300 SD overheating
Thread Starter
Newbie
Joined: Jul 2010
Posts: 5
Likes: 0
500 sl
300 SD overheating
I have a 1983 300sd. I have replaced the radiator, thermostat, waterpump and bled the air out of the system. The car still wants to run at a temp just below overheating. Any answers?
Senior Member
Joined: Oct 2004
Posts: 272
Likes: 3
From: Michigan
SL600 r230, SL600 r129, SL500 r230, ML320, C280 Sport, R170 450SL, 190e 2.3 16V (2)
Did you verify the gauge is accurate?
Does the electric fan work? When the radiator gets hot, does the fan clutch engage?
Do you loose any coolant? If so, may have a bad head gasket.
Does the electric fan work? When the radiator gets hot, does the fan clutch engage?
Do you loose any coolant? If so, may have a bad head gasket.
Thread Starter
Newbie
Joined: Jul 2010
Posts: 5
Likes: 0
500 sl
Thanks, The guage is accurate, the elec. fan works, clutch fan is new and I'm not losing any water.
MBWorld Fanatic!
Joined: Jun 2010
Posts: 1,246
Likes: 52
From: tennessee
s320
As these fine diesels age,it is important to flush and clean block good.I use one gal vinegar added to water with thermostat out.Run car really good a hour or more driving.Then drain,when block is cold run water thru engine backwards.You will see chunks of rust.Run her in summer with plain water till all rust is gone,then fill her with antifreeze and distilled water.
Thread Starter
Newbie
Joined: Jul 2010
Posts: 5
Likes: 0
500 sl
As these fine diesels age,it is important to flush and clean block good.I use one gal vinegar added to water with thermostat out.Run car really good a hour or more driving.Then drain,when block is cold run water thru engine backwards.You will see chunks of rust.Run her in summer with plain water till all rust is gone,then fill her with antifreeze and distilled water.
Senior Member
Joined: Oct 2004
Posts: 272
Likes: 3
From: Michigan
SL600 r230, SL600 r129, SL500 r230, ML320, C280 Sport, R170 450SL, 190e 2.3 16V (2)
If you can show me some proof that 70/30 is better, I'll accept and change my opinion. But when a marketer of a product says less is better, I gotta believe them.
