2008 C63 coolant smell in cabin when using heater
01-15-2019, 07:39 PM
#1
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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
01-15-2019, 08:41 PM
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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
01-15-2019, 08:42 PM
#4
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.
01-15-2019, 09:09 PM
#5
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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.
01-16-2019, 09:19 AM
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Heater core is dash-out for these cars. It’s a massive PITA.
01-16-2019, 01:20 PM
#7
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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01-17-2019, 04:00 PM
#8
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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?
02-23-2019, 04:28 AM
#9
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; 02-24-2019 at 05:52 AM.
