Hmm, if that short hose under the thermostat housing were leaking you could get
a bubble right at the top of the thermostat which might dissipate over time if
the car were left alone which could explain the car being more drivable after
sitting for some time.
I *think* I replaced that hose but I also *think* I couldn't get the exact
right hose to fit. This was back in the Trent era. So IIRC I bought a piece of
hose at Car Quest that was something like the hose I needed. I did the same
with a piece of heater hose that runs near there. The heater hose in particular
is supposed to be 2 different sizes and was a real bugger to get on.
Definitely something for Dimitri to check out, sadly its about the WORST place
on the engine to work on...
-Curt
From: fmiser via Mercedes <mercedes@okiebenz.com>
To: mercedes@okiebenz.com
Sent: Wednesday, January 7, 2015 3:26 PM
Subject: Re: [MBZ] Compression good
> > David wrote:
> >
> > The early OM61x engines have an air bleed bolt over the
> > thermostat. If you have a leak and air is getting trapped in the
> > space above the thermostat, it could be preventing the thermo
> > from opening properly.
> Curt wrote:
>
> Yup, this one has it, just like a snowmobile. When I did the
> thermostat I pulled the bolt and filled the housing, then left it
> out until water started gushing out.
Good. But what about over time. Is there a leak somewhere else in
the system? Like the bypass hose? If so, air might be getting in
and collecting under the bleeder long after you bled it. I think
that's what David was suggesting.
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