Duramax Diesels Forum Truck of the Week
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Old 02-16-2015, 10:39 AM
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Default Dexcool sludge or bad oil cooler?

Just bought a high mileage o2 that was slightly neglected in the maintenance department. I noticed right away there was green coolant in the reservoir and the cap had a brownish green tinted sludge built up on it. I took it to gm to do a flush but they really didn't do a good job. When I got it back the reservoir fluid was still green but the stuff I drained from the radiator was red, and there was still some junk in the reservoir and sludge on the cap. I am going to do a 3 day flush but is there any way to check for sure if I have An oil cooler issue or if it was a coolant mixture issue? Zero pressure issues after the truck sits I don't think it is head gaskets.

PS: Good to be back in a duramax.
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Old 02-16-2015, 11:51 AM
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Sounds like a coolant mixture issue. Dex doesn't mix well with some of the older green coolants and will create sludge. If you're not losing coolant, it's probably not an EGR cooler issue. If you heve an EGR cooler you can bypass it if it's leaking or suspect.
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Old 02-16-2015, 12:03 PM
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Fedaral emmissions truck so no egr. Reservoir is full of this crap.
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Old 02-16-2015, 12:32 PM
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Getting more concerned. Is this the use of a head gasket sealer or can bad coolant mixture do this???
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Old 02-16-2015, 01:09 PM
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Dex doesn't mix well with anything at all really except water

You can always check to see if you are getting coolant into the oil or if the oil level is going down. Chances are though it's just nasty green coolant, I would flush it several times with clean water until you get the gunk out and then go with 50/50 dexcool
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Old 02-16-2015, 01:13 PM
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IMO, yes you have coolant mixture problems. Do as Oregon posted. You've got to flush it all out.
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Old 02-16-2015, 01:43 PM
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Working on it. I pulled the thermostats and they are ate up. Have to get a new I ring for the crossover pipe it's leaking bad and all flat. Once I pick that up I'm going to flush it however many times it takes. Then fresh coolant.
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Old 02-16-2015, 03:56 PM
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Fill it up with water and add the radiator flush additive in and drive for a day or 2. Get it up to temp for a good half hour or more. Then drain it all out and add in the Dexcool. I use CAT ELC with embitterment coolant in mine, it was cheaper for me to get it in a 5 gallon bucket that has a 50/50 premix than the Dexcool premix at Walmart.
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Old 02-16-2015, 04:11 PM
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Quote:
Originally Posted by Ridin'GMC View Post
Fill it up with water and add the radiator flush additive in and drive for a day or 2. Get it up to temp for a good half hour or more. Then drain it all out and add in the Dexcool. I use CAT ELC with embitterment coolant in mine, it was cheaper for me to get it in a 5 gallon bucket that has a 50/50 premix than the Dexcool premix at Walmart.
For $14.00 you can buy 100% walk to the other end of the Wallymart and buy a gallon of distilled and have 2 gallons for $15.00...
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Old 02-16-2015, 08:41 PM
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I bought some 150k prestone yellow/green stuff. Any issues with that since I will have all of the dex gone? Btw, the 2-3 day flush is exactly what I'm doing.
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Old 02-16-2015, 08:57 PM
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Every truck I work on (more so of fords than gms) that i do coolant flushes on, which can be after oil coolers blow, bad coolant, cracked heads etc, I use cascade in the cooling system with tap water. I let the truck idle an hour and let it warm up. Then flush it out. Ill either pull lower hose or open petcock depending on application, and shove the hose in the coolant bottle and let it go wide open. And let it run while its flushing thru. Then ill fill it with cascade again. Go drive the truck for 10 minutes, then flush it all out again, and then fill with correct coolant. The cascade does not bubble, and gets everything out. Oil and everything
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Old 02-16-2015, 11:31 PM
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Right now I have blue devil coolant flush in there with water and thermostats removed. I'm going to run a few days then flush a couple more times or whatever is necessary. I also picked up a new reservoir, cap, and gm thermostats to put in when it's all done. Hoping for the best.
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Old 02-17-2015, 04:56 AM
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Also have heard good results using simple green to flush it out.
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Old 02-17-2015, 06:09 AM
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definetly the mixture is a problem, also you have a sealing problem some where, more than likely your cap is bad dexcool will grow a fungus (the white crusty stuff you see) when exposed to air..... just a fyi once you get it all flushed and a clean system you can use regular green antifreeze, your service interval would be shorter though.... which ain't a bad thing. i would use green all day long instead on dexcool. just my .02.
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Old 02-17-2015, 06:34 AM
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I always replace with Northland Diesel Guard, which is purple and has DCA's in it to protect against cavitation...
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