anyone? thanks

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1984 300D "Brown (and Blue) Betty" Over 200k but the odometer isn't counting

Find a steep hill and park with nose uphill. Start engine, put heater on full blast, run engine until air is purged.

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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

So where does the air go? Wouldn't you have to crack the expansion tank cap or something?

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AlexTheSeal: hack mechanic, inadvertent drifting champ, builder of infernal devices, professional epistemologist

'87 300D Turbo, roadtrip mileage champ (for sale!)
'92 Isuzu Trooper, mudder extraordinaire (for sale!)
'82 Honda Silverwing, cockroach of motorcycles
And various boring daily drivers...

Sorry, I assumed it was a given that the radiator cap should be off.

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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

No problem, I get it now.

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AlexTheSeal: hack mechanic, inadvertent drifting champ, builder of infernal devices, professional epistemologist

'87 300D Turbo, roadtrip mileage champ (for sale!)
'92 Isuzu Trooper, mudder extraordinaire (for sale!)
'82 Honda Silverwing, cockroach of motorcycles
And various boring daily drivers...

And additional coolant should be added to replace the air that is bled out.

Clamp off the blow by tube (vent tube from rad to overflow), then pump the upper rad hose (NO!!! NOT LIKE THAT!!!! You just 'squeeze" it in and out.)

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol

I just had an issue with air trapped in my SDL coolant system.
After a few days the air worked its way to the top of the radiator, but I would follow the advice above and raise the front of the car slightly to help things along. You can tell if there is air in the rad if you squeeze the top hose and get very little resistance.

I then filled the coolant tank up to the point where coolant flowed to the rad through the 'vent tube'. This will displace any trapped air in the rad. It took about 2 Quarts to fill before the coolant backed-up through the vent tube. Since then, no problems.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown

I had an interesting experience in refilling the SDL. With the back end sitting about 12 inches above normal (on a jack) and after filling the expansion tank to the very top and allowing the system to fill as much as it is capable of, I started it and put the heat on high. Let it idle and the temperature climbed up over 100C.

OK, so, how to get more coolant into it?

Took off the upper hose and poured coolant directly into the head, a bit at a time, until it was completely full. It took about another quart. Didn't seem like this would be the solution.

Started it again and the temp climbed up to its normal 88 or so.

Took it for a drive and it remained at 88-90.

Refilled the tank with another pint or so after it cooled off.

Apparently, the small amount of additional coolant that was added directly to the head was definitely necessary.

As I understand it, the front end should be higher.

Recently, I had to replace a thermostat. Afterwards, with the front end on ramps, I had no problems "burping" the system of air.

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Sam

84 300SD 350K+ miles ( Blue Belle )

It appears that I have misread Dave's advice. His advice is to jack up the back end to drain the system.

However, clearly, this would not be advantageous to fill the system.

I've only had my car 2 years now and I just changed my anti-freeze for the second time and the only procedure that worked for me was loosening the water pump cross over tube banjo bolt until a little dribble came out. Ran engine for a few minutes this way and it bled the system.

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1981 240d
Newport,RI

The easiest way would be to remove a heater hose while filling until it runs out, the re-attach it and finish topping off the system.

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85 300CD
83 300TD
78 240D (daughter)

I make my vehicles do the hula: grab a bumper and wiggle it. Then whistle a Don Ho song after remembering to turn the heater valve on.

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daBenz - 1970 220D

Taking note of where you live, is this in anticipation of the heat that will be coming from the vents of the Benz?

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Sam

84 300SD 350K+ miles ( Blue Belle )