Greetings Everyone,
I have a 1989 Buick LeSabre 3.8 liter with electronic touch climate control. The Air handler is actuated by a vacuum line
from the engine. I am having a problem with Luke warm air coming from the ducts when i drive on the highway or at speeds above 40 mph. When Iam standing still or at low speed it blows very hot. I have checked the vacuum line coming form the engine to the air handler for leaks and have found none. Also I have installed a new heater core. I checked the long silver lever that moves the air duct door from heat to A/C and it is functions fine. Does anyone have any ideal on how to repair this? Thank you very much!!