Amperage draw determines to work an electric motor is doing.
You want something closer to 30 amp draw to cool an old car.
Feets is right on here....OEM fans are the only way to go....I run the famous 90's ford taurus V6 fan....awesome amount of air. Pulls 30+ amps....over 50 at start up. Google it...it is one of the most popular to use.
