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Old 08-26-2009, 07:00 AM   #1
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Where does my antifreeze go?

After 3 or 4 thousand miles of driving the surge tank is low by a couple of quarts maybe more. No leaks from radiator or in front no drips on parking pad and none around engine. Engine oil doesn't show water, haven't had it analyised, and no visible leaks in engine compartment. Have put a jug on overflo from surge tank and it doesn't collect anything.

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Old 08-26-2009, 08:33 AM   #2
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If you are loosing antifreeze, there has to be a leak...it just does not disappear. If you recently had the antifreeze changed or the cooling system open, it could have been a bubble trapped and the air has worked it's way out.

Other thing to do is to get an exhaust gas check made for the cooling system to be sure you are not blowing into the system when operating and when it cools draws in a bit of coolant.

Good luck hunting. I had a very small crack on the pressure volume bottle and lost a tiny bit of antifreeze. One day I happened to spot a very small area that had a white build up where the antifreeze would leak very slightly...and not all of the time.


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Old 08-26-2009, 11:08 AM   #3
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Fill it up the coupla quarts low that it is now. Then drive it thru a full heat up cycle. Pull over & check you overflow- you ll find those coupla quarts there. Then check it after you've parked and it has fully cooled- you find those coupla quarts back in the surge tank. If your system is full but doesn't have the overflow, coolant should show in the surge tank peep sight with the engine running; if it doesn't add coolant; if the overly low condition persists have the radiator cap checked for 16# & replace if needed. Better yet, add a coolant overflow tank (do a search on this forum for cheap & easy ideas) and the system will be more forgiving, and you can top off the surge tank when cold, and it should return to a dry overflow & coolant in the peep sight each time you park it overnight.
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Old 08-26-2009, 08:28 PM   #4
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A couple of things to think about, based on experience. Check your radiator cap. If it doesn't hold pressure, the overflow tank may overflow.

I also had an engine with a cracked head. The coolant wound up going out the exhaust pipe.
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