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Old January 2nd, 2007, 17:11
jxj's Avatar
jxj jxj is offline
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0331 Head, Coolant level fluctuates

Ever since reports of cracked heads started showing up I have been watching my coolant level closely every week and inspecting the engine oil for any signs of contamination. No signs of coolant mixing with the engine oil but I have noticed the coolant in the overflow bottle sometimes shows full and sometimes almost to the empty mark. Is this a normal condition with the cooling system? My rig is 2001 (engine build date 01/2001) AW4, coolant is flushed every two years since I bought it new, approx 59k miles. I usually check the level on an even surface (same place every time) to keep things as consistent as possible. Thanks.
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Old January 2nd, 2007, 18:35
rstarch345 rstarch345 is offline
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Re: 0331 Head, Coolant level fluctuates

Sounds like you OK. When the engine get hot the rad coolant expands into the overflow bottle. As the engine cools down it draws coolant from the overflow bottle back into the rad. When my started to go, my cold level dropped about a pint ever 2-3weeks. I never found any in the oil so I really don't know where it went nor did I care. I just decided with coolant mysteriously disappearing, the head was the problem so I changed it. No more coolant problems. Usually the problem shows its head over 80,000 miles and after a severe over heat. Not always, just usually.
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