Tashi Posted October 25, 2015 Share Posted October 25, 2015 So...yeah, like the title says, I have a mysterious disappearance, or, appearance, of my coolant. My cooling system insists on peeing itself in parking lots. However, we vacuum tested it, and it was fine, we cannot find leaks, and after said parking lot urination, there is not a single wet spot on the undercarriage or motor. There is no anti freeze smell in the cabin and it's not a head gasket. But, it only empties itself on an idle. Anyone have any ideas of how/why this is happening? Link to comment Share on other sites More sharing options...
RaGe Posted October 25, 2015 Share Posted October 25, 2015 is it pushing it back through your overflow tank? OTM. Sorry I didn't mean to start a war which mainly forum people is all about . Link to comment Share on other sites More sharing options...
Tashi Posted October 25, 2015 Author Share Posted October 25, 2015 See, I don't know, by the time I realize it, in about, 10 minutes, all of my coolant will be out, and I will be over heating and the cap will be popping. Link to comment Share on other sites More sharing options...
RaGe Posted October 25, 2015 Share Posted October 25, 2015 your system is pressurizing. how many miles on motor / chassis? OTM. Sorry I didn't mean to start a war which mainly forum people is all about . Link to comment Share on other sites More sharing options...
RaGe Posted October 25, 2015 Share Posted October 25, 2015 and when you say " the cap will be popping " what cap? radiator cap? try replacing the cap. a faulty cap that does not hold pressure will allow coolant to boil over and or overheat. OTM. Sorry I didn't mean to start a war which mainly forum people is all about . Link to comment Share on other sites More sharing options...
Tashi Posted October 25, 2015 Author Share Posted October 25, 2015 The radiator cap only pops when the system is already over heating Link to comment Share on other sites More sharing options...
Tashi Posted October 25, 2015 Author Share Posted October 25, 2015 Also, 210,000KM on the motor and chassis Link to comment Share on other sites More sharing options...
1fast4by Posted October 25, 2015 Share Posted October 25, 2015 Sounds like the head gasket is leaking exhaust into the coolant.. Link to comment Share on other sites More sharing options...
Baddog Posted October 25, 2015 Share Posted October 25, 2015 Upper radiator hose hard when its up to temp? An upper hose hard as a rock is also signs of exhaust gasses into the coolant. Link to comment Share on other sites More sharing options...
Tashi Posted October 25, 2015 Author Share Posted October 25, 2015 But could a leak of gasses into the cooling system cause a complete exodus of coolant at idle in 10-15 minutes, but not when at 4k rpm in 4th gear? Link to comment Share on other sites More sharing options...
RaGe Posted October 25, 2015 Share Posted October 25, 2015 look and see if there are bubbles in your overflow tank when car is running. if there is...HG time. And what steps did you actually take to test the HG? the motor and the system all need to pressurized and have a leakdown done. This can save time and money. After your last statement.....Does your motor make any noises at idle? and rattles? OTM. Sorry I didn't mean to start a war which mainly forum people is all about . Link to comment Share on other sites More sharing options...
Tashi Posted October 25, 2015 Author Share Posted October 25, 2015 The HG was replaced 30,000 KM ago, as well, there is no noise at idle besides the subaru tick, which I hear on every subaru at my local meet at idle. However, after further testing, it only does the extreme evacuation, when the heat is on. My new theory is, a hole in the heater core is dripping the coolant into the Evaporator drain port. As well, on a test, I did, over heat at speed. So, I'm guessing I just don't notice it at highway speed, because of air cooling keeping the last drops of coolant cold enough to not throw off the thermo. Link to comment Share on other sites More sharing options...
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