Well I scoured the CD, and it states that this line connects to the 70deg C thermovalve. Unfortunately, I don't know where this valve is located since earlier 103's were modified (used to be located on head).
Could someone please help me out here. I'm almost certain this open vacuum line is hurting my fuel economy.
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi