It pumps fresh air into the exhaust to help the catalytic converter (s) clean up the emissions.
NO.
In reality it pumps clean air into the exhaust to dilute it so that it would pass emissions tests.
That depends on the labor rate where you are; it ranges from 1.6hrs with a V8, 1.9hrs with a V6 w/o air, or 2.2hrs with a V6 w/air.
You may have a weak water pump or the engine coolant level may be low.
No, they're not the same fuel pump. The V8 requires more fuel pressure than the V6. Besides you would not want to install a used fuel pump. Way too much trouble to trust to a used part.
yes, but they make a aftermarket, pulley assembly to replace the air conditioning pump...
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No, THey have a mechanical pump on the side of the engine.
The electric fuel pump is INSIDE the fuel tank
In the gas tank