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  #1  
Old 10-07-2013, 08:43 PM
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Join Date: Aug 2013
Location: York, PA
Posts: 25
W124 87 300d thermostat temp

Hi my 87 300d temperature was running at or below 80 & the heat barely worked. It also has the 14 head. It's got 250k, 2nd owner, & always been taking care of. So I out an 80 degrees Wahler thermostat in it & now it's running 3/4 the way to the next line(assuming that's 100?).

Is this normal or too hot? Someone told me to put a 71 degrees one in but I would like the heat to work. It never teaches 100. I tried to see if it would go there but couldn't. The fan clutch works fine. Very worried due to the 14 head.
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  #2  
Old 10-07-2013, 08:58 PM
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Location: Barrington, RI
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If you're at 80 or close to it, the heat should work pretty well. Have you investigated other causes as to why the heat is weak?
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98 E300 "Murray", Silver, 118k mi, Stage 2 Rocketchip chip tuned, son's DD

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  #3  
Old 10-07-2013, 09:10 PM
Control Freak
 
Join Date: Oct 2011
Location: Columbia, SC
Posts: 2,953
With 80 deg C water temp, the 124 will make enough heat to roast you if it's working right.

I would go to the online factory manuals at startekinfo.com or w124-zone.com and follow the excellent troubleshooting guides there.

80 to 100 deg C is the normal operating range for these engines. The marking between 80 and 120 is 100.
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  #4  
Old 10-07-2013, 10:06 PM
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Join Date: Aug 2013
Location: York, PA
Posts: 25
The heat is definitely hot now but the car is running at about 90-95 degrees. It's was definitely not hot before I changed the thermostat when it was at about 80. I did flush the system too. Maybe that helped with the heat. It would barely run at 80 degrees this summer when it was 100 outside. The thermostat was definitely not working or maybe the flush cleaned up the sensor- if that's possible.

I was just worried about the running temperature running at 90-95 all the time because of the #14 head. Some of these threads get me so paranoid about it!

Thanks for your help!
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  #5  
Old 10-07-2013, 10:14 PM
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Location: Barrington, RI
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While 90-95 is hotter than it should be, it's not hot enough to do any harm from everything I've read. Your aux fans would kick in at 105 or 107 (I forget which). There are a number of variables....might be somewhat difficult to figure out the cause.
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06 E320 CDI "Benson", Platinum Blue, 168k mi, DD
91 300D "Otis", Smoke Silver, 122k mi, other DD
98 E300 "Murray", Silver, 118k mi, Stage 2 Rocketchip chip tuned, son's DD

Twelve other MB's owned and sold
2002 Honda Odyssey 225k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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  #6  
Old 10-07-2013, 10:55 PM
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85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
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Get another tstat and test it first this time.
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