i just replace the Thermostat n flush the coolant by opening the screw from bottom of the radiator , i did a quick start when the Radiator screw n thermostat was open to c if i can get more coolant out but nothing out.
so i put thermostat n closed the screw. i start it n the temp is going up but no Heat inside, blowing cold air n it seams like coolant is not circulating.
Temp goes high n the 2 fans in front turns on.
how do i bleed air ???
is it possible i broke the water pump

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1999 W210 E300 Turbodiesel

Park the car uphill. Take cap off coolant expansion tank. Start car. Rev engine loudly and for LONG periods of time. Air will force it's way out the exp. tank.

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1984 300D: 275,000 miles (soon to be for sale)

In search of my 1987 300D in anything but white.

In addition, with the car pointed uphill, fill the engine by removing the top radiator hose at the radiator and pouring coolant into the hose so it runs into the engine. Be careful not to damage the plastic neck on the radiator.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

X2. That will get it done.

You didn't break anything, you just need to fill as per above, until you can't get anymore in. Then take it for a drive until the thermostat opens up - your heat will return.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman

this morning i turned it on c if it's gonna work so i can go to work with it, but it was same problem, temp were going close to 80 but still no heat inside,
today im gonna try to put stand in the front n c if all thi air would come out.

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1999 W210 E300 Turbodiesel

sorry guys forgot to mention my car, it's 96 E300D

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1999 W210 E300 Turbodiesel

It might run high until you get full circulation and remove any air pockets. Don't run it at a dangerous temp, but don't worry if it goes higher than usual at first. As the others have said, get the nose as high as you can - (a steep hill work well) and top it off through the upper radiator hose.

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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman

Your 96 E300D has a bolt at the front of the block for the purpose of getting the air out of the cooling system. It has a very flat head, take it out, fill the block and coolant tank until it runs out of the hole where the bolt came out of. Replace the bolt, and then warm up the engine and re adjust coolant level in expansion tank if needed.

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96 E300d

do u know where exactly located???

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1999 W210 E300 Turbodiesel

For future reference, that bolt is located adjacent to the fuel filter housing and the engine head, right where the top radiator hose connects to the engine.

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96 E300d

Fill tank with water, start engine turn on heat let it run until warm and check level. It will burp itself.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

One sure way to bleed air in a cooling system is to draw a vacuum in the cooling system until all hoses has collapsed. Then let the vacuum in the cooling sytem suck in the coolant.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked