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Troubleshooting coolant vacuum fill failure
I could be wrong (I'm not an experienced JLR mechanic) but from what I'm hearing in this thread as well as from the JLR mechanic I talked to, the tests that can be done to diagnose a head gasket breach, a cracked cylinder head, and/or any similar engine damage are pretty darn accurate, but a... -
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Troubleshooting coolant vacuum fill failure
@Land Rover Joe I think the loose lower radiator hose dumped coolant faster than the sensor could measure the temperature increase and so even though the engine was only on for about another 15 to 30 seconds after it went into limp mode, it was at operating temperature and then rose well above... -
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Troubleshooting coolant vacuum fill failure
Well folks, hate to say it but I found coolant in the oil pan. What a wild ride this has been, and a very sobering reminder that everyone makes mistakes. I’ve been wrenching on my vehicles for probably close to 20 years now. First ever engine I worked on was a 5VZFE in a 1998 Toyota T100. Had... -
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Troubleshooting coolant vacuum fill failure
Thanks @Land Rover Joe ! I work from home and we have another car so I have the luxury of time and space, it’s just whether I’ll want to take the time to do it, should evidence reflect positively on the engine’s well being after these next couple tests. I have a toddler who keeps my wife and I... -
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Troubleshooting coolant vacuum fill failure
Yup! In that first picture I’m oriented to what I’m seeing on the block — I see you have the oil cooler and lower half of the front coolant crossover pipe off. -
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Troubleshooting coolant vacuum fill failure
Oh and FWIW re: the engine temps, I did notice that my coolant temp never got over 210 on the 30 minute drive I took after I did the system overhaul but before that second drive on the highway that caused these problems. So if 230 is “normal” then the overhaul did a great job at lowering the... -
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Troubleshooting coolant vacuum fill failure
@Land Rover Joe and @jlglr4 do either of you know the level of effort required to get at the head gaskets? -
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Troubleshooting coolant vacuum fill failure
Thanks, folks. Good news is I serviced the supercharger when I had it off the engine during the cooling system overhaul. I replaced the coupler and the oil and the gasket between the supercharger and the intake manifold. The oil was kinda gross but even the guy who made the video I was following... -
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Troubleshooting coolant vacuum fill failure
I’m not sure what you mean by that. Either there’s coolant in places that it shouldn’t be, or there isn’t. -
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Troubleshooting coolant vacuum fill failure
I decided against getting the new expansion tank. Talked to an experienced mechanic at my local indy JLR shop and he recommended that I do 2 things: 1. Drain the oil and see if coolant comes out with it 2. Pull the spark plugs and use a borescope to look for coolant in the combustion chamber of... -
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Troubleshooting coolant vacuum fill failure
@Land Rover Joe thanks for the detailed set of questions / comments. I'm the 3rd owner (first two being a father and a son) and the LR4 has 86k miles on it. Oil changed about every 8k miles (higher than I'd have liked) at a local indy JLR shop, and since I bought the vehicle in January of this... -
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Troubleshooting coolant vacuum fill failure
I think before I do any of that, I’m gonna throw a Hail Mary here and see if the expansion tank isn’t the problem. It’s never been replaced, and it’s not wildly unlikely that a 10 year old piece of plastic exposed to countless heat cycles + the potential heat and pressure stress from last week’s... -
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Troubleshooting coolant vacuum fill failure
Today I got back under the car and connected the radiator hose properly but got another vacuum leak so I put in close to 8 liters of coolant and then hooked up the pressure tester, but this time I am struggling to generate even a few PSI of pressure. No external leaks that I can see either (and... -
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Troubleshooting coolant vacuum fill failure
Thanks for the kind words, @Land Rover Joe! From one internet stranger to another, I really do appreciate it. :) And I love LR Time! I haven’t seen this one, but it makes me feel better to know that even Christian makes mistakes. I’m taking some time away from the LR4 this weekend, but when I... -
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$56,000 2016 LR4 Landmark - Pricing typo or rising market?!?
Probably hoping some financially secure buyer stumbles in and doesn't know or care. ;) -
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Troubleshooting coolant vacuum fill failure
By the way, my GAP tool doesn’t show any engine faults registered. -
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Troubleshooting coolant vacuum fill failure
I am so sick of this car. I finally got the leak fixed and was able to confirm that the system could hold a vacuum, then I vacuum filled the coolant, and then confirmed that the system could hold pressure too. Then I turned on the car, turned the heat to max, idled until I felt heat, turned off... -
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Troubleshooting coolant vacuum fill failure
So I did the pressure test like y’all recommended and it turns out that the top half of the OEM front crossover pipe I got has a defective O ring! So I’m gonna return it and get another and hopefully that concludes my wild goose chase. Fingers crossed. -
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Cooling System/Crossover Pipe
I'd definitely avoid using ChatGPT as the only source of guidance. My company has an enterprise license and I would consider myself a power user of the various models (4o, o3, etc) and they are amazing at many things, but reasoning about complex automotive systems is not one of them (and if you... -
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Troubleshooting coolant vacuum fill failure
Well I took the whole damn thing apart this weekend. Checked the water pump (both O rings installed correctly), reseated the lower half of the front crossover pipe, and made sure the rear heater manifold was sitting right on the engine block and that the O rings weren’t pinched. Put it all back... -
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Troubleshooting coolant vacuum fill failure
Ah, thanks for the clarification! -
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Troubleshooting coolant vacuum fill failure
Side note, but has anybody ever used a mechanic’s stethoscope to find vacuum leaks by sound in hard to reach places? I tried it today to get at the junction between the lower front crossover and the engine block and didn’t seem to hear any appreciable difference between what that junction... -
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Troubleshooting coolant vacuum fill failure
Alright, so the air compressor is not the problem. It really is a vacuum leak in the system. I removed the expansion tank from the vehicle, put vacuum plugs in the outlets, and ran the vacuum on the expansion tank and it held -24ish inHg, so I’ve ruled that out as the cause. I also hooked it... -
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Troubleshooting coolant vacuum fill failure
Thanks for everyone’s advice so far. For these kinds of vacuum fills, do I need to be thinking about any other sources of leaks other than the rubber hoses or do I need to be considering things like the seals between the intake manifold and the engine block, the PCV valve, and the seal between... -
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Troubleshooting coolant vacuum fill failure
Hey folks. I’m at my wit’s end with the very last step in the comprehensive cooling system overhaul on my 2015 LR4 with 86k miles that I’ve been doing following txfromwi’s extremely helpful video on YouTube. My problem is that I can’t draw a vacuum greater than about -5 inHg. I’m using the...
