Coolant Disappearing

I had my truck in the shop last week , because my low coolent level warning came on..since then I still have the same problem. I still have to add coolent on a daily basis, even though the shop cleared me. I don’t see any fluid on the ground when I do a pre/post trip inspection. Where is the coolent going? Any ideas until I get back to the shop?

No idea, but I had the problem in a 2020 Peterbilt I was assigned a few months ago. I had to add coolant daily, no leaks and the shop didn't find anything wrong.

I now have a 2016 KW and the coolant level is at the max line every night.

The world may never know.

Any on the inside of the hood?

I had my truck in the shop last week , because my low coolent level warning came on..since then I still have the same problem. I still have to add coolent on a daily basis, even though the shop cleared me. I don’t see any fluid on the ground when I do a pre/post trip inspection. Where is the coolent going? Any ideas until I get back to the shop?

Possible head gasket leak. Coolant is likely burning off with the combustion gasses. Just a guess.

Could be the above responses and ideas, but I will bet it is going to be a high pressure leak. This won't show any puddles after parking. Ask the shop to do a pressure test on the coolant system and that leak will reveal itself.

Any on the inside of the hood?

I had my truck in the shop last week , because my low coolent level warning came on..since then I still have the same problem. I still have to add coolent on a daily basis, even though the shop cleared me. I don’t see any fluid on the ground when I do a pre/post trip inspection. Where is the coolent going? Any ideas until I get back to the shop?

Good suggestion, Klutch. I will keep an eye out for that because I haven’t thought of that. Thanks.

Happened to me with my last truck, felt like an idiot. I couldn’t see any leaks anywhere but the inside of my hood was covered… which the mechanic was quick to point out.

Any on the inside of the hood?

I had my truck in the shop last week , because my low coolent level warning came on..since then I still have the same problem. I still have to add coolent on a daily basis, even though the shop cleared me. I don’t see any fluid on the ground when I do a pre/post trip inspection. Where is the coolent going? Any ideas until I get back to the shop?

Good suggestion, Klutch. I will keep an eye out for that because I haven’t thought of that. Thanks.

These little gnomes take it everytime you irritate someone here on TT. Just dont lose any miles over this one please.

I was going to say head gasket issue also. Happened in my 2015 cascadia. Mechanics didn't know until it finally blew. Then they were like "how did u even drive this in?" 😂

Little did they know the truck was afraid of me.

I was going to say head gasket issue also. Happened in my 2015 cascadia. Mechanics didn't know until it finally blew. Then they were like "how did u even drive this in?" 😂

Little did they know the truck was afraid of me.

Now THAT’S the humor that’s been missing. 🤣