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C300 - running hot

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Old 11-01-2009, 05:34 PM
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2009 C300
C300 - running hot

Anyone else's running a little hot? The gauge reads normal, but as soon as we crank the car on after a full night's rest, the fans start blasting and can't help but smell the coolant. No lights are on and temp reads normal.
Old 11-01-2009, 06:50 PM
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what does coolant smell like?
Old 11-01-2009, 08:25 PM
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Originally Posted by WWMIndy
what does coolant smell like?
Burning coolant smells like syrup. It's got a distinct sweet smell.
Old 11-01-2009, 08:27 PM
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yes exactly. It smells like a syrup but... burnt
Old 11-01-2009, 08:33 PM
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Originally Posted by Narsh
yes exactly. It smells like a syrup but... burnt
Check below your car after it's parked for a while, make sure there isn't any green residue on the floor. If there isn't, you should be safe (the coolant light usually will come on way before your car loses too much coolant).

If you just had your car service recently (or your coolant flushed), I know sometimes some left over coolant can be spilled around the engine area. That may need to be burned off.

Good luck!
Old 11-01-2009, 08:35 PM
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Thanks Yogi, I already checked the most obvious stuff - the car has 1200 miles on it so no service yet. Just started getting a little worried because the fans kick on high right when I turn it on
Old 11-02-2009, 05:04 AM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The fan should not do this. Just watch the temp gauge. Report it to your dealer. Sounds like a faulty fan temp sensor.
Old 11-02-2009, 09:29 AM
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Thanks for the heads up. I am making an appt. I'll keep everyone posted.
Old 11-02-2009, 09:31 AM
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Are you hearing the coolant fans turn on or are you hearing the buzzing of the air pump? This typically turns on only on cold startups.
Old 11-02-2009, 09:38 AM
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Cooling fans. Its not subtle by any means.
Old 11-02-2009, 10:39 AM
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2008 C300 Sport, RWD, US
Originally Posted by yogi98
Check below your car after it's parked for a while, make sure there isn't any green residue on the floor. If there isn't, you should be safe (the coolant light usually will come on way before your car loses too much coolant).

If you just had your car service recently (or your coolant flushed), I know sometimes some left over coolant can be spilled around the engine area. That may need to be burned off.

Good luck!
With the underbody covers on, you might not have enough for it to find its way on the ground. Depends on how much its leaking.

My experience is that you don't have to have but a very small leak to smell antifreeze burning off.

Lift the hood and look around. Its a greenish liquid.

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