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Coolant Level Lower After Towing

Coolant Level Lower After Towing

Postby Pipsfc [OP] » Dec 29 2020, 6:59am

About three weeks ago I refilled my coolant because I was getting the warning for low coolant and it indeed looked low. I followed the manual and filled it to the base of the fill cap gooseneck. It seemed good but tonight I added DEF and noticed my coolant level had dropped again. It seems to be about 3/4" below the gooseneck but I do not see any signs of leaking. I just returned from about a 1,000 mile trip towing my 5.5K lbs camper through mountains. Would towing in these conditions cause coolant to burn off?
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Re: Coolant Level Lower After Towing

Postby Walkers » Dec 29 2020, 12:09pm

In my experience, yes. My diesels were an LB7 and an LBZ. I believe that it was a head gasket issue. It happened every time I towed heavy loads. Daily driving did little to affect it. The other things that could be problems are radiator side tank leaks, look for dried coolant trails. Oil cooler, look for coolant in oil. Water pump, look for stain at weep hole on the bottom of the pump. Might need to use a mirror or phone camera to find that one.
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Re: Coolant Level Lower After Towing

Postby Pipsfc [OP] » Dec 29 2020, 3:47pm

I'll check all those locations. The issue i have is that this being a two year old truck with an L5P, I shouldn't be having this kind of problem "yet" (if it is indeed a problem).
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Re: Coolant Level Lower After Towing

Postby 19trax95 » Dec 29 2020, 4:03pm

It's under warranty yet obviously right?

But the reservoirs were known to crack and do pretty much exactly what you describe. More so on the previous generation (LML) motors though.

Also the heater core quick connects can leak, and the drip right onto the exhaust, so the coolant evaporates and you don't see a leak.

I'd start by pressure testing the system and see if you can see a leak or pressure loss.
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Re: Coolant Level Lower After Towing

Postby Pipsfc [OP] » Dec 29 2020, 4:32pm

It is under warranty still so I think I'll be giving them a call today.
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Re: Coolant Level Lower After Towing

Postby Old Barney » Dec 29 2020, 4:49pm

Those quick connects are a high failure part and should be sent to China as a gift. I have removed a few and connected the hose directly to the metal tube. Another time saving piece of junk the factory installs to get their stuff out the door. Let the next owner fool with it. The other place to look is the water pump. high intensity light and mirror or slide under and look for sign of leak on water pump behind the pully.
Good luck! I also replaced the dexcool with green antifreeze after flushing the system with clean water.
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Re: Coolant Level Lower After Towing

Postby Pipsfc [OP] » Dec 30 2020, 7:45pm

Since I'm still under warranty, I have an appointment to get the cooling system checked. I'll update what they find (if anything).
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Re: Coolant Level Lower After Towing

Postby Pipsfc [OP] » Jan 01 2021, 2:49am

So the dealership pressure tested the system and found no leaks. However, they said that when the block heater was installed, they think it was not done correctly by draining/bleeding/flushing (can't remember which it was) the system. They ended up refilling the coolant by vacuum and released a lot air. We'll see what happens...
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Re: Coolant Level Lower After Towing

Postby CT2500HD » Jan 01 2021, 4:08pm

Put UV dye in the coolant and go looking for the leak later when you lose some coolant.
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