TURNER Posted February 20, 2007 Share Posted February 20, 2007 Advice Needed, Air Is Getting Into My Cooling System.when This Happens The Temp Starts To Rise And I Loose Heater Temp. It Takes Several Days Before This Will Happen. I Have Burped It Good And Have New Water Pump, Thermostat, Radiator, Cap. So I Had The Head Gaskets Changed, Still The Problem Returned. So I Bought Combustion Gas Checker For Checking For Exhaust Gas In Radiator. The Radiator Showed Clean. So How ????? Can Air Be Getting Into My Cooling System ???? Thank You Link to comment Share on other sites More sharing options...
Legacy777 Posted February 21, 2007 Share Posted February 21, 2007 If you aren't using an OEM Subaru thermostat....replace the one you put in with a Subaru one. Check around the forward facing area on the radiator on the passenger side. Over time the plastic will crack, you will lose fluid, and air will enter the system. Link to comment Share on other sites More sharing options...
TURNER Posted February 21, 2007 Author Share Posted February 21, 2007 If you aren't using an OEM Subaru thermostat....replace the one you put in with a Subaru one. Check around the forward facing area on the radiator on the passenger side. Over time the plastic will crack, you will lose fluid, and air will enter the system. THANKS FOR THE ADVISE, I WILL CHECK THE RADIATOR BUT IT NEARLY NEW. I JUST CAN'T UNSTAND HOW WITH MY COOLING SYSTEM UNDER PRESSURE, CAN GET AIR GATHERING INSIDE THE SYSTEM, UNLESS THE COMPRESSION STROKE IS FORCING IT IN. WHICH THE COMBUSTION TEST SHOWS NO COMBUSTION GAS DETECTION. THE WATER PUMP OR IT'S GASKET COULDN'T PULL ANY AIR IN ??? ANY IDEAS ON HOW THIS COULD BE HAPPENING WOULD SURE HELP Link to comment Share on other sites More sharing options...
idosubaru Posted February 21, 2007 Share Posted February 21, 2007 sounds like you're loosing coolant? you'll need to find out where you're loosing it from. pull up the carpet around your passengers side footwell and see if it's wet at all underneath. this would be a sign of a failing heater core. also check and double check all of your hoses. there are MANY tiny hoses running under the intake manifold, through the throttle body, under the alternator, heater core hoses...etc. any one of them can be cracked or have bad clamps. some may requiring removing a few minor parts to get out and check properly. if you can't see any wet spots, try reving the car up to a couple thousand RPM's while looking under the engine. try moving any and every hose you can find, often a small crack won't show itself very easily. particularly at the top of the engine, it won't have fluid in it unless it's full and/or under pressure with fluid circulating. pressing on hoses with the engine running may reveal a tiny crack or clamp that's rusted through the hose. also - how bad did the previous engine overheat? if it was severly overheated there may be block/head issues. were the heads pressure tested before being reused? that's not really necessary unless they were severly overheated/abused. Link to comment Share on other sites More sharing options...
Skip Posted February 21, 2007 Share Posted February 21, 2007 Maybe ?? " I JUST CAN'T UNSTAND HOW WITH MY COOLING SYSTEM UNDER PRESSURE, CAN GET AIR GATHERING INSIDE THE SYSTEM" Gad that is hard to read. If the system looses some coolant by one of the methods Leg777 or Gary mentioned. When the car cools off and the coolant contracts, it will pull air in either from the leak or the overflow bottle (if it is empty). Hope this helps. Link to comment Share on other sites More sharing options...
nipper Posted February 21, 2007 Share Posted February 21, 2007 What Skip Said. The cooling system is only under pressure when its hot. As it cools down it sucks back in the coolant in the resivoir. If it consumes all that liquid, then it will suck in air. nipper Link to comment Share on other sites More sharing options...
Legacy777 Posted February 23, 2007 Share Posted February 23, 2007 I know it may be a dumb question, but when you're bleeding/burping the system, are you removing the bleed screw on the passenger side of the radiator? Link to comment Share on other sites More sharing options...
nipper Posted February 24, 2007 Share Posted February 24, 2007 yes. Dont forget to put it back. Dont loose it either nipper Link to comment Share on other sites More sharing options...
calazo Posted February 25, 2007 Share Posted February 25, 2007 Well, I don't know if this is the case for U.S. versions, but I've had overheating problems with our two Legacys (1991, 2.2L & 1993, 2.0L). The solution for both cars was to install radiators with more capacity or just have a bigger radiator custom-made. As for the air getting into the cooling system, I think it is also a Honda's problem (I own one BTW). I had to replace most of my Civic's cooling system hoses... Link to comment Share on other sites More sharing options...
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