Classy Comanche Posted August 14, 2022 Share Posted August 14, 2022 Okay so I have swapped over to the Mac tank and had a overflow tank installed as well, the square plastic one. So I have come into a "problem" maybe not one at all, maybe just me not knowing, but my question is: Can this plastic overflow tank stay empty. So none of these pictures are as of recent. These were taken seven weeks back. I seem to lose coolant out of this tank when I park it. It normally spits it back up as I drive and it heat back up. But then after it sets for 4 hours or more the coolant inside the small plastic tank begins to drop below the "cool" mark on it. And as I drive more and more it gets lower and lower. I'm not leaking it onto the floor. No blown gasket. Anything I need to check or have checked? It just seemingly disappears and is spit back up when I drive. What I'm scared of is running it with this smaller tank empty and it suck air into the cooling system messing something up. Again I'm just being cautious because I've scratched my head for a bit about this. Engine cools so much better since this installation. Just curious on what's going on here Link to comment Share on other sites More sharing options...
cruiser54 Posted August 14, 2022 Share Posted August 14, 2022 Fill the tank up to half way between cold and hot with the engine colt and monitor it. Link to comment Share on other sites More sharing options...
Classy Comanche Posted August 14, 2022 Author Share Posted August 14, 2022 Can do! I'm taking it to the shop for a super thorough look over at my seals and valves is one stuck open [if it has any.] But yeah. It's just strange. It drops lower than what I had originally and spits it eight back up while hot. Kinda makes me wonder if it's sitting in my radiator Link to comment Share on other sites More sharing options...
cruiser54 Posted August 14, 2022 Share Posted August 14, 2022 Not strange at all. It's a universal reservoir. The manufacturer has no ironclad idea where the level should be. The markings on it are a SWAG. What's wrong with our valves now? Link to comment Share on other sites More sharing options...
Classy Comanche Posted August 14, 2022 Author Share Posted August 14, 2022 Oh I didn't know if a valve was stuck open where it controls my coolant flow, and I'll do halfway and see what it does, also what does SWAG mean? I know I went from a closed to open system so yeah the jeep manufacturer truly has no clue where the level should be albeit this should work Link to comment Share on other sites More sharing options...
cruiser54 Posted August 14, 2022 Share Posted August 14, 2022 Your radiator cap controls the flow. Sophisticated Wild @$$ Guess. Link to comment Share on other sites More sharing options...
Classy Comanche Posted August 14, 2022 Author Share Posted August 14, 2022 Yeah, actually your right. Rad cap is the one where controls it. 16lbs it says. But yeah I'll fill it and keep an eye on it. All runs good. Just need to get this small thing figured out for good is all, thanks!! Link to comment Share on other sites More sharing options...
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