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Old 09-14-2021, 02:49 PM   #1
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Sprinter engine temperature

I have a 2019 Sprinter on a 2017 chassis with the 3.0 Diesel.

Recently, on a trip to Yellowstone, the engine temperature rose to 250 degrees. We took it to the closest Sprinter service facility (200+ miles away) by driving at night. They found the fan clutch was not engaging properly and replaced it. They also said the thermostat was stuck closed, but did not have it in stock. I found it hard to believe that we were able to drive it 200 miles with the thermostat stuck and did not have time to wait a week for them to ship it in, so I ignored that suggestion and we drove it without any problems for the rest of our trip (18 days). It did reach temps of 220-230 at times in hot weather pulling a jeep and climbing mountains, but never approached 250 as it had before.

My question for my fellow sprinter owners is what temperature does yours run at most of the time? What is the highest temp you have seem in hot weather under heavy loads? I'm used to gas vehicles that stay under 200, but maybe this diesel with DEF is designed to run hotter? Thanks!!
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Old 09-14-2021, 03:04 PM   #2
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I don't actually know for sure what the engine temp has been in mine on a hot day, but I don't remember it being more than 200F on that crude little scale. The manual says 250F is not out of the normal range. Sounds pretty high to me, though.

As to the thermostat, it may be stuck in a partially open position. I've had that happen on outboards. I don't think you'd be driving at highway speeds for long with the thermostat completely closed.
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Old 09-14-2021, 03:23 PM   #3
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Quote:
Originally Posted by Jay in TX View Post
I have a 2019 Sprinter on a 2017 chassis with the 3.0 Diesel.

Recently, on a trip to Yellowstone, the engine temperature rose to 250 degrees. We took it to the closest Sprinter service facility (200+ miles away) by driving at night. They found the fan clutch was not engaging properly and replaced it. They also said the thermostat was stuck closed, but did not have it in stock. I found it hard to believe that we were able to drive it 200 miles with the thermostat stuck and did not have time to wait a week for them to ship it in, so I ignored that suggestion and we drove it without any problems for the rest of our trip (18 days). It did reach temps of 220-230 at times in hot weather pulling a jeep and climbing mountains, but never approached 250 as it had before.

My question for my fellow sprinter owners is what temperature does yours run at most of the time? What is the highest temp you have seem in hot weather under heavy loads? I'm used to gas vehicles that stay under 200, but maybe this diesel with DEF is designed to run hotter? Thanks!!
Do you mean the engine coolant temperature hit 250F? It's the only MB temperature that can be displayed by using the dash display, that I'm aware of.
My fluid temps (per my SGII) are, coolant 197-202F, oil temp 215F, and transmission fluid maybe 165F in 72F ambient temps, under no signififcant load. Throw in 90F+ ambient, and hill climbs, while towing, and they go up more than a bit.
I'm wondering if you caught your van/motorhome doing a DPF regen, while running it in hotter weather? That pushes my oil temps to around 240-250F for the duration, and the coolant and trans fluid climb as well, sometimes to over 212F until the regen ends, and the temps return to pre-regen numbers.
Had you just started out in the morning after some days of lower speed driving, or had you been driving it regularly during your YNP visit at lower speeds than 50mph, or extended idling while looking around the park? I think the speed limit on 89 in YNP is 50mph or lower?
I might buy the partially open thermostat theory. Possible, but then you drove it as normal for the rest of your trip?
I used to see my Chevy Vortec 350 V8 hit some pretty scary temps a few years back, in the same range as what you're seeing in hot weather under load, and it wasn't really considered harmful or dangerous according to the dealer.
If it gets up there and stays, then start to investigate further. And don't just stop and turn it off. The manual says pull over and let the engine idle for a while, to let the water pump and fan do their thing.
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Old 09-14-2021, 03:48 PM   #4
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I used to see my Chevy Vortec 350 V8 hit some pretty scary temps a few years back, in the same range as what you're seeing in hot weather under load, and it wasn't really considered harmful or dangerous according to the dealer.
My Jeep Grand Cherokee with V6 EcoDiesel got up to about 250F once, on a very long upgrade towing a boat trailer using cruise control in hot weather. No alarms or warnings, but I backed off a bit and manually forced it down a gear or two to get engine speed up a bit. Trans temp was right up there, too. Not something I'm used to seeing, that's for sure, but it would seem the manufacturer didn't think it was cause for alarm.
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Old 09-14-2021, 04:00 PM   #5
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Once while towing with my MB 3.0 diesel (same as Sprinter engine) in very hot weather (100 F +) up a long hill my coolant temperature reached 250 F. At that point my engine derated and I could only go 40 mph max stuck in the slow lane with the semis. After passing the summit the engine cooled down and the computer released the engine to normal operation.

Diesels run hotter than gassers because of their higher compression ratios. Up to 250F is normal.
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Old 09-14-2021, 08:29 PM   #6
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Originally Posted by KanzKran View Post
I don't actually know for sure what the engine temp has been in mine on a hot day, but I don't remember it being more than 200F on that crude little scale. The manual says 250F is not out of the normal range. Sounds pretty high to me, though.

As to the thermostat, it may be stuck in a partially open position. I've had that happen on outboards. I don't think you'd be driving at highway speeds for long with the thermostat completely closed.

The manual sounds like 250 is ok, but at that point the gauge starts flashing red and the display says to pull over and stop the engine.

As for the thermostat, I thought the same thing that there was no way I could have driven this RV all over the country if the thermostat was stuck closed as the tech advised. The dealership was in Midland, Tx and we drove it all the way to Yellowstone and then back to Texas. I do think it could be possible that the thermostat could be stuck partially open?
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Old 09-14-2021, 11:58 PM   #7
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We're nearing the end of a over 3 month roadtrip now, over 12,000 miles. The highest coolant temperature observed on the Scan Guage was 228 degrees. This was in the Southwest with ambient temperature about 105 degrees, 5,000 ft altitude. Coolant would back down to about 210 degrees on level roads & 60 mph.
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Old Yesterday, 05:04 AM   #8
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Originally Posted by Rocky ARV View Post
We're nearing the end of a over 3 month roadtrip now, over 12,000 miles. The highest coolant temperature observed on the Scan Guage was 228 degrees. This was in the Southwest with ambient temperature about 105 degrees, 5,000 ft altitude. Coolant would back down to about 210 degrees on level roads & 60 mph.
Your coolant temps sound pretty similar to mine currently.
Thanks for our feedback!
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Old Yesterday, 06:16 AM   #9
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I do think it could be possible that the thermostat could be stuck partially open?
It certainly could be. When my Honda OB didn't seem to warm up in the driveway like it normally did (using ear muffs for cooling water), no matter how long I ran it under no-load conditions, I pulled the thermostat and it was stuck in about the middle of its range. I put it in boiling water and it didn't move, and it certainly didn't close once cooled.

Obviously, nobody can say for sure what's going on with yours, but I've seen them get stuck (cars included) somewhere between open and closed, so it's possible yours is doing the same thing.

I would probably change it, as it's cheap insurance. I have no idea if it's a DIY project, though, as I'm still new to this van and its systems. But from the picture of the housing, it doesn't look any more involved than any other small thermostat, assuming it's not hard to get to.

https://www.stockwiseauto.com/dorman...waAmLAEALw_wcB
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