Question: During the course of all this, has anyone ever physically removed the water pump for visual inspection of the vanes?
Years ago.. I had a chevy 283 [may tell you how many years ago it was] that displayed the same symptoms. It turned out to be one of the vanes of the water pump had sheared off and was acting as a flapper valve in the block passages. Sometimes it would be edge wise, and coolant would flow, cooling normal... then it would flip flat across the passage and in minutes, overheat.. It got new radiators, new hoses, thermostats.. the works.. nothing worked... the water pump still pumped water so it looked like there was coolant flow through the radiator... then... the vane would shift [always while driving it, of course] and temp would go to max overheat.. Even when the water pump was finally pulled and the missing vane discovered.. we had a tough time flushing the broken part out of the block... Seems to me, this could be a possible in this case. On Sun, Feb 22, 2015 at 9:09 AM, Curt Raymond via Mercedes < mercedes@okiebenz.com> wrote: > When the car is overheating the heater does nothing. Clear symptom of no > coolant circulation. > You've missed the years I owned it and drove it and it was fine. > It all started a couple years ago with Angie and I headed to Maine, 75mph > up I495 and all of a sudden the car smelled hot. Turns out the clamp on the > lower radiator hose at the radiator had broken, the hose came off and the > coolant all fell out of the engine. I pulled into a handy rest area, zip > tied the hose back on got water from a helpful passerby and made it to a > roadside rest stop where I got a replacement hose clamp. We made it home > and the next day I changed out the water for coolant, changed the oil and > kept driving the car for 4 more months. > One day on the way to work (during the first warm day of spring) the temp > needle started to climb in heavy traffic. When I got to work the coolant > was down a quart. I filled it up. On the way home I had to stop on the side > of the highway and was down another quart. From that point on I couldn't > run the engine more than about 20 minutes or it would start to overheat and > spew coolant out the radiator. > So we had HeadgasketQ and replaced said head gasket. This seemed to cure > the issue for about 40 miles, then it came back. I retorqued the head bolts > and the problem was gone for maybe 100 miles. Then nothing I did could get > the issue to go away. Somewhere in the troubleshooting phase I replaced the > thermostat which changed nothing. > I needed a car so I bought the Jetta and the 240D sat unloved for a year > until I hauled it to Dimitri. > There have been 3 thermostats in the car from 3 different sources since > the issue started. I find it far fetched that all three (2 of which test > good in a pan of water) would fail in exactly the same way but only > sometimes. > Up to date? > -Curt > From: Curly McLain via Mercedes <mercedes@okiebenz.com> > To: Mercedes Discussion List <mercedes@okiebenz.com> > Sent: Saturday, February 21, 2015 8:27 PM > Subject: Re: [MBZ] Overheating 240D more info > > Has anyone tried turning the heater and fan on full blast when it is > overheating? that is an old time trick for desert and high altitude > driving. The heater pulls heat out of the coolant too. Often it > makes the difference between go/no go on deetriot iron of the > 60s/70s. Fortunately, the MB cooling system is pretty robust. The > only time I had to turn on the heater was mountian climbing at high > altitude. At about 12k feet my 200D (now 2.4) ran out of cooling > capacity, and we had to turn around. > > The escort Diesel tended to overheat at about 4-6k feet. > > If I understand this correctly, Dwight ran the car for miles and > years without problem, then the over heating started. If this is > correct, what changed while the car was in Dwights ownership? There > appears to be a change between no problem/problem. Something caused > the change. > > > > _______________________________________ > http://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 > > All posts are the result of individual contributors and as such, those > individuals are responsible for the content of the post. The list owner > has no control over the content of the messages of each contributor. > _______________________________________ http://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 All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
