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  #1  
Old 08-13-2008, 12:35 PM
Slow Attack Submarines
 
Join Date: Jun 2006
Location: NYC
Posts: 242
Filling radiator/block

(1982 300CD Turbo Federal)

I'm doing a coolant change/flush, and after removing the old coolant (yellow stuff, looked pretty good) I closed both plugs (radiator and block) and filled the radiator from the expansion tank. After turning the car on and driving around the neighborhood, the car heated up EXTREMELY quickly, reaching operating temp in about 120 seconds and then continuing to climb- I shut it off before it got over 100 deg. C, but the needle was moving, visibly, quite quickly.


I've looked through older threads and seen references to filling the radiator first using the upper IP-side hose and then using the expansion tank- I did not do this. Could this be the reason why the engine tried to overheat almost immediately, or is it a burping (which I've never been able to do successfully) issue of some sort?

Thanks to anyone who can give me a lead...

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1992 300D 2.5T 249k - Parked with a bad transmission
1981 300SD 142k - Daily driver
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  #2  
Old 08-13-2008, 12:53 PM
bgkast's Avatar
Rollin' on 16s
 
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
Sounds like your car needs a burp!
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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Old 08-13-2008, 01:25 PM
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Join Date: Sep 2004
Posts: 8,971
The FSM recommends (for the purpose of filling with coolant) running the engine intermittently with the heater on and expansion bottle cap not installed.

In my experience, the process is sped up a bit if you remove the upper hose from the radiator (engine not running) and hold it vertically while adding coolant to the hose.
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  #4  
Old 08-14-2008, 11:43 PM
Slow Attack Submarines
 
Join Date: Jun 2006
Location: NYC
Posts: 242
She just needed a burp, which she got.

I've actually found the block draining process to be much less difficult than advertised- the trick seems to be to press the socket and extension on to the bolt first, and then attach the wrench to the extension.

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1981 300SD 142k - Daily driver
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