on my 89 it still lets cold air in even if the controls are in the off position. where is the cut off for the vent. its getting kinda cold riding around like this. i did get the heater coil cleaned out but with the cold air coming through i have just got warm air not hot.

 

vac leak somewhere. the little switchydo is under the pass side dash i think

 

stryker or blue, any suggestions?