I own a 1999 Buick Park Avenue, 3.8 L, V6, Base Model, the
defrost work fine, but the " heater " part does not. When I drive out in the highway and I put the tempeature setting at say 74 or 75 degrees F it just sits there and does absolutley nothing - no heat ! Alot of times, there will be this " ticking / clicking " noise as if the blower motor is trying to do something. The other day ...