I'm in a similar boat with my '84 190D. When I asked last week many folks suggested the radiator needs replacing. I haven't done any more troubleshooting since then as the car was with my Indy for a window regulator, I'll be picking it up tomorrow AM.
The suggestion was that a radiator flush with citric acid couldn't hurt and was inexpensive in everything but time. I'll try it in a couple weeks. -Curt Date: Thu, 26 May 2011 18:55:03 -0400 From: Tim C <bb...@crone.us> To: Mercedes List <mercedes@okiebenz.com> Subject: [MBZ] 300SDL almost-overheating... Message-ID: <banlktinkwyi7n1vdm2dmabhnewaconq...@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 I feel like a newbie asking such a question. But I am not sure where to go. I don't see any coolant loss. I also don't seem to have super-high pressures, and didn't see any bubbles, though I didn't put the pressure meter on it yet. I think that would eliminate head stuff (which is a #22, relatively new)? No AC in this car. The electric fan does not come on at 105, but it isn't that hot usually so I have left that alone for now. Big fan tears up cardboard even at 80C, so I guess the viscous coupling is okay? Engine will peg at 85C on the interstate, mostly, and does not gain or lose temperature at idle in the shade; it starts to heat up slowly at idle in the sun, and heats up very quickly on low grades at low speed. My IR thermometer agrees with the gauge. I have let it get to about 110C as a test, though it has only broken 100C once on the road - but summer is just starting. Heater brings temperature back down at reasonable rate. The radiator inlet and outlet are about 20C different. I do not know the history of the radiator but it looks fairly new. As mentioned, no missing coolant. No obvious air blockage. Sudden onset worries me, but that could just be ambient temperatures - still, I didn't have any problem at 80F a few weeks ago. Acid flush and a new thermostat? What am I missing? Thanks for any clues, -Tim Newbie Yes, this means all three vehicles need something _______________________________________ 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
