Loosing coolant out of the overflow, overheating...why? - 3000GT/Stealth International Message Center
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Old 08-03-2006, 12:43 AM   #1 (permalink)
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Default Loosing coolant out of the overflow, overheating...why?

I am losing massive amounts of coolant out of the overflow bottle and I dont know why. I thought it would be the thermostat but I just changed it and the thing did the exact same thing. Ill drive around for a little while and coolant will pour out of the overflow bottle. Then the low coolant results in more steam escaping out of the bottle and the needle keeps on rising until I shut it off and add more fluid to it. The only thing I can think of is the radiator being clogged. If that is the case, should I try cleaning it or just get a new one? If thats not the case, then im open to suggestions. Id really like for the car to not do this anymore.
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Old 08-04-2006, 02:49 AM   #2 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

ttt bump
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Old 08-04-2006, 11:55 AM   #3 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

Check for kinks in the line somewhere.
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Old 08-05-2006, 01:34 AM   #4 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

checked everywhere i can think of and everything seems to be cool. any more suggestions? im prob gonna try and yank out the tstat and attempt to flush out the system. the car will idle fine for hours but once i drive the thing it starts peeing out radiator fluid until it steams out empty.
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Old 08-05-2006, 11:02 PM   #5 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

Fans work?

So it can idle fine, but once under load you lose coolant?

maybe a blown headgasket. Thats what the 7M-GTE did to me (it had a hole blown in the head too).
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Old 08-06-2006, 02:08 AM   #6 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

i dont smoke at all, and i can only smell the coolant once it starts pouring out of the bottle. the fans work fine, when the car is idling the fans will come on and the temp will stay within a good range for about 20 mins. i havent let the car idle past that though.
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Old 08-07-2006, 12:15 AM   #7 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

have you checked your coolant pressure cap?? you can squeeze your upper radiator hose and see if you feel any pressure. chances are it will collapse easily. i just started having the same problem, put the car under load, then let off the accelerator, and coolant starts blowing out the overflow. not really sure if it works or not but, i have been told that you can remove the cap, then start the engine, if water blows out of the filler neck, then you have a blown head gasket, if is doesn't blow out, then you have another problem. the coolant filler cap is supposed to maintain somewhere around 13 psi, not much but enough to make the radiator hoses a little firm, so give it a squeeze and see. if your curious as to why that cap would make a difference, fill your radiator up, start the car and let it idle, if the coolant level goes down a bit, fill it again. now, gas it a little and watch what happens when the revs begin to come down. i might be way off the mark here though but it's something simple to check and the part is cheap enough.

ah, just read your original post again. yeah, you may very well have a clogged system with the overheating you are getting.
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Old 08-07-2006, 09:38 AM   #8 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

I had the same problems about 1 month ago - Replacing the radiator cap fixed it. Inspect the gasket on the cap. It needs to form an air-tight seal, or else the unpressurized system will coolant to boil off at lower temperatures.

As others have suggested, check for radiator kinks, fans, and if all else fails, replace the thermostat. Most importantly, CHECK THE WATER PUMP AREA FOR LEAKS. This is unlikely if routine maintenance has been done, but you need to make sure the pump works correctly. Take the T-belt cover off and make sure the pump wheel spins while the engine is running.
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Old 08-07-2006, 09:49 AM   #9 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

+1 for radiator Cap. The system is pressureized at that point from the water pump and the expanding engine components (and water). If it is open all time the flow will simply go straight out.

Also. If you take off the radiator cap and water comes gushing out that should be normal. There is pressure there and with no cap that is the path of least resistance to lower pressure so water will come out. I dont believe this would necesarilly indicate BHG.
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Old 08-07-2006, 09:59 AM   #10 (permalink)
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Default Re: Loosing coolant out of the overflow, overheating...why?

I would also try replacing the radiator cap. That fixed my problem anyways. I bought one of the GReddy ones...GReddy Radiator Cap
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