Usally the search bar works decent. Not sure if im spelling the title wrong or what have you. Its the truck stop diagnosis. Thread. What I'm going to add is how to narrow down a anti freeze leak.
@Chinatown . I must uave titled it different than what I remember. I went three pages back and didn't see it. I think I'm going to start one called. Help me fix this. @NYStarcar I'm not sure where its going. I've looked all over the engine. It's not in the oil which I know is a plus. But I'm losing about 3/4th gallon every 8 or 9 days. Some one suggested looking at the engine at night with a flash light. But I'm not sure how that would help.
Do u have a cummins? How many miles on the engine? If no visible leaks, and not in the oil. If you have a cummins they a notorious for egr coolers going bad and drinking the coolant around 500k miles or so. Thats quite a bit of coolant to be using but no leaks. Its burning off somewhere.
Did it end up in your Fuel water separator? I had this happen earlier this year but it drank the coolant.
Check your transmission fluid level, if it pours out from the side fill plug, you have your answer, it will be the “Transmission Cooler”. I was losing coolant also, I had all the signs, I was pushing gear oil thru the breather first, I extended the breather with a hose, after a week or so, I started leaking gear oil thru the front input shaft(seal). I finally told the shop to drain all the transmission fluid and bypass the transmission cooler. My problem was solved. No more coolant loss.