When the heater only works on high, the most common problem is a blower motor resistor. The correct repair is to replace it with a new resistor.
Problems for specific Buick Century years:
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Repairpal verified Buick Century problems
Illumination of the Check Engine Light may be the result of a loose or worn gas cap.
The inside door handle may break causing the door not to open from the inside.
The outer tie rod ends on the steering linkage may wear causing excessive free play in the steering and uneven tire wear. If the worn tie rod ends are replaced, the wheel alignment should be checked and adjusted as necessary.
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell us that operating the engine with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.
An engine oil leak may develop from the rear of the engine. This is commonly caused by a failed oil pump drive o-ring seal. The leaking o-ring should be replaced to correct this concern.
A coolant leak may develop from the water pump. The engine may overheat as a result of the coolant loss. A leaking water pump should be replaced.
The steering rack may fail causing the steering to become hard to turn.