Quote:
Originally Posted by Doktor Bert
Mercedes-Benz has a chart that 'suggests' normal vent temps based on ambient temperatures.
Your 45°-47°F vent temps are pretty good. I have an adjustable switch on my A/C that allows me to bring the auxillary fan in at a lower temp/pressure. This and a GOOD fan clutch help tremendously.
Keep in mind that a W116 will overheat without a fan, even at 60-70 mph, so the fan is critical at road speeds too, though many will argue the point.
Regards,
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Thanks Bert.... I have a 603 engine , 300SDL, W126
As the car was overheating at higher speeds I changed the radiator, pump and T-stat (Behr 80 degrees)...
and through magic cooling temps are down to normal (about 90 C at all speeds!...even when I am driving 90 mph for some time).
This somehow affected my AC vent temps as a side effect.
Vent temps dropped by about 2 degrees C or 4 F. I can tell because here are the same conditions all the time...there are 2 days with partially rain..but the rest of year it is sunny and identical, boring and hot as hell.