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Old 10-06-2007, 11:17 PM   #1 (permalink)
thedeatons
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Duramax and the case of the disappearing coolant!!!!

I have a 2006 Duramax LLY that has been fairly good to me so far. Here is the current problem: I fill the coolant up to the line with coolant, either Dexcool or the Prestone equivalent, and then with a couple days (or a nice long hill towing a big load) I get the Low Coolant Level alarm on the dash. I check the coolant, and sure enough it is below the seam in the coolant reservoir.

When I initially fill it up some coolant pours out of the overflow for some reason. I have seen it dripping from the overflow when the engine is hot too....

What could this be? I am tired of having to carry extra coolant with me on every trip. The engine simply does not get that hot, just enough to turn the fan on at times, but nothing out of the ordinary.... Any ideas?
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Old 10-06-2007, 11:21 PM   #2 (permalink)
thejdman04
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Head gaskets, dont shoot the messenger
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Old 10-06-2007, 11:23 PM   #3 (permalink)
thedeatons
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That was the quickest response ever... Okay, now give me an answer that means less money.....???? Any OTHER ideas that it could be MAYBE?
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Old 10-06-2007, 11:24 PM   #4 (permalink)
thedeatons
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Wouldn't I see coolant in the oil or a milkshake in the oil then? My oil looks perfect...
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Old 10-07-2007, 12:55 AM   #5 (permalink)
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The coolant desn't always end up in the oil, I would say have the cooling system pressure checked, If it passes I would say you may be onto more expensive options. I have been there man, it is a brutal feeling when these issues start up

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Old 10-07-2007, 05:35 AM   #6 (permalink)
MKAH
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I agree, the head gasket.
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Old 10-07-2007, 10:30 AM   #7 (permalink)
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its pry a head gasket, it could be a cracked head, warped head, warped block etc.
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Old 10-07-2007, 11:02 AM   #8 (permalink)
saratoga
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Quote:
Originally Posted by thedeatons;2049053;
That was the quickest response ever... Okay, now give me an answer that means less money.....???? Any OTHER ideas that it could be MAYBE?
Since I doubt you're over 100K mi, take it to the dealer and have them fix it. Your Dmax has a 100K, $100 deductible warranty that covers every engine component.

I also agree to the head gasket. Is the surge tank bulging when the engine is running or does it have a black residue in it? Coolant will not usually show up in large quantities in the oil (only detectable by oil analysis) when a forced induction engine blows a head gasket. Most of it will blow out the overflow.
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Old 10-07-2007, 01:51 PM   #9 (permalink)
dmax3500
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are you maybe filling it to much,and maybe you have a bad coolent sensor?,your only sopossed to fill the coolent up to the full line hot ,theres some room for expansion,also you can pressure test the colling system ,,how many miles/kilm's are on your truck?
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Old 10-07-2007, 03:39 PM   #10 (permalink)
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pressure test and you will see. the head gasket can cause the coolant to go in several places. It could also cause your coolant to blow out the resevoir. do your tests and see what it is. be ready though, if you don't see coolant anywhere on the ground or on the block. how many miles on your truck?
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