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Old 09-28-2010, 03:13 PM   #1 (permalink)
l_wolden
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Losing antifreeze, heater not working right???

I have a 2005 GMC 2500HD Duramax turbo diesel 6.6L. My truck is not overheating at all but the temp will go down and back up but never over 210. We are losing antifreeze out of the overflow hose and the heater blows hot one minute and cold the next. It shows no signs of the heads or head gaskets being bad, the oil is not white and there are no leaks from the exhaust. If anyone could help us out that would be great, we have already changed both thermostats on it.
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Old 09-28-2010, 04:03 PM   #2 (permalink)
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Sounds like bad head gaskets! I suggest you let it set overnight, and then feel the top radiator hose-- if it is still hard, you probably have a bad head gasket.

The reason the heater does not work-- there is air (combustion gases) in the system and that does not transfer heat like coolant does.
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Old 09-29-2010, 05:05 PM   #3 (permalink)
l_wolden
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Ok well I felt the top radiator hose and I was able to squeeze it, but this truck has not been ran. Does it need to be ran before you do this? We haven't been driving it since we have been trying to figure out what is wrong with it.
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Old 09-29-2010, 05:08 PM   #4 (permalink)
l_wolden
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Ok well I felt the radiator hose and I was able to squeeze it, but this truck has not been ran. Do we need to run it before we do this? Also, how do you get these combustion gases out of it?
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Old 09-29-2010, 09:12 PM   #5 (permalink)
gmcmax05
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Quote:
Originally Posted by l_wolden View Post
Ok well I felt the radiator hose and I was able to squeeze it, but this truck has not been ran. Do we need to run it before we do this? Also, how do you get these combustion gases out of it?

What he's trying to say is, if the headgaskets are shot, you will be pressuring up the cooling system with compression from the cylinder(s) that the headgasket is leaking from. If that's the case, replacing the headgaskets is required.
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Old 09-29-2010, 11:39 PM   #6 (permalink)
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Originally Posted by l_wolden View Post
I have a 2005 GMC 2500HD Duramax turbo diesel 6.6L. My truck is not overheating at all but the temp will go down and back up but never over 210. We are losing antifreeze out of the overflow hose and the heater blows hot one minute and cold the next. It shows no signs of the heads or head gaskets being bad, the oil is not white and there are no leaks from the exhaust. If anyone could help us out that would be great, we have already changed both thermostats on it.
Same problem I experienced, it turned out to be heads and gaskets. GM was responsible for the repair at the time. The truck ran very hot on occasion!
Use the advice on the upper rad hose, don't start the truck overnight. In the morning go squeeze the upper rad hose, if its hard then you can bet on HG!

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Old 09-30-2010, 04:11 PM   #7 (permalink)
l_wolden
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Ok well the truck hasn't been started for a week and when I checked it I was able to squeeze the radiator hose. So now what? I called GM my truck only has 77,000 miles on it and they wont cover it under the warranty it just expired like two months before this happened
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Old 09-30-2010, 07:49 PM   #8 (permalink)
goatcheese
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Run the truck with the antifreeze cap off and look for bubbles in the reservoir. if you see bubbles, your in trouble. while its running Let it warm up a bit, shut the truck off and check the upper rad hose in the morning. If is hard, quite possibly HG.

When I bought my truck i knew the hg were gone, I don't know how long it was driven this way, but the head was badly pitted. GM had to put a brand new head on it. They said it was from the hg leak. So the sooner you figure out if it is the HG, the better. Mine was #8 , it could hardly hold any pressure when they did a leak down.
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Old 10-01-2010, 10:01 AM   #9 (permalink)
l_wolden
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Ok I will give that a try. Thank you I will let ya know what happens tomorrow then.
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Old 10-03-2010, 10:12 AM   #10 (permalink)
l_wolden
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Ok well I ran the truck and went out in the morning before we started it back up and could still squeeze the radiator hose? I made an appointment to take it into the shop again but a different one now to get it tested. I am really hoping they figure this truck out.
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