Mustang Classic Auto Air 6 Blade Fan (1965-1967) Installation Instructions

Tools Required:
  • Ratchet
  • 1/2 inch Short Socket
  • 3/8 inch Deep Socket
  • 1/2 inch Wrench
  • Flat Blade Screw Driver
  • Funnel
  • 2+ Gallon Bucket
Install Difficulty:
  • Moderate
  • Moderate Project
Mustang Classic Auto Air 6 Blade Fan Install Image
1. To begin installing your new Mustang Classic Auto Air 9-112 6 Blade Fan, loosen the drain valve (on the lower passenger side of the engine) to drain the coolant into the bucket.
2. While the coolant is draining, remove the Mustang fan shroud (if your Mustang is equipped) by loosening the four bolts that fasten the shroud to the radiator using a deep well 3/8 inch socket. Only cars originally equipped with air conditioning had a shroud (and many of those cars have lost their shrouds over the years). Do NOT try to remove the shroud from the engine bay. Just rest it on top of the water pump pulley. The shroud should stay in the engine bay during this project so you do not damage the radiator and so you don't forget to put it back in place before reinstalling the radiator. CAUTION: When removing the upper passenger side bolt, beware of the positive battery post (the radiator is grounded, so if your ratchet comes in contact with the positive battery post it will complete a circuit).
Mustang Classic Auto Air 6 Blade Fan Install Image
Mustang Classic Auto Air 6 Blade Fan Install Image
3. While the Mustang radiator continues to drain, remove three of the four bolts holding the radiator in place using the 1/2 inch wrench (the brackets usually make using a socket impossible). CAUTION: When removing the upper passenger side bolt, beware of the positive battery post (the radiator is grounded, so if your ratchet comes in contact with the positive battery post it will complete a circuit).
4. By now, there should be a little more than a gallon of coolant in the bucket. Tighten the drain to stop the flow and move the bucket under the upper radiator hose. Loosen and remove the Mustang hose band clamp with the screw driver and watch as a small amount of coolant comes out of the hose. Then move the bucket under the lower hose and remove the clamp. Usually, a fair amount of coolant will be left to drain out of the bottom inlet.
5. Remove the final 1/2 inch bolt, which should allow you to carefully remove the radiator. You may need to rotate the fan slightly to free the lower radiator inlet. Be careful to prevent the radiator from making contact with the fan as you remove it.
Mustang Classic Auto Air 6 Blade Fan Install Image
Mustang Classic Auto Air 6 Blade Fan Install Image
6. Use the 1/2 inch short socket to remove the four bolts securing the fan (a deep socket will not clear the A/C condenser). Note the tilt of the fan blades before removing the fan, as the new Mustang fan will be installed with the blades tilted in the same direction.
Mustang Classic Auto Air 6 Blade Fan Install Image
7. Install new Classic Auto Air fan. Since the fan has elongated holes, the fan will naturally center itself as the four bolts are installed. Tighten the bolts in an “X” pattern.
Mustang Classic Auto Air 6 Blade Fan Install Image
8. Reinstall the Mustang radiator. It may/will be more difficult to put the radiator back in than it was taking it out, because the lower radiator inlet has more blades to clear. You will likely need to rotate the fan as you work the radiator back in place. If you removed the shroud from the engine bay at some point during the process (or if you are adding a shroud), make sure you hang it back on the water pump pulley before reinstalling the radiator (because it will not fit between the radiator and fan without causing damage to the radiator).
9. After reinstalling the Mustang radiator bolts and nuts that secure the radiator, take a good look at the tips of the fan blades to ensure they will not make contact with the radiator. Mine had one blade with less than 1/8 inch of clearance. CAUTION: Be careful of the passenger side upper bolts of the radiator and shroud, which are close to the positive battery terminal.
10. Reattach the shroud, if equipped. It is easiest to attach the passenger side bolts first, since the driver side has easier access, and you may need to do some “pulling” to re-center the shroud around the fan. Make sure the fan blades will not strike the shroud.
12. Use a funnel to add new coolant until the coolant is 1 inch below the top. Remove all of the tools from the engine bay and start the engine. Listen and look to ensure the fan is not making contact with the radiator or the shroud.
13. In a few minutes, the coolant will suddenly drop when the thermostat first opens. At that point, add additional coolant as needed. Replace the radiator cap. Congratulations, you now have the additional cooling capacity from your new Mustang Classic Auto Air 6 Blade Fan!