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2001 E320- 1984 300SD
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85 Posts
Discussion Starter #1
I have always noticed that my 84 300SD has trouble heating up in the winter. My wife drives it daily about 30 miles to work and in cold weather (under around freezing) that it only heats up to about 40 degrees centigrade. Is it allowable to block off part of the radiator with cardboard such as large trucks do to help it get the engine warmer for her.
 

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1985 300SD 1988 560SEC 822 1976 450SEL 1981 300SD
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1,075 Posts
Gotta block heater on that baby? I do on mine, helps with startup etc...

Correct thermostat, keeping the revs up ( I leave mine in S for all but highway speeds).

Haven't needed to muffle the rad though. I just let the thermostat do its' thing..
 

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2003 Volvo V70 5 Speed
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1,784 Posts
sounds like a bad thermostat..
 

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MBZ '87 300SDL, MBZ '85 380SL, RR '77 Silver Shadow II, MBZ '98 E300TD
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464 Posts
I have always noticed that my 84 300SD has trouble heating up in the winter. My wife drives it daily about 30 miles to work and in cold weather (under around freezing) that it only heats up to about 40 degrees centigrade. Is it allowable to block off part of the radiator with cardboard such as large trucks do to help it get the engine warmer for her.
Thermostat is the top candidate (or lack thereof, some people get "creative" and remove them), followed by aux fan with a aux fan switch stuck in the on position (do you hear or see the electric aux fan spinning?). Buy a name brand "kit" with both seal and theromstat (cheap thermostats need to be avoided) and replace. The rest should sort itself out.

-BH
 

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560SEL 560SEC 300SEL E320 Cab. MB Metris Van / 300TD 300TE 300SDL, 300D, Unimog 406 (Gone)
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2,321 Posts
Absolutely go with the cardboard. My 300D would not heat up and that cardboard worked great. Start with half. I have to do that on my 91 Toyota 22re which runs so cool it would never get warm enough. I also have an 84SD and it does heat up but not nearly enough for comfort within 5 minutes which is what we expect from the gassers.
 
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