Well, as the title states.... my engine coolant is just disappearing. It have been watching, and I don't see any leaks. I park in my garage every day, and the same spot at work every day. I have not found any leaks. But about a month or two ago, my coolant in the reservoir was low, so I topped it off with the correct coolant (Zerex G-05 HOAT)
Well, as of this morning, the reservoir was bone dry. However, I opened the radiator cap and the fluid was full to the top there. But just nothing left in the reservoir at all. From just about a month and a half of driving.
So with that said, im gonna rewind a couple months here. Before I topped off my fluid I had no leaks, and the coolant wasn't disappearing. It was just a little low in the reservoir. It had been like that for almost a year, but it wasn't disappearing. I just topped it off because were were hitting the road for our memorial day offroad trip.
Here is what worries me the most....... I overheated my engine on this trip. pretty badly too. The trip was going great, tons of great trails and times had with my dad, my brother and I. (two JK's and me in the WK). We went to a sand hill climb area, which is where it all happened. I should have been able to make it up the hill no problem. Plenty of power and low end from the hemi, should have pushed me up the hill easier than even my brother. (JK with 35" powered only by the v6) But human error and my ESP screwed me all up.
I attempted to climb the hill, but I forgot to turn my ESP off. It was going strong until about half way up my esp kicked in and cut the engine power and sunk me. So a little embarrassed, I reversed back down, put it in 4 low and tried it again. The hill is pretty steep and at the very top it crests over, you think your up the hill but after that crest, its still a decent incline for about another 100ft or so. Well thats where I messed up, I cruised right up the hill with no problems. Right after I crested the top I stopped to take it out of 4-low. (not taking in account that I was still on an incline in the sand) Everyone started yelling "Why did you stop!?" That's when I realized I screwed up and should have waited until I was completely out. I was stuck again.
Instead of reversing back down, I tried to climb out. I put it in reverse then forward and reverse then forward. I wasn't slamming on the gas or anything, but I was applying steady throttle and I was slowly climbing out, when I looked down and saw that my engine temp was almost maxed out. (it was about 90 degrees out, in the sand and a black jeep) So I immediately stopped and had my brother come winch me out. But it was too late. It was dangerously hot. No smoke or knocking or anything bad like that, but when I opened the hood, the coolant in my reservoir was BOILING.
It boiled for a while, probably 15-20 minutes. The whole reservoir actually started to swell up a little. I do have a video on my phone that I will upload of it boiling. I let it cool down for a few hours. After that I started her up and she runs fine. My dad and brother actually talked me into climbing the hill again, and I did like 3 more times with no problems. This time making sure not to stop lol. That whole time the temp never even got to the half way point. (my normal running temp)
She drove fine the rest of the trip, and I drove her 4 hours back home on the freeway, with no problems. And I was getting 20.1 mpg with MDS working perfectly. Everything seems normal. But my coolant, it just disappeared. Im really worried that I might have warped a head and am possibly burning the coolant. What are the chances for that to happen?
Again, I really see no leaks. I had a few small drips right under the radiator cap, but I wiped them up, and haven't seen any more. So I don't understand where its going. Unless my fear is coming true, and im burning it off.
I just topped it back off today, and im going to continue to closely monitor it and the levels. Is there something else I should be looking for?