my 98 e320 engine temp. is running alittle higher than before. it use to stay around 85c not it'll rise to 95c. what can i do(modifications) to lower engine temp to 80c. i've changed fan clutch and fan control module a while back so i don't think that's a problem. can i substitute a different thermostat ? i can only find one available thermostat(87c) what about watter wetter, it suppose to lower coolant temp. any suggestions ?