I've had to replace the radiator in every 124 and 201 we've gotten that had green antifreeze in it. The wrong coolant and neglect is deadly to these radiators.
On Sat, May 21, 2011 at 7:25 PM, LWB250 <lwb...@yahoo.com> wrote: > If it's load dependent, than I would be willing to bet you've got a clogged > radiator. > > If ambient temps remain relatively constant and the load on the engine > increases, the thermostat should moderate the flow through the radiator. > Assuming that the thermostat is OK (and it probably is) what is happening > is the latent heat built up in the engine is not being "removed" through the > radiator. > > If the core is clogged, even just partially, the amount of surface area > available to the coolant is reduced, preventing it from dumping all of the > heat load "out" through the radiator. > > You can easily confirm this if you get an IR thermometer and measure the > temperature of both the inlet and outlet of the radiator when the engine is > warmed up. You should see a noticeable temperature drop from inlet to > outlet, even with the car sitting still and idling. A good justification to > buy a cheap HF IR thermometer. > > What you describe is a classic example of a clogged radiator from my > experience. And I've had a couple of them in both 123 and 126 chassis cars. > > Dan > > > ________________________________ > From: Curt Raymond <curtlud...@yahoo.com> > To: Diesel List <mercedes@okiebenz.com> > Sent: Saturday, May 21, 2011 8:10 PM > Subject: Re: [MBZ] Hot 190D > > Doesn't seem to be speed dependent, does seem to be load dependent. > > Specifically if I'm coming up an incline in high gear with low rpms... > > -Curt > > Date: Sat, 21 May 2011 11:31:18 -0700 (PDT) > From: LWB250 <lwb...@yahoo.com> > To: Mercedes Discussion List <mercedes@okiebenz.com> > Subject: Re: [MBZ] Hot 190D > Message-ID: <39017.15525...@web65711.mail.ac4.yahoo.com> > Content-Type: text/plain; charset=iso-8859-1 > > Another thing to consider - does it run hot at or above a certain speed?? > If so, it's clogged. > ? > Dan > ? > ? > > From: LWB250 <lwb...@yahoo.com> > To: Mercedes Discussion List <mercedes@okiebenz.com> > Sent: Saturday, May 21, 2011 2:29 PM > Subject: Re: [MBZ] Hot 190D > > If you pull the radiator, just stick a garden hose in the inlet and see how > much comes out the bottom - you'll know if it's clogged. > ? > Not uncommon for a radiator to be clogged in a car that old.? Usually under > $100 to have it rodded out. > ? > Dan > > From: Jim Cathey <j...@windwireless.net> > To: Mercedes Discussion List <mercedes@okiebenz.com> > Sent: Saturday, May 21, 2011 10:19 AM > Subject: Re: [MBZ] Hot 190D > > > So my '84 190D has always run hot, the needle would go up to around 95 > and drop back down and up and down slowly while driving but it was never an > issue, now with the arrival of warmer weather it seems to be getting worse. > > If it's not the thermostat, chances are that it's the radiator. > Try a citric acid flush, you can use your old thermostat to make > the flushing tool. > > You did double-check the head temperature with an IR thermometer > to make sure you don't have a gauge/sender problem, right? > > -- Jim > > > > _______________________________________ > 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 > _______________________________________ > 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 1992 300D 2.5T 1990 300D 2.5T 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
