"Motor Coolant Over Temperature"

[Maxx]

To all the folks that have this issue, please share what version software you are running. My last update is not installing and I have been trying to force the update but if it is going to introduce this problem, I will back off.

Also, where you charging before you saw this message?

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[captpreble]

I just had this happen last night. The warning came on after the truck had been sitting for five hours on a cool, evening. There was no chance the coolant was actually hot. I drove it 1.5 miles home and parked it overnight. Warning is gone now.

 

[kbuicker]

No overheating, but the coolant level on my new Lightning was delivered from the factory at the minimum level. I had it topped off by the dealer during a visit for other warranty items.

Mine was too, very low indeed. Just filled it up and it's been fine ever since. I hope that's the worst thing I have to deal with

 

[TSR55]

I just had this happen last night. The warning came on after the truck had been sitting for five hours on a cool, evening. There was no chance the coolant was actually hot. I drove it 1.5 miles home and parked it overnight. Warning is gone now.

I just experienced the same thing. Truck had been sitting for several hours. Immediately on starting the motor coolant warning light came on and the reduced power indicator as well. I had just pulled onto the highway so I had to drive a few miles to get to safe spot. Turned the truck off for a few minutes then restarted with same result. Had to keep on driving a bit further and in that that time indicator gradually went from red to yellow to blue. Drove short distance this morning without recurrence, but makes me nervous. Coolant level is fine. Talked with my dealer and they have had no service updates from Ford regarding this problem but it seems from reading these posts that it is not uncommon? I have an appointment with dealer next week, but will have to keep driving in the meantime. (hope Ford is monitoring this thread)

 

[pjorg]

Just experienced the same issue with my 2023 Lariat ER. Truck has about 7,500 miles on it, was in the shop for 39 days early summer to have a battery module replaced under 23H01.

I got in this evening to drive to dinner. Truck lives in my garage, and in any case it’s been quite cool today (65°F or so). Absolutely no chance the coolant was warmer than ambient temps.

My story is identical to everyone else’s but for the record:

I started the truck, pulled out maybe 7 feet before I got the “motor coolant over temperature” dash alert. I also noticed before the alert that the truck sort of stuttered as I applied the accelerator. I shut truck off, waited 10 seconds, restarted, same alert.

Next I shut the truck off, got out and looked under the hood at the coolant reservoir. It’s well below the “min” line, as some others have reported. Checked under the truck and in the garage, no obvious signs of a coolant leak.

Got back in the truck, perhaps 2 minutes had passed. Truck now in yellow temp range. I put it back in the garage and we took a different car to dinner.

I will check when I get home to see if the warnings have resolved. At the very least I probably need to visit the dealer to have the low coolant checked out.

Someone mentioned a software update resolves this. I haven’t had an OTA update applied since early June, before my truck was in for a month for the module replacement. (I don’t have the SoC digits yet).

Maybe software will help, but how does a low coolant condition not result in a dash warning by itself?

 

[TaxmanHog]

Maybe software will help, but how does a low coolant condition not result in a dash warning by itself?

There is no level sensor on the truck.

 

[pjorg]

Update: upon returning home (perhaps two hours elapsed), I started the truck and all was normal. Temps were actually a tiny bit below dead center, which I don't believe I've ever seen before (though I don't pay close attention).

There is no level sensor on the truck.

Well. That explains it.

 

[TaxmanHog]

In earlier posts [20, 25 & 28] our trusted internal source mentions there is a data anomaly which causes this error, it will be fixed in a future update.

 

[pjorg]

In earlier posts [20, 25 & 28] our trusted internal source mentions there is a data anomaly which causes this error, it will be fixed in a future update.

I did read those but misinterpreted to understand that the fix was already available, but I simply hadn't received it OTA yet. Sounds like, in fact, it's not out yet.

Thanks for clarifying!

 

[MRButtler]

Same here this morning. Coolant over Min.

 

[2sleep]

So I'm wondering if the fluid is at the minimum mark when cold, does it expand to the top when it's hot?

 

[TaxmanHog]

So I'm wondering if the fluid is at the minimum mark when cold, does it expand to the top when it's hot?

No

 

[FlasherZ]

Thus one happened to me this morning but with a twist.

I drove 5 miles to the school bus yard and parked, then did my bus run (1 hour). When I returned to my truck and powered up, got the alerts, power reduced, limp mode, etc.

Figured it might be a sensor problem (pegged after sitting an hour? Doesn't seem right). Drove home in limpy mode, pulled into the garage.

Shut the truck off and powered back up, same alerts and notices. Heard some clicking noises. Powered down and back up again. Heard more clicking noises followed by the familiar start-up of the coolant pump, clicking went away.

I then watched as the red retreated to yellow, then retreated to the center of the range.

Based on the clicking noises during the first few times, then the temperature retreat when the coolant pump finally started, I took it to the dealer.

(Gotta deal with those monthly Active Air Dam System Fault messages anyway, along with the recalls...)

Will keep you posted.

 

[Mike G]

This just in....TSB 23-2316.

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