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Old 01-10-2019, 11:20 AM   #1
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Coolant usage?

Any one noticed having any coolant usage in their 8.1ís? Iíve sent an oil sample off last yr and specifically ask to look for coolant and none was found. Occasionally smell a little at start up canít find any leaks looked all over very closely. It has been like this since Iíve owned at 21,000 miles now 31,000. I know some of these 8.1 like to consume oil too.
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Old 01-10-2019, 11:26 AM   #2
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Number one overlooked culprit...radiator cap. Cheap fix, at least worth a try. Buy a good one, Stant or similar.
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Old 01-10-2019, 11:29 AM   #3
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You probably have a leak that is just enough to smell but is evaporating before it drips. You need to look for the telltale markings that the fluid leaves.
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Old 01-10-2019, 11:32 AM   #4
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Coolant usage?

New Radiator cap all the radiator hose clamps snugged canít find any signs of leakage But if I get a little smell it has to be leaking somewhere
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Old 01-10-2019, 12:19 PM   #5
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The 8.1 when it first came out had a problem with the freeze plugs ( on the bottom of the engine) leaking.

I bought a 2003 GMC 3/4 ton truck that had that problem and the dealer corrected it under warranty. I could smell it occasionally until they fixed it.
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Old 01-10-2019, 12:52 PM   #6
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Quote:
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The 8.1 when it first came out had a problem with the freeze plugs ( on the bottom of the engine) leaking.

I bought a 2003 GMC 3/4 ton truck that had that problem and the dealer corrected it under warranty. I could smell it occasionally until they fixed it.


Iíll certainly check that out
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Old 01-10-2019, 04:45 PM   #7
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Iíll certainly check that out


Thinking back I believe I already looked at the freeze plugs on both sides but Iíll have to look at them again.
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Old 01-10-2019, 07:35 PM   #8
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My GMC mechanic son says that Dexcool seems to disappear without a trace. To the point where they will top up a customer's tank and not say anything, because all it does is get people worried about non existent leaks.
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Old 01-10-2019, 08:54 PM   #9
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My GMC mechanic son says that Dexcool seems to disappear without a trace. To the point where they will top up a customer's tank and not say anything, because all it does is get people worried about non existent leaks.
Stan


Are you saying it disappears for no reason or as you say without a trace to where there is no evidence that it had leaked? Asking because you said worried about non existent leaks. Please clarify.
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Old 01-11-2019, 08:55 AM   #10
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The Dexcool disappears for no reason.
They certainly have the technology to detect leaks and when they do check a vehicle that is a bit low in coolant, the detector equipment comes up with - no leaks found.
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Old 01-11-2019, 09:35 AM   #11
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The Dexcool disappears for no reason.
They certainly have the technology to detect leaks and when they do check a vehicle that is a bit low in coolant, the detector equipment comes up with - no leaks found.
Stan


That is very interesting. I did a flush and fill last yr. and installed DexCool again. Maybe a more modern coolant would have been better? Has anyone replaced their DexCool with a newer version?
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Old 01-11-2019, 01:14 PM   #12
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That is very interesting. I did a flush and fill last yr. and installed DexCool again. Maybe a more modern coolant would have been better? Has anyone replaced their DexCool with a newer version?
My Workhorse dealer replaced my Dexcool with a green coolant several years ago, don't know which brand. He is not a fan of Dexcool.
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Old 01-11-2019, 01:30 PM   #13
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Coolant usage?

Quote:
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My Workhorse dealer replaced my Dexcool with a green coolant several years ago, don't know which brand. He is not a fan of Dexcool.


Did he say why? The old green coolant from the 90ís and earlier. That has less modern corrosion inhibitors. I do know you should not mix the old green stuff with Orange DexCool.
Google antifreeze colors and mixing.
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Old 01-11-2019, 01:44 PM   #14
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Did he say why? The old green coolant from the 90ís and earlier. That has less modern corrosion inhabiters.

Don't remember exactly what he said other than there were problems with Dexcool.

I don't think he was using old 90's coolant in 2013.....
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