It is very unusual that the control arm bushings would be bad this soon. Has a repair shop looked at them? It is not an easy job especially if you are doing them at home. Go to a parts house or a bookstore and get a Haynes Manual and it will give you full details with pictures.
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You can get the pump for about $80
the temperature control actuator is behind the dash board.
Chevrolet Impala was created in 1958.
1985 Chevrolet impala
It is cheaper to replace it with a remanufactored pump.
It is located on the throttle body.
It is under the dash near the steering column.