2008 C63 coolant smell in cabin when using heater
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Newbie
Joined: Jan 2019
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c63 sedan
2008 C63 coolant smell in cabin when using heater
picked up a 2008 C63, I freakin love it
strange issue, get a strong coolant smell in the cabin when using heater, last about 5 min then seems to clear up
if you put the thermostat at full cool with a/c on doesn't do it
but if either driver or passenger thermostat adjust any above the coolest temp setting coolant smell comes thru the vents
recirc/fresh/ac on or off doesn't matter, get no coolant smell or coolant loss outside car, just thru interior vents, expansion tank stays full
is this a known issue? suspects would be evaporator or heater core? is there some clamps or something I can check or internal core issue ?
I assume either is dash out
strange issue, get a strong coolant smell in the cabin when using heater, last about 5 min then seems to clear up
if you put the thermostat at full cool with a/c on doesn't do it
but if either driver or passenger thermostat adjust any above the coolest temp setting coolant smell comes thru the vents
recirc/fresh/ac on or off doesn't matter, get no coolant smell or coolant loss outside car, just thru interior vents, expansion tank stays full
is this a known issue? suspects would be evaporator or heater core? is there some clamps or something I can check or internal core issue ?
I assume either is dash out
Thread Starter
Newbie
Joined: Jan 2019
Posts: 9
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c63 sedan
poked around all under the carpets on firewall, all dry
watched hoses on both sides going thru firewall all dry
I assume when any heat is requested there is a valve that allows coolant to circuate thru the heater core, just cant find any leaks
has to be leaking internally or something but the level never comes up low, coolant is full and looks good
the smell is heavy coolant smell thru all vents, is dissipates but is noticeable
watched hoses on both sides going thru firewall all dry
I assume when any heat is requested there is a valve that allows coolant to circuate thru the heater core, just cant find any leaks
has to be leaking internally or something but the level never comes up low, coolant is full and looks good
the smell is heavy coolant smell thru all vents, is dissipates but is noticeable
Member
Joined: Nov 2018
Posts: 115
Likes: 47
2012 C63 w204 sedan
Have had coolant smell on 2 cars in my family over the years, both times was heater core failures.
One was left long enough that vapor began to be emitted and fogged the windscreen.
The bad news is on both cars it seemed as though the heater core was hung from a string in the factory then the entire car was assembled around it. By this i mean it took me hours of dash disassembly to get to.
One was left long enough that vapor began to be emitted and fogged the windscreen.
The bad news is on both cars it seemed as though the heater core was hung from a string in the factory then the entire car was assembled around it. By this i mean it took me hours of dash disassembly to get to.
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,175
Likes: 130
From: NY
2010 C63 2019 GLA45
Some cars are designed with access to the heather core through the firewall from the engine side.
I'm not sure about these.
I think one of my old Mercedes had this type of initial leak and I did nothing about it and it didn't get worse.
I'm not sure about these.
I think one of my old Mercedes had this type of initial leak and I did nothing about it and it didn't get worse.
Member
Joined: Dec 2018
Posts: 79
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2011 C63 AMG
Aren't the 2008 to mid 2011 prone to the headbolt issue where the coolant can get seep into the engine. These cars are prone to burning a bit of oil in between oil changes, which is very normal, is there a chance that it's burning oil and coolant and that smell is transmitted thru the vents?
Senior Member
Joined: Feb 2018
Posts: 339
Likes: 108
From: Virginia USA
2016 GTs, 2014 C63 AMG and 2014 C350 Sport (wife's car, she thinks it's an AMG - shhhhhh)
Aren't the 2008 to mid 2011 prone to the headbolt issue where the coolant can get seep into the engine. These cars are prone to burning a bit of oil in between oil changes, which is very normal, is there a chance that it's burning oil and coolant and that smell is transmitted thru the vents?
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Joined: Feb 2019
Posts: 18
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W203 M271 2004 C200
Having exactly the same issue with my C200 2004 with all windows become foggy after 10 minutes leading to sever degradation in the viability. I had to top up the coolant with 1/4 L every month.
However, I did read a lot about radiator stop leak products and 3 weeks ago I fixed this issue by purring only half of 125 ml of Liqi Moluy radiator stop leak in the expansion tank and the problem is complacently disappeared now. Just make sure to follow the instruction and not to leave the engine set off for long hours during first couple of days just to prevent the thermostat from being contaminated by the additive.
By the way, I still smell slight coolant smell from the vents which I believe is only residual and it will disappear by the time.
However, I did read a lot about radiator stop leak products and 3 weeks ago I fixed this issue by purring only half of 125 ml of Liqi Moluy radiator stop leak in the expansion tank and the problem is complacently disappeared now. Just make sure to follow the instruction and not to leave the engine set off for long hours during first couple of days just to prevent the thermostat from being contaminated by the additive.
By the way, I still smell slight coolant smell from the vents which I believe is only residual and it will disappear by the time.
Last edited by Alaqil; Feb 24, 2019 at 05:52 AM.
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