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Old 11-05-2010, 08:49 PM   #1 (permalink)
67duramax
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Losing Coolant But good pressure test

I am using a lot of coolant, about a gallon every 10 days. Oil looks good and I cannot find any leaks. I took truck to a shop that works on diesels, they found a hose leaking on top of the engine that runs down on the backside. They said it was dripping and they changed the hose and also did a pressure check on engine and said no leaks, it held pressure. Drove it for a few days and low coolant light back on. I added coolant today, light out, drove for several miles, light on, then light off and parked in drive. Came home later tonight in another vehicle and noticed coolant on driveway. It appears that it blew out of overflow, which has happened before sometime after shutting off engine. But, there is only coolant on the driveway after it blows out of overflow and no other time. There is always pressure on the system when removing the cap, even when the engine is cold. Any suggestions? Head gasket? Could there be a line leaking and burning off before it hits the ground?
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Old 11-05-2010, 08:51 PM   #2 (permalink)
67duramax
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Sorry- 2005 Chevy Crew cab Dually 6.6

2005 Chevey Crew Cab Dually with 6.6 Duramax/Allison. 210,000 miles. Bullydog Triple Dog programmer.
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Old 11-06-2010, 10:19 AM   #3 (permalink)
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Check the upper radiator hose in the morning before starting the truck.

Squeeze the hose between thumb and forefinger - you should be able to about squeeze it closed. If its firm and does not want to close then you are probably in for new head gaskets.

You can also buy a test kit at auto parts stores to check for combustibles in the coolant.

Is there any white smoke in the exhaust?
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Last edited by Shadow1; 11-06-2010 at 10:39 AM.
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Old 11-06-2010, 12:42 PM   #4 (permalink)
chevyduramax
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Sounds like head gaskets are on their way.
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Old 11-06-2010, 02:41 PM   #5 (permalink)
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Why would blown hg cause the upper hose to be under pressure on a cold engine?

Thx.

Last edited by tradin1; 11-06-2010 at 02:42 PM. Reason: Typo
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Old 11-06-2010, 11:32 PM   #6 (permalink)
csmartindale
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If the head gasket failed between the cylinder and a coolant port, the closed system will hold pressure. The upper radiator hose is easy to check and will show a change in size before the smaller hoses. You could open the cap on the de-gas tank, but why would you want to get coolant on yourself?
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Old 11-07-2010, 04:00 PM   #7 (permalink)
67duramax
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new symptom

Found a leak today. The hard pipe that connects to the upper radiator hose and to the thermostat housing tees off and looks like it goes into the turbo. There is a fitting that goes into the hard pipe that connects a 4 inch long rubber hose to what looks like the turbo. Does anyone know if that fitting is replaceable? It has flanges that looks like it can be tightened/removed. I tried to tighten with no luck. It looks like there is a gasket at the mating surface of the fitting and the pipe. This may be where some of my fluid is going but, the upper hose was hard this am. When I opened the cap, and this was before the truck was started for the day,the pressure was relieved and the upper hose went soft. I suppose this still could be a head gasket due to the pressure in the reservoir after sitting all night?
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Old 11-07-2010, 04:03 PM   #8 (permalink)
shookme
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Quote:
Originally Posted by 67duramax View Post
Found a leak today. The hard pipe that connects to the upper radiator hose and to the thermostat housing tees off and looks like it goes into the turbo. There is a fitting that goes into the hard pipe that connects a 4 inch long rubber hose to what looks like the turbo. Does anyone know if that fitting is replaceable? It has flanges that looks like it can be tightened/removed. I tried to tighten with no luck. It looks like there is a gasket at the mating surface of the fitting and the pipe. This may be where some of my fluid is going but, the upper hose was hard this am. When I opened the cap, and this was before the truck was started for the day,the pressure was relieved and the upper hose went soft. I suppose this still could be a head gasket due to the pressure in the reservoir after sitting all night?
You need headgaskets and the turbo thermostat re-sealed.
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Old 11-08-2010, 01:56 PM   #9 (permalink)
Reg DMAX
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i have had that the upper radiator hose has been sucked close (cold) would this been the same theory as it being hard (cold)? and i also losing coolant gallon a month.
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