Bingo! Either the radiator is clogged, or the coolant is not circulating. Cheap aftermarket water pumps have been rumored to have the impeller blades rot off.
On Fri, Jul 13, 2012 at 5:38 PM, Curt Raymond <curtlud...@yahoo.com> wrote: > Dimitri has a 240D. > 240Ds don't have fan clutches. > > Some of the fan clutches DISENGAGE the fan at highway speed. Even if they > don't the fan is effectively doing nothing at highway speed. There is way > more air being slammed over the radiator by the car moving forward than the > fan could ever move. > > At highway speed you don't need a fan at all. > > Thus you're wrong, a bad fan clutch will not make the car overheat at > highway speed. Or rather it won't be because the fan isn't spinning, there > might be another factor at work. > > As an aside 190Ds have electric fan clutches, they will always be > disengaged when the engine is off... > > -Curt > > Date: Fri, 13 Jul 2012 14:07:44 -0400 > From: andrew strasfogel <astrasfo...@gmail.com> > To: Mercedes Discussion List <mercedes@okiebenz.com> > Subject: Re: [MBZ] Running hot. > Message-ID: > <CAC35L=ucs+khmbhnknvsjawrx+fiuhk5bozrapxwwzbw8lp...@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > The obvious question is "have you checked the coolant level"? I > presume the answer is YES and the level is NORMAL. > > If so, with the engine off spin the radiator fan. if it spins freely > without reistance the fan clutch is worn and needs to be replaced. A > worn fan clutch will cause the engine to run hotter at highway speed > than at slower speeds. At least this was the case in my W108 sedan > and W111 3.5 coupe. > > DImitri - are you reading this? > > On 7/12/12, Curt Raymond <curtlud...@yahoo.com> wrote: > > How often was the coolant changed and was the engine ever overheated? > > > > Even with genuine MB coolant if you never changed it and then overheated > the > > engine a couple times you'd probably blow a headgasket... > > > > -Curt > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > -- OK Don 2001 ML320 2012 Passat TDI DSG 1997 Plymouth Grand Voyager _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
