I have an 1986 Audi 5000s with a 2.2 l five cylinder engine with 109,000 miles that has a cold start problem, runs great when it starts. Replaced the thermo time switch, the cold start valve, multi-function temperature sensor and the coolant temperature sensor. Haines manual says there is a frequency valve relay that controls the cold start but cannot locate it. Help, I want to get this car running for my college student daughters.