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Old 11-19-2019, 03:41 AM   #1
sfd656
 
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Question Stuck thermostat?

Hello our van (2014 NCV3 om651) seems to operate at fairly low temps about 80oC on on the stock dash guage (scanguage2 on the way). It warms the cabin fine but I would expect higher operating temps. Is it worth replacing the thermostat at this point or just keep running it?
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Old 11-19-2019, 05:51 AM   #2
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Default Re: Stuck thermostat?

Most likely your water pump has failed check if the water pump will hold vacuum with a vacuum hand pump
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Old 11-19-2019, 05:57 AM   #3
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Default Re: Stuck thermostat?

Sorry just noticed you said 80c that seems like a normal operating temperature to me
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Old 11-19-2019, 09:47 AM   #4
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Default Re: Stuck thermostat?

My Sprinter, a 2015 Roadtrek w/3-liter OM642, when fully warmed up, always settles out --plus/minus 2 degrees or so-- around 192F (89C) so maybe yours is a bit low....?
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Old 11-19-2019, 09:16 PM   #5
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Default Re: Stuck thermostat?

Quote:
Originally Posted by sfd656 View Post
Hello our van (2014 NCV3 om651) seems to operate at fairly low temps about 80oC on on the stock dash guage (scanguage2 on the way). It warms the cabin fine but I would expect higher operating temps. Is it worth replacing the thermostat at this point or just keep running it?
Others on this forum have reported that their OM651 engines run at about 175F, which is the same as you are reporting. Don't fix what seems to be operating properly.
The 6 cylinders operate at 195F and up.
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Old 11-20-2019, 05:22 PM   #6
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Default Re: Stuck thermostat?

Don't depend on dash gauges. To some degree they are dummy gauges and will show different temperatures.
Get ScanGauge to start with, as you can monitor soot % and regeneration status with it and it will tell you the temperature that ECU sees, not what dummy program wants you to see.
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Old 12-03-2019, 04:17 AM   #7
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Default P0128 after replacing thermostat

We recently just bought our van the previous owner had it at the dealer just before purchase for a thermostat replacement, due to CEL P0128, we do not drive often and have just over 100km of the van. I did have some concern that van was running at about 80 degrees Celsius but the fourm seemed to agree this was normal. Heater seems to work well. Coolant level is right between min and max when van is cold.

CEL came on Scanguage indicates P0128. Spoke with dealer they said that diagnostics would likely be about $250...eek. Will speak to manager as this seems to me to be part of an issue that was already ``diagnosed`` (previous owner did pay to have them service the vehicle).

I would appreciate guidance in the next diagnostic step.

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Old 12-03-2019, 09:55 AM   #8
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Default Re: P0128 after replacing thermostat

Year and engine???

And is this connected to your similar, cooling system related post last month?

https://sprinter-source.com/forum/sh...403#post825403

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Old 12-04-2019, 04:53 AM   #9
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Default Re: Stuck thermostat?

Definitely connected at this point... our old Delica used to run warmer (90-95 degrees Celsius) that was my original concern.

Spoke with previous owner about running temp and he said that it had always been around 80-90 on the dash, he also told me that in the week after we agreed to purchase the van but before we picked it up that he had a CEL and took it to the dealer for repair they replaced thermostat and coolant. They replaced the thermostat due to code P0128, he didn't have any issues aside from the CEL.

Scangauge and dash gauge match at between 82 to 89 degrees Celsius running temp. (normal)

I cleared the code this morning and we drove the van for approx 45 min to the ski hill up hill at avg 80km per hour and back home again after. No CEL.

Don't know if this is related but when we looked at the van I tested out the aux heater and the code apparently came up shortly after that, I also used the aux heater the day the code popped up for me. The aux heater seems to work well...
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