I have a 1989 300TE wagon. In cold weather, if the climate control is in the "normal" position and the fan control speed is set to "auto", it takes awhile for the fan/heat to come on. I was told this is normal and it takes awhile in the "auto" position because the coolant needs to warm up. If I set the fan control speed to either "high" or "low" the fan comes on immediately. Is my system working properly????