omega_rugal Posted July 12, 2021 Share Posted July 12, 2021 2 hours ago, AZJeff said: Plain water boils at 212* Put a working 16lb pressure cap on the cooling system, and it raises the boiling point to 252* Add a 50/50 mix, and the boiling point is now 267* antifreeze is less efficient moving heat than plain water running pure antifreeze may help if you live in the artic but that s it Link to comment Share on other sites More sharing options...
CO MJ Posted July 12, 2021 Author Share Posted July 12, 2021 18 hours ago, cruiser54 said: Correct. Something is wrong and it has nothing to do with coolant concentration. It's pressure, circulation, or head gasket. It's a little grimey inside my stat orifice but water coming out clean. Pump doesn't look awful either. Going to go ahead and replace the pump anyways since I have the part. So I don't think the pump was the problem, so I now I'm thinking either head gasket leaking into the coolant passages, or possibly bad o2 sensor? Since I failed emissions with high CO I'm thinking maybe bad sensor causing me to run hot => high CO? I bought a kit to test the coolant for exhaust gasses as well, so will do that once I have everything back together. Link to comment Share on other sites More sharing options...
Pete M Posted July 12, 2021 Share Posted July 12, 2021 that should not be rusty inside. Link to comment Share on other sites More sharing options...
CO MJ Posted July 12, 2021 Author Share Posted July 12, 2021 39 minutes ago, Pete M said: that should not be rusty inside. So the picture doesn't do a whole lot of justice, it's not really rusty and more of a yellowish powerful substance that I'm guessing it's minerals deposited from water? It looks wayyyy better than some of the ones I've seen videos of, but any suggestions for cleaning her out really well? Maybe leave the stat out and fill it up with coolant cleaning stuff and water overnight? Link to comment Share on other sites More sharing options...
omega_rugal Posted July 12, 2021 Share Posted July 12, 2021 use pressurized water to clear the block from rust, rust blocks heat transfer more than you think Link to comment Share on other sites More sharing options...
JustEmptyEveryPocket Posted July 13, 2021 Share Posted July 13, 2021 Put some CLR in it and let it chooch. Kinda like THIS video. Link to comment Share on other sites More sharing options...
cruiser54 Posted July 13, 2021 Share Posted July 13, 2021 O2 sensor ain't gonna cause it to get hot. Use only Mopar thermostats. 83501426 AD. Link to comment Share on other sites More sharing options...
CO MJ Posted July 13, 2021 Author Share Posted July 13, 2021 13 hours ago, JustEmptyEveryPocket said: Put some CLR in it and let it chooch. Kinda like THIS video. Thanks! I flushed the block with oxalic acid yesterday and that seems to have gotten a lot of the build up. If I'm still hot after it's back together I'll try that route as well. 2 hours ago, cruiser54 said: O2 sensor ain't gonna cause it to get hot. Use only Mopar thermostats. 83501426 AD. Any reason to switch if the one I have is operating correctly? I'm going to look into a mopar temp sender as well Link to comment Share on other sites More sharing options...
cruiser54 Posted July 13, 2021 Share Posted July 13, 2021 The stat? Yes!! Change it. Link to comment Share on other sites More sharing options...
Pete M Posted July 13, 2021 Share Posted July 13, 2021 when it comes to thermostats: when in doubt, change it out. on most cars they are cheap and easy to do. although when it comes to the Liberty diesels, it's a super expensive part and not at all easy to get to. Link to comment Share on other sites More sharing options...
CO MJ Posted July 13, 2021 Author Share Posted July 13, 2021 3 hours ago, cruiser54 said: The stat? Yes!! Change it. Sorry, it's buried in the OP but I do have a brand new stat. I boiled the old and the new and they were both opening correctly but I put the new one in, all good! Link to comment Share on other sites More sharing options...
cruiser54 Posted July 13, 2021 Share Posted July 13, 2021 Okay. Good Link to comment Share on other sites More sharing options...
watchamakalit Posted July 13, 2021 Share Posted July 13, 2021 14 minutes ago, CO MJ said: Sorry, it's buried in the OP but I do have a brand new stat. I boiled the old and the new and they were both opening correctly but I put the new one in, all good! What temp is the thermostat? Link to comment Share on other sites More sharing options...
CO MJ Posted July 14, 2021 Author Share Posted July 14, 2021 2 hours ago, watchamakalit said: What temp is the thermostat? 195 Link to comment Share on other sites More sharing options...
CO MJ Posted July 14, 2021 Author Share Posted July 14, 2021 Ok, new water pump wasn't the answer. Still up to 260 after just idling for a few minutes. I'm gonna pick up a new stat gasket as well as another new stat and retest them all this afternoon. @cruiser54 for the exhaust gas test, do you know about how much driving I'd need to do for the test to actually pick up the gasses in the coolant? Link to comment Share on other sites More sharing options...
cruiser54 Posted July 14, 2021 Share Posted July 14, 2021 14 minutes ago, CO MJ said: Ok, new water pump wasn't the answer. Still up to 260 after just idling for a few minutes. I'm gonna pick up a new stat gasket as well as another new stat and retest them all this afternoon. @cruiser54 for the exhaust gas test, do you know about how much driving I'd need to do for the test to actually pick up the gasses in the coolant? Idling in the driveway. Link to comment Share on other sites More sharing options...
Pete M Posted July 14, 2021 Share Posted July 14, 2021 did you bleed the air pocket out of the temp sensor? Link to comment Share on other sites More sharing options...
CO MJ Posted July 14, 2021 Author Share Posted July 14, 2021 16 minutes ago, Pete M said: did you bleed the air pocket out of the temp sensor? Yeah, I have pulled the sender from the block every time I've refilled. Here's another question while I have the stat out. How far should it actually open when boiled? I've never done this before, but from watching a few videos I feel like maybe my stat isn't opening far enough. The little cylinder inside the stat retracts maybe 4-5mm and I can see 1-2mm all the way around for water to flow, while most of the videos look more like 5-6mm or so, but I also don't see any videos with a similar style stat. My local place doesn't have the mopar stat but I have one on order, may just put this on hold until it arrives Link to comment Share on other sites More sharing options...
fiatslug87 Posted July 14, 2021 Share Posted July 14, 2021 While you wait try running it without the t-stat to see if you run cool. Link to comment Share on other sites More sharing options...
omega_rugal Posted July 14, 2021 Share Posted July 14, 2021 remove the thermostat, also see if the radiator is as hot as the engine and if the hoses hold pressure Link to comment Share on other sites More sharing options...
CO MJ Posted July 14, 2021 Author Share Posted July 14, 2021 Well I guess that's all she wrote. Looks like it's head gasket time. I suppose I should send the head off to be checked for cracks or just buy a refinished head? Removing the stat did keep it cool but I guess this needs to be addressed Link to comment Share on other sites More sharing options...
cruiser54 Posted July 14, 2021 Share Posted July 14, 2021 cool test, huh? Link to comment Share on other sites More sharing options...
Pete M Posted July 14, 2021 Share Posted July 14, 2021 headgasket failures are far more common than cracks, but I guess there's no real way to know without pulling things apart. Link to comment Share on other sites More sharing options...
omega_rugal Posted July 15, 2021 Share Posted July 15, 2021 you didnt notice the bubles coming out the radiator? even with out a test yo could just watch for bubbles in the radiator cap Link to comment Share on other sites More sharing options...
CO MJ Posted July 15, 2021 Author Share Posted July 15, 2021 20 hours ago, omega_rugal said: you didnt notice the bubles coming out the radiator? even with out a test yo could just watch for bubbles in the radiator cap It must be a very small leak, there are almost no bubbles and what there was I assumed was just burping Link to comment Share on other sites More sharing options...
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