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2014 E350 Thermostat Hose

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Old Jan 6, 2024 | 03:37 PM
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2014 E350
2014 E350 Thermostat Hose
Hey all,

i just replaced my thermostat in my 2014 E350 but the hose that is connected to the thermostat is leaking from the side. Is this a one time use screw or something?



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Old Jan 6, 2024 | 03:44 PM
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Noooo... it must be a 50¢ O-Ring seal in there.
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Old Jan 6, 2024 | 03:47 PM
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perhaps the screw drilling is a through hole... so leaking is guaranteed
You have to use sealant on the screw or thread locker to seal it.

Last edited by CaliBenzDriver; Jan 6, 2024 at 03:55 PM.
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Old Jan 6, 2024 | 03:52 PM
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Originally Posted by CaliBenzDriver
Noooo... it must be a 50¢ O-Ring seal in there.
Thank you for the response!

I didn’t put an O-ring seal. Where would it go? Behind the screw or the hose itself?
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Old Jan 6, 2024 | 04:00 PM
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curve ball
Originally Posted by MB4429
Thank you for the response!

I didn’t put an O-ring seal.
Where would it go?
Behind the screw or the hose itself?
yeah, O-ring is on the pipe fitting.

Remove the screw to feel if this is a through hole... poke inside with a wire or small screw driver or take a phone camera picture...
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Old Jan 6, 2024 | 09:09 PM
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2014 E350
Originally Posted by CaliBenzDriver
yeah, O-ring is on the pipe fitting.

Remove the screw to feel if this is a through hole... poke inside with a wire or small screw driver or take a phone camera picture...
The screw is fine. It’s the o-ring seal. By any chance, do you know the part number or the diameter of the o-ring that’s supposed to go here?
Last edited by MB4429; Jan 6, 2024 at 10:09 PM.
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