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sounds like you have a broken vacuum hose for heater controls or vacuum reserve tank if controls changes when accelerating or going up steep hill, check your vacuum hoses from engine to inside controls
Under the dash there are doors that open and close to give you hot or cold. Sounds like you have a vacuum leak in a hose or one of the vacuum motors that moves the door I would hook up a cheep hand held vacuum pump to each one and see if they hold vacuum also the one that opens the door that keeps the heat blowing is the one to look at if the door stays open and you have heat with the hand pump and you don.t have to keep pumping it the hose or farther back is leaking.
Check the vacuum diaphragm in the heater hose. It's a little metal valve with a hose going to it. When the heat is turned on the vacuum line opens the valve letting hot water pass through the heater core.
There is a tsb about replacing the secondary heater door for that noise. The door warps and hits the main door. It can also cause the heat control to be inop.The dash has to be removed to replace the door.
You have a vacuum leak that is not only affecting motor operation but also the correct operation of the vacuum switch controlling your damper. Need to have that matter resolved -check all vacuum hoses and fittings for integrity/tightness. Vacuum switch itself might be leaking!
This sounds like a problem with the one of the temperature door actuator motors. Depending on which side has the problem- Hot on dr. side when you want heat but cool oin pass. side when you want heat. Or vise-versa. These motos are approx. $75 plus 1 1/2 hours labor to install.
for more info, see this page i found...... http://www.greatautohelp.com/more_oldsmobile_questions.html