I replaced my old thermostat after flushing my cooling system due to it being very corroded and old when I took off the T-head. However, now I keep having coolant expelled through the overflow hose from the expansion tank (I just replaced that as well with a brand new OEM tank). I bought the thermostat from Autozone and am wondering if I need to get an OEM thermostat or did I not do something right when I refilled coolant and installed new thermostat (I checked again and it can only fit one way). The engine temp never gets too hot (stays below 92c) and today was running at about 87c. Before that, never had this problem. No leaks in expansion tank or at T-head. Hope that's enough info. '91 300E.

i've had good luck with thermostats from Napa..


maybe your radiator is clogged a bit....

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

Problem solved. New cap for 6.00.

Thank you.