaru Legacy

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Air lock in cooling system - 1990 Subaru Legacy

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  • Anonymous Nov 28, 2008

    I have a 1995 Subaru Legacy and air gets lock in the cooling system, getting the car to overheat, How can i take the air out?

    Thanks.

  • racenut17 Dec 12, 2008

    my thermostat will not open,. i have replaced it , and it still will not open.car stays cool at an idle, but under a load overheats, and lower hose id ice cold even after replacing the stat/ help.

  • veedilord Jan 28, 2009

    i have a 97 dodge ram 318cid motor. after replacing the thermostat now it run hotter than normal[about 230deg] since then i have replaced the stat 2 more times,replaced the pump twice,had radiator cleaned, new heater core, new cap and the bottom hose still stays cold while the top hose is hot but not so hot that you can't touch it, what have i done wrong the truck run great.

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Like the previous poster said, take the cap off the radiator start the car and fill the coolant, also if you recently installed the thermostat make sure its the correct way around, the subarus thermostat is upside down and has to be put in the opposite way than whats written on the thermostat AKA the Rad end goes toward the engine, and the Eng end goes toward the rad... otherwise the thermostat never opens then your left wondering why your engine is glowing orange.

Posted on Mar 13, 2009

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2 things that have worked for me in the past- either lop off the top hose at the radiator end and slowly fill the cooling system from there then top up the normal way (through the header tank) also maybe try cutting off the brass breather pin from your thermostat and refit it.

Posted on Aug 24, 2008

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Many modern cooling systems are best filled using a vacuum filler - a new fangled tool that sucks all the air and remaining coolant from the cooling and heater system and then allows atmospheric pressure to force coolant into every corner of the system.

The traditional method of bleeding the cooling system is to disconnect the heater hose from the cold or return side where it connects to the engine (engine running at a fast idle, heater switched to hot) and be ready to reconnect as soon as coolant flows.
Other hoses sometimes also need to be bled and sometimes removing the temperature sensor can also help.

The air lock is primarily caused by the traditional thermostat jiggle pin being deleted though sometimes this function is replaced by the degassing system.
In the case of a really stubborn air lock or a recurring air lock it is worth checking for a degassing blockage.

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New thermostat, new radiator, system flush, still not much heat??
You need to 'burp' the system to get air locks out.

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    Rad hose has air lock how do you get the lock out..
    When a cooling system has been drained, air is allowed to enter the system. Before refilling the radiator, remove a heater hose or the upper radiator hose and thermostat from the engine side. Then, pour the antifreeze / water mixture into the cooling system until it comes out of the heater hose nipple or thermostat housing. The idea is to vent the air from the system at the highest point possible. This way, air is purged form the system and only liquid is contained. When the liquid just starts to run out, replace the hose that was taken off and finish refilling the system. It's easy, it's free, and it works!And, it could save you from thousands of dollars in engine damage.

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    After searching everywhere all I could find is a page from the actual shop manual instructing you to "Refill cooling system per correct proceedure". Luckily it was very cold outside and as the engine cooled it sucked coolant from the reserve into the system and the next morning I was able to get almost another complete gallon in it. This was enough to get rid of the vapor lock situation and allowed me to drive the car getting all the air out.

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