Empty coolant reservoir

[Nolander]

I happened to be poking around my 23 Lariat with ~23K miles this weekend and noticed mine is far below the MIN line. Stopping by the dealer today.

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[Rtashiro]

The coolant system has many spots for air to hang out. The pump will continue to purge the air into the bottle over several days of driving. You have 9 battery modules each with rubber connection hoses, all within the battery pack. If it leaks inside the pack, that is not good. Leaks outside the pack will show wet spots just a normal truck and can be addressed. The only open port is the bottle, and no overflow is intended by design so try to refill to the mid-point just incase you have refilled the system with that last dose.

I watched the Monroe tear down of the battery and inside the battery is a large cooling plate that the coolant runs through and the modules sit on top. The connections are on the outside of the battery casing. Thus hoses are not connected to the modules themselves and the coolant also doesn’t go into the battery modules themselves. Correct me if I’m wrong.

 

[SmoothJ]

When I had my battery module replaced, I had the same issue. I went to the dealer a few weeks later, and they added a little bit to the reservoir and its been stable since. As others have said, air will works it way though the system and it will eventually use the reservoir.

 

[Rtashiro]

After reading this thread I decided to check my level and it is sitting right at the min level in reservoir. This is with the truck cold after sitting over night. Is this a concern? What temp should you check level at? Truck is about 18 months old with 30000 km (19000 miles)

 

[TaxmanHog]

After reading this thread I decided to check my level and it is sitting right at the min level in reservoir. This is with the truck cold after sitting over night. Is this a concern? What temp should you check level at? Truck is about 18 months old with 30000 km (19000 miles)

No, early reports including my truck MY22 & many more observed it being at that level, I did increase mine closer to the upper limit, hasn't changed in 3+ years, I measured mine at ambient temp's

 

[Altivec]

Just a question to all you guys that experienced low battery coolant. Did you guys receive any warnings on the dash or the app? I mean, there are a million sensors in this truck, including windshield fluid. Please tell me they didn't cheap out by neglecting to put a low battery coolant sensor.

 

[DCAZEV]

Just a question to all you guys that experienced low battery coolant. Did you guys receive any warnings on the dash or the app? I mean, there are a million sensors in this truck, including windshield fluid. Please tell me they didn't cheap out by neglecting to put a low battery coolant sensor.

Nope, no warning at all. I happened to have the frunk open and I saw the reservoir tank and the "liquid" was below the "minimum" line. I immediately went to this forum to research what this was. After reading numerous threads on here, I figured out the issue. I purchased the truck used in September 2024. It's a 2023 Lariat E/R (Production date of 09/23). Not sure if it was the first time that it had gotten that low or not. I noticed this issue in June of this year (2025). I filled it up to the "max" line. I checked it again last week (August 2025) and it was still above the minimum line. I added a little bit more. Note: I live in AZ and right now the temps have been in excess of 110. I also use the truck for work, where I leave it "on" for 8 to 12 hours a day.

 

[MaintGrl]

Bought mine new and it was a bit low after a few months so got this to keep on hand.
https://www.amazon.com/dp/B00BNVK1NQ

Hum, so which is it . . Orange pre-diluted, or Yellow pre-diluted? Web page with a picture of one, and the description of the other...I don't know why Amazon has such a hard time with documentation

 

[TaxmanHog]

https://www.summitracing.com/parts/mof-vc13dlg

 

[jimfigler]

woe!! Love your optimism but that's not good. It's not normal to lose that much coolant. Hopefully you don't have a hole in one of your lines somewhere. I would have it checked out if I were you asap. I know you said its working fine but it only takes once to fry your batteries and end up on the side of the road with a huge battery bill to pay. Its way too late to say I have a problem then.

most early lightnings were delivered new with barely 1/2 inch of coolant in those tanks. many posted about it.

 

[PJnc284]

Guess Amazon is still using the old name (vc-13dil-b) which was apparently replaced by the vc-13-dl-g. The container I received and the notes later in the listing mentions the vc-13dl-g but Ford is a much better deal for half the price. Don't remember it being that cheap when I ordered it last year

Engine Coolant/Antifreeze - 50/50 1 Gallon Yellow Prediluted - VC13DLG | FordUS

 

[Altivec]

Nope, no warning at all. I happened to have the frunk open and I saw the reservoir tank and the "liquid" was below the "minimum" line. I immediately went to this forum to research what this was. After reading numerous threads on here, I figured out the issue. I purchased the truck used in September 2024. It's a 2023 Lariat E/R (Production date of 09/23). Not sure if it was the first time that it had gotten that low or not. I noticed this issue in June of this year (2025). I filled it up to the "max" line. I checked it again last week (August 2025) and it was still above the minimum line. I added a little bit more. Note: I live in AZ and right now the temps have been in excess of 110. I also use the truck for work, where I leave it "on" for 8 to 12 hours a day.

That is ridiculous. If there is one sensor that I care to have, it's the one that monitors the fluid that can destroy my truck if a rock hits a line or the rad or something. I didn't know checking the fluid level on this was something I needed to closely monitor. I get that the battery temp gauge would go up, but I doubt it would go up enough to notice unless on a long trip. A lot of wear and tare could be avoided with a simple fluid sensor. In winter time when the battery is supposed to be getting warmed, we probably wouldn't even notice it's not working by the temp gauge. Mine is always right in the centre even when it's really cold or really warm.

 

[Joe.....Montana]

I have a '23 Lariat purchase new in March of '24. After reading a thread on here (around June May '24) about low coolant levels I checked mine. Coolant level was just below MIN. Took it into local Ford dealership, they topped off for free, coolant line hasn't budged since. I now check about once a month or whenever I pop the frunk for groceries.

 

[DCAZEV]

That is ridiculous. If there is one sensor that I care to have, it's the one that monitors the fluid that can destroy my truck if a rock hits a line or the rad or something. I didn't know checking the fluid level on this was something I needed to closely monitor. I get that the battery temp gauge would go up, but I doubt it would go up enough to notice unless on a long trip. A lot of wear and tare could be avoided with a simple fluid sensor. In winter time when the battery is supposed to be getting warmed, we probably wouldn't even notice it's not working by the temp gauge. Mine is always right in the centre even when it's really cold or really warm.

Yes, mine has remained in the center for the most part, maybe slightly above on very warm days (in excess of 110) when I first turn the truck on. After driving for about 10 mins or so, it returns to dead center. **Side note: I always drive with either "Sport" or "Tow Haul" on.***

 

[PJnc284]

That is ridiculous. If there is one sensor that I care to have, it's the one that monitors the fluid that can destroy my truck if a rock hits a line or the rad or something. I didn't know checking the fluid level on this was something I needed to closely monitor. I get that the battery temp gauge would go up, but I doubt it would go up enough to notice unless on a long trip. A lot of wear and tare could be avoided with a simple fluid sensor. In winter time when the battery is supposed to be getting warmed, we probably wouldn't even notice it's not working by the temp gauge. Mine is always right in the centre even when it's really cold or really warm.

No different than having to check the antifreeze/coolant on an ice vehicle

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