Nosure Posted October 30, 2009 Share Posted October 30, 2009 the problem: less coolent in radiator after drive,I need top up everytime when engine is cool(about 250ml sometime more sometime less). the coolent in overflow bottle is getting more and more. so thats mean: coolent flow to overflow bottle when hot, but when cool down the coolent not fully go back to radiator. i did some record. the coolent still go in to radiator when cold but not as much as the coolent from radiator to overflow bottle when hot. say coolent from radiator to overflow bottle 500ml when hot, when its cool down the coolent only come back to radiator 250ml. I went to a few place to check the cooling system. all good. no problem at all. all of them suggest me try to change a cap. then I bought a new radiator cap(1.3bar), nothing changed. but my car never overheat always 75-85degree on PFC. can i just drive like this? don't need really care about it??? I worried the coolent in radiator will getting less and less during time. I got arc radiator and nismo cap. car is r34gtr. anyone help please!!! Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/ Share on other sites More sharing options...
Simon-S14 Posted October 30, 2009 Share Posted October 30, 2009 pressure test the radiator, that will tell you if there is a slow leak or not. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910301 Share on other sites More sharing options...
Nosure Posted October 30, 2009 Author Share Posted October 30, 2009 pressure test the radiator, that will tell you if there is a slow leak or not. already done the test. no problem at all. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910305 Share on other sites More sharing options...
mad082 Posted October 30, 2009 Share Posted October 30, 2009 the fact that if isn't drawing coolant back into the radiator suggests there is something wrong. if you have a new cap, then i would be looking at the overflow bottle or the hose to the overflow bottle. there may be a small amount of debris at the bottom of the overflow bottle that is allowing the coolant to come in, but when it tries to suck it back in it is blocking up the hole and not letting it back in. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910355 Share on other sites More sharing options...
simpletool Posted October 31, 2009 Share Posted October 31, 2009 If it's not the cap then it is likely the tube running form radiator overflow or quite possibly the nipple on the radiator. My thoughts are that the force of fluid coming out of the radiator when hot is high but the force under vacuum for refilling when cold is low. The hole might have corroded or the hose is partially blocked. The hole in my aluminium radiator was blocked from a little bit of crap, I just scraped it out with a drill bit. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910488 Share on other sites More sharing options...
EFI Performance Posted October 31, 2009 Share Posted October 31, 2009 First thing to do is to look for coolant stain's over your engine block, top of gearbox at rear, around hoses ect, my next thing would be respective of head gasket or turbo seals. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910498 Share on other sites More sharing options...
Nosure Posted October 31, 2009 Author Share Posted October 31, 2009 thanks guys, i will try to clean the hose and the hole. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910625 Share on other sites More sharing options...
Nosure Posted October 31, 2009 Author Share Posted October 31, 2009 already clean the overflow bottle. just wait for cooling down hope this help. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4910986 Share on other sites More sharing options...
Nosure Posted October 31, 2009 Author Share Posted October 31, 2009 just checked. its getting better, but still about 100ml coolent less in radiator. maybe some air in system??? but the conlent in overflow bottle is same level as before driving. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4911336 Share on other sites More sharing options...
Nosure Posted November 1, 2009 Author Share Posted November 1, 2009 (edited) its still about 150ml coolent less in radiator. the coolent should be full in radiator no matter engine burn water or not is that right?? if the engine burn water the coolent in overflow bottle should getting lower not the coolent in radiator? PS: I have nismo water pump Edited November 1, 2009 by Nosure Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912445 Share on other sites More sharing options...
Simon-S14 Posted November 1, 2009 Share Posted November 1, 2009 if the motor is using coolant it will use it from the radiator first then the overflow. either you have a small leak which is only evident under pressure or you have a headgasket issue. Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912500 Share on other sites More sharing options...
Nosure Posted November 1, 2009 Author Share Posted November 1, 2009 if the motor is using coolant it will use it from the radiator first then the overflow. either you have a small leak which is only evident under pressure or you have a headgasket issue. even the engine using some coolant does the radiator should still full? and the overflow should get less coolant? Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912514 Share on other sites More sharing options...
Simon-S14 Posted November 1, 2009 Share Posted November 1, 2009 the radiator should always be full. The overflow bottle is an expansion chamber basically when the coolant is hot, it expands and some is pushed to the overflow bottle and then taken back into the radiator once cool. what you need to do, is fill the rad with bleed screw on the manifold taken out til the system is full. then reseal the system, make sure the overflow bottle is filled to the MAX line and then mark it. drive for a few days and then re check it. if you have lost coolant from either the rad or the overflow then you either have a leak or a gasket problem, simple as that Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912556 Share on other sites More sharing options...
Dorigecko Posted November 1, 2009 Share Posted November 1, 2009 better way to bleed system. leave your cap and cock on the top of your manifold off, run the car up to op temp and let all air in the system bleed out thoroughly. making sure your overflow is half full? Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912591 Share on other sites More sharing options...
Nosure Posted November 1, 2009 Author Share Posted November 1, 2009 the radiator should always be full. The overflow bottle is an expansion chamber basically when the coolant is hot, it expands and some is pushed to the overflow bottle and then taken back into the radiator once cool. what you need to do, is fill the rad with bleed screw on the manifold taken out til the system is full. then reseal the system, make sure the overflow bottle is filled to the MAX line and then mark it. drive for a few days and then re check it. if you have lost coolant from either the rad or the overflow then you either have a leak or a gasket problem, simple as that thanks mate but where is the bleed screw?? and how can I do it?? some more detail please Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912601 Share on other sites More sharing options...
Nosure Posted November 1, 2009 Author Share Posted November 1, 2009 better way to bleed system. leave your cap and cock on the top of your manifold off, run the car up to op temp and let all air in the system bleed out thoroughly.making sure your overflow is half full? OK I will try it. thanks mate Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4912612 Share on other sites More sharing options...
Nosure Posted November 2, 2009 Author Share Posted November 2, 2009 will a arc air removal tank able to fix this problem?? anyone know? Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4913448 Share on other sites More sharing options...
Simon-S14 Posted November 2, 2009 Share Posted November 2, 2009 no Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4913489 Share on other sites More sharing options...
Mr. Untouchable Posted November 2, 2009 Share Posted November 2, 2009 dont rule out heater core! Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4913749 Share on other sites More sharing options...
Nosure Posted November 2, 2009 Author Share Posted November 2, 2009 whats that mean? Link to comment https://www.sau.com.au/forums/topic/294265-cooling-system-problem-need-top-up-coolent-in-radiator-everytime/#findComment-4914243 Share on other sites More sharing options...
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