My CLK55 keeps overheating!!
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 18
Likes: 0
From: Los Angeles,CA
01 CLK55, 04 CLK320, 03 E500, 16 BMW 320i
My CLK55 keeps overheating!!
So, recently my 2001 CLK55 AMG (w208) has been continuously overheating!
After replacing the water pump with a brand new unit i took it for another drive...only for it to overheat and spill coolant everywhere! I'm not sure if it being around 100 degrees outside affected it...but what else could be the problem?
The car has about 165k miles if that might play a factor in it.
After replacing the water pump with a brand new unit i took it for another drive...only for it to overheat and spill coolant everywhere! I'm not sure if it being around 100 degrees outside affected it...but what else could be the problem?
The car has about 165k miles if that might play a factor in it.
MBWorld Fanatic!
Joined: Apr 2005
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From: SCV SoCal
2002 CLK430
Could be a stuck thermostat, the radiator core could be clogged/collapsed/failed internally, a defective radiator hose could collapse under vacuum, the filler cap may not hold pressure, the system may have an air pocket - there are probably more. First, when does it overheat? While stopped? At speed?
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 18
Likes: 0
From: Los Angeles,CA
01 CLK55, 04 CLK320, 03 E500, 16 BMW 320i
Could be a stuck thermostat, the radiator core could be clogged/collapsed/failed internally, a defective radiator hose could collapse under vacuum, the filler cap may not hold pressure, the system may have an air pocket - there are probably more. First, when does it overheat? While stopped? At speed?
Senior Member
Joined: Sep 2013
Posts: 260
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From: Pittsburgh, PA
W208 CLK55 AMG, W203 C32 AMG, W163 M Class Sport
I would lean towards the car having an air pocket in the cooling system. Start the car with the radiator cap off. As the car idles, squeeze the radiator hoses repeatedly. This will move coolant through the cooling system and release the trapped air pocket. Also running the car on an incline (front end in the air) with the radiator cap off should help release the trapped air. Be ready to shut down the car in case coolant starts to overflow when the engine heats up.
If this does not work, I would replace the thermostat as it is likely stuck closed.
If this does not work, I would replace the thermostat as it is likely stuck closed.
Member
Joined: Feb 2013
Posts: 97
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From: South Africa
clk320 and sl320 V6
Over time insects and rubbish can collect between the radiator and the condenser and block airflow. What was the condition of your coolant - rusty or clean?
First thing is usually the thermostat followed by collapsed hoses to overheat when running at realistic speeds.
First thing is usually the thermostat followed by collapsed hoses to overheat when running at realistic speeds.
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MBWorld Fanatic!
Joined: Oct 2012
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From: Florida
2002 CLK 55 AMG cabriolet Eurocharged
Overheating @ cruise indicates a clogged radiator,
Overheating in traffic is the fan clutch and or electric fans.
Overheating in the driveway cold is a thermostat.
Gator
Overheating in traffic is the fan clutch and or electric fans.
Overheating in the driveway cold is a thermostat.
Gator
