2010 GLK 350 4Matic very very slow to heat up in winter.
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Junior Member
Joined: Apr 2011
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2010 GLK
2010 GLK 350 4Matic very very slow to heat up in winter.
Hey folks,
I have a 2010 GLK 350 4Matic. The colder it is, the longer it takes to heat up to temp. (Makes sense) However, I have a remote start and to get it to even produce luke warm air, I have to let it cycle through at least once. Twice on really cold days. I leave the fan on half speed when it's running. At highway speed for more than 15 minutes I can finally get the heat to pump out nice and warm/hot and heat the entire cabin to a comfortable temp, but if I am ripping around the city it will take about 30 minutes before I feel comfortable on some days. I am from Canada so it can definitely get cold here, but I have never owned a vehicle that performs so poorly heat-wise in the winter.
It seems to me like it is getting progressively worse over the years, all be it, it was never that great to begin with. Could be my imagination. I had the low coolant light come on a few months ago, and took it into my dealer. They topped it up for me and sent me on my way. No real issues that I have noticed that could be causing this.
Any other owners experiencing this? Is this a design flaw? Any info would be greatly appreciated. I will be checking this thread periodically, so if you need more info I can provide it.
Thanks!
I have a 2010 GLK 350 4Matic. The colder it is, the longer it takes to heat up to temp. (Makes sense) However, I have a remote start and to get it to even produce luke warm air, I have to let it cycle through at least once. Twice on really cold days. I leave the fan on half speed when it's running. At highway speed for more than 15 minutes I can finally get the heat to pump out nice and warm/hot and heat the entire cabin to a comfortable temp, but if I am ripping around the city it will take about 30 minutes before I feel comfortable on some days. I am from Canada so it can definitely get cold here, but I have never owned a vehicle that performs so poorly heat-wise in the winter.
It seems to me like it is getting progressively worse over the years, all be it, it was never that great to begin with. Could be my imagination. I had the low coolant light come on a few months ago, and took it into my dealer. They topped it up for me and sent me on my way. No real issues that I have noticed that could be causing this.
Any other owners experiencing this? Is this a design flaw? Any info would be greatly appreciated. I will be checking this thread periodically, so if you need more info I can provide it.
Thanks!
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 15
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2010 GLK
The colder the temp the colder the engine temp which makes sense, but it seems to run around 60 - 70 depending on the temp in winter. It will eventually reach the 80 mark after driving for quite a while but really won't get above that. Anything around or above 80 is when the heat will start to pump out fairly warm and make the cabin air heat up. Engine runs at a decent temp (above 80) when the weather is above freezing.
Can't remember when the cabin air filter was changed last but it has been replaced. I should do that again but I don't think that is the cause of the problem as the air flow seems fine. The problem is the air temp.
Last edited by kerrly; Feb 27, 2015 at 11:25 AM.
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Joined: Feb 2009
Posts: 6
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From: Ottawa, On
GLK 350 NO LOGIC 7, NO KEYLESS GO
I had exactly the same problem. The engine temperature never passed 80C for 2-3 weeks, then the engine light was on. Replaced the thermostat, everything's back to normal.
Here's how to replace the thermostat.
This is the thermostat.
Here is how to drain the coolant.
https://mbworld.org/forums/glk-class...tructions.html
Here's how to replace the thermostat.
This is the thermostat.
Here is how to drain the coolant.
https://mbworld.org/forums/glk-class...tructions.html
MBWorld Fanatic!
Joined: Jan 2009
Posts: 2,780
Likes: 115
From: Northern NJ
GLK 350 / Porsche 993
def not normal...in city i have hot air after 7-10 min drive, when it's low teens (F). I don't idle the car. I just get in and go (just take it easy while it's warming up).
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Senior Member
Joined: Jul 2014
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From: South East US.
2015 GLK350
That was a good video except the part where he lets the old coolant dump all over the front of the engine and engine bay. It should have been properly drained before he started.
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Joined: Aug 2011
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From: Philly area
350 GLK, C280
Be advised that an idling engine does not produce much heat. Only when you need to pull some power does it start to heat up, so if you start the car and don't drive it all you are doing is washing the oil off the rings and putting unburned gas into the catalytic's. since the engine needs to run rich when cold. You need to start the car, wait a second or two for the oil to fully circulate and then drive away.
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2013 Infiniti G37 Coupe; 2011 GLK 350 w/ Premium 1, Multimedia & Sport Appearance; I LOVE IT!
Senior Member
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From: South East US.
2015 GLK350
Yes, I caught that too. It probably didn't hurt the wrench, but it's still the wrong tool for the job. It bothers me more that he thinks it is ok to make a mess of a car when the engineers provided a clean and convenient method for draining the coolant.
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GLK 350
GLK 350 2010 very slow to beat up thermostat has been changed
So as the title says my GLK can run for 15 minutes and only blow luke warm heat. The thermostat has been changed and that did not correct the issue. While driving the heat is incredible it’s only an issue during warm up is this normal?
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GLK 350
Newbie
Joined: Nov 2019
Posts: 4
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GLK 350
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