GLK 250 temp in the cold
01-07-2018 | 06:18 PM
#1
Thread Starter
Member
Joined: Jan 2007
Posts: 230
Likes: 19
GLK 250 temp in the cold
Hey Folks,
I have a GLK250 and now that it is below freezing, the engine temp never gets above 80C... Is my thermostat stuck open or is this normal for 20F degree weather?
Thanks,
Ed Cohen
I have a GLK250 and now that it is below freezing, the engine temp never gets above 80C... Is my thermostat stuck open or is this normal for 20F degree weather?
Thanks,
Ed Cohen
01-09-2018 | 07:32 AM
#4
Junior Member
Joined: Mar 2017
Posts: 38
Likes: 4
From: Toronto, Canada
2010 GLK350 4matic
Mine thermostat is stuck open, stays at around 60 during highway driving in the cold, and around 70 on city streets and driving up hill. Do you have a CEL? I had the P0128 code pop up.
01-09-2018 | 01:33 PM
#5
Thread Starter
Member
Joined: Jan 2007
Posts: 230
Likes: 19
I am not sure what is going on, I definitely have odd behavior... Today I drove from DC to NJ and the temp gauge went to the normal operating temperature within the first 15 minutes or so. It stayed there the entire trip, which was great. When it was 20 degrees colder, it never got close to 70c even after an hour of driving..
Is it possible that diesels do not generate enough heat to get to operating temperature below a certain temperature?
Is it possible that diesels do not generate enough heat to get to operating temperature below a certain temperature?
01-09-2018 | 11:37 PM
#6
Member
Joined: Nov 2014
Posts: 83
Likes: 3
GLK 250 Bluetec
I know some new small turbocharged diesels are so energyefficient, that they do not provide much heat for heatingsystem.
Like my sons VW Golf 1,9 Tdi. Common fix is to make a cover/shield in front of engine. To cover atleast part of cooling air entry area to engine area.
But never seen this on a GLK.
And actually I am shocked how quickly our GLK provides heat to cabin, when we start driving it. After driving only 2-3 kms from cold start at -5C weather I can already see the tempgauge needle moving a bit, and some warm air comes in through the vents. Not hot, but surely warm air.
The previously mentioned my sons Golf, takes atleast 3 times as long to give out any warm air to cabin. That is why we had to fabricate a cover for his vehicle. Black plastic piece, cut to size, fitted with zipties. But as I said, atleast on our GLK not needed.
I do not know if MB diesels have somekind of electric extra heater fitted to the system, to help it on cold mornings, to warm up the cabin so fast ?
A trip to dealer to ask , and maybe replace that thermostat ? It shouldn't be too expensive.
https://www.pelicanparts.com/catalog..._pg1.htm#item2
And some more info here :
http://www.mercedesmedic.com/mercede...heating-p0128/
After seeing that, I think our vehicle has the 87C thermostat, atleast that´s how it looks from the gauge.
Checking it at the dealer and replacing it is a piece of cake job for them.
D I Y job too, if one feels like it and has the place and tools.
Like my sons VW Golf 1,9 Tdi. Common fix is to make a cover/shield in front of engine. To cover atleast part of cooling air entry area to engine area.
But never seen this on a GLK.
And actually I am shocked how quickly our GLK provides heat to cabin, when we start driving it. After driving only 2-3 kms from cold start at -5C weather I can already see the tempgauge needle moving a bit, and some warm air comes in through the vents. Not hot, but surely warm air.
The previously mentioned my sons Golf, takes atleast 3 times as long to give out any warm air to cabin. That is why we had to fabricate a cover for his vehicle. Black plastic piece, cut to size, fitted with zipties. But as I said, atleast on our GLK not needed.
I do not know if MB diesels have somekind of electric extra heater fitted to the system, to help it on cold mornings, to warm up the cabin so fast ?
A trip to dealer to ask , and maybe replace that thermostat ? It shouldn't be too expensive.
https://www.pelicanparts.com/catalog..._pg1.htm#item2
And some more info here :
http://www.mercedesmedic.com/mercede...heating-p0128/
After seeing that, I think our vehicle has the 87C thermostat, atleast that´s how it looks from the gauge.
Checking it at the dealer and replacing it is a piece of cake job for them.
D I Y job too, if one feels like it and has the place and tools.
Last edited by eki912; 01-10-2018 at 03:53 AM. Reason: Adding info
01-10-2018 | 07:31 AM
#7
MBWorld Fanatic!
Joined: Sep 2015
Posts: 2,044
Likes: 236
2013 glk 350
If you let your vehicle run below design temp the oil never gets hot enough to cook out pollutants, you will quickly ruin your oil and sludge up your motor. If your running cold check to see a cooling fan is not running all the time , change your oil even if it only has a few thousand on it , block off cold air coming in and change your thermostat. I sludged up a Volvo by not fixing a sensor that kept the cooling fan running all winter. Your vehicle needs to reach operating temperature for at least 20 minutes to start to cook out pollutants in the oil. Short trips when it never warms up will ruin oil real fast.
