Radiator Fan Shroud Installation Guide

Installation Tutorial Video

How to Install a FMG Radiator Fan Shroud

A properly installed fan shroud maximizes airflow efficiency and protects your cooling system under load. Use the section below that matches your radiator type — Cross Flow or Down Flow — to ensure a clean, secure fit every time.

Need Help?

If you run into fitment issues or have questions about your specific vehicle, contact us — All shrouds are engineered to fit with a very small amount of play, or wiggle room, to accommodate for manufacturing tolerances with the shroud and/or the radiator.

Cross Flow Radiator Fan Shroud Installation

Cross flow radiators route coolant horizontally from one tank to the other (left to right or right to left). The fan shroud mounts to the rear face of the radiator core and must align with the horizontal structural mounting points. Use this video to help measure your cross flow radiator.

What You'll Need

  • Blue Masking Tape
  • Flathead & Phillips screwdrivers
  • Drill and Tap (optional)
  • Rivnuts (optional)
  • Thread locker (optional, but recommended)

Before You Start

  • Allow the engine to cool completely before working near the radiator
  • Confirm fitment using your radiator part number and radiator dimensions posted on the shroud listing.  If they're missing, contact us. 
  • Verify the shroud mounting tabs sit flush with the top and bottom "top hat" or flange.

Cross Flow Radiator Fan Shroud Installation Steps

1

Remove the Radiator (Optional, But Recommended)

Place the radiator flat on a work bench.  Be careful as not to dent or bend any of the radiator core fines. 

2

Position the New Shroud

Place masking tape on the top and bottom mounting areas.  Align the shroud mounting tabs with the radiator top and bottom channels.  The shroud should sit flush with no gaps between the shroud edge and the radiator core.  Trace the mounting holes on the masking tape.  Remove shroud.   NOTE: If the shroud does not fit, contact us immediately!

3

Drill and Tap or Use Rivnuts

Drill and tap, or install rivnuts where you marked the masking tape.  If you purchased a Matte Black shroud that includes extra fasteners, they are metric M6x1 threads.  For "Top Hat" radiators, the top and bottom rectangular mounting points do NOT have coolant flowing through that area.  You can drill through it, without fear.  

4

Install Rubber Flap Doors

The rubber flap door nibs need to be installed with the three holes at the top of the door opening, when the shroud is vertical.  (Most shrouds can be mounted up, or down, depending on where you want the fans to be located)  Insert the rubber nibs into the matching row of holes.  Using pliers, pull on the rubber nib, which makes it thinner, and pull gently through the hole.  Release and reset the pliers, continue until the flap door is flush with the shroud.  To remove the flap door, use pliers to pull on the nib to make it thinner while at the same time pulling the flap door to remove it.  

5

Mount the Shroud

Mount the shroud on the radiator.  If you used the drill and tap method, we recommend using Blue Threadlocker.  Be careful as not to overtighten.

6

Mount the Radiator with Shroud

Reinstall the radiator and shroud assembly into the engine bay.

7

Mount the Fans

Best to mount the fans AFTER the radiator and shroud are in the car.  Install each fastener loosely, before tightening all fan mount fasteners.  All shrouds have M6x1 threaded holes, unless otherwise specified. 

Dual 14-inch fan shroud for 2000-2006 Toyota Tundra Cold Case TUN100A - Fast Monty's Garage

Down Flow Radiator Fan Shroud Installation

Down flow radiators route coolant vertically from the top tank to the bottom tank. The fan shroud mounts to the rear face of the radiator core and must align with the vertical left and right brackets, or tank braces. Use this video to help measure your down flow radiator.

What You'll Need

  • Blue Masking Tape
  • Flathead & Phillips screwdrivers
  • Drill and Tap (optional)
  • Rivnuts (optional)
  • 3/16" Pop-Rivets (optional)
  • Thread locker (optional, but recommended)

Before You Start

  • Allow the engine to cool completely before working near the radiator
  • Confirm fitment using your radiator part number and radiator dimensions posted on the shroud listing.  If they're missing, contact us. 
  • Verify the shroud mounting tabs sit flush with the left and right brackets or tank braces.

Down Flow Radiator Fan Shroud Installation Steps

1

Remove the Radiator

Place the radiator flat on a work bench.  Be careful as not to dent or bend any of the radiator core fins. 

2

Position the New Shroud

Place masking tape on the side mounting areas.  Align the shroud mounting tabs with the radiator side channels.  The shroud should sit flush with no gaps between the shroud edge and the radiator face.  Trace the mounting holes on the masking tape.  Remove shroud. 

3

Drill and Tap or Use Rivnuts

Drill and tap, or install rivnuts where you marked the masking tape.  If you purchased a Matte Black shroud that includes extra fasteners, they are metric M6x1 threads.  For side mounted "Top Hat" radiators, the side rectangular mounting points do NOT have coolant flowing through that area.  You can drill through it, without fear.  If you do not have flanges, or the rectangular braces, you most likely have a very thin alluminum structural brace runing vertically on each side.  Depending on the radiator, you can drill a 3/16" hole, but use a drill bit collar so you do not drill too far.  You can then use pop rivets to secure the included side brackets.  (Best to have those side brackets bolted to the shroud, after you mount the side brackets, remove the shroud)  

4

Install Shroud Flap Doors

The rubber flap door nibs need to be installed with the three holes at the top of the door opening, when the shroud is vertical.  (Most shrouds can be mounted up, or down, depending on where you want the fans to be located)  Insert the rubber nibs into the matching row of holes.  Using pliers, pull on the rubber nib, which makes it thinner, and pull gently through the hole.  Release and reset the pliers, continue until the flap door is flush with the shroud.  To remove the flap door, use pliers to pull on the nib to make it thinner while at the same time pulling the flap door to remove it.

5

Mount the Shroud

Mount the shroud on the radiator.  If you used the drill and tap method, we recommend using Blue Threadlocker.  Be careful as not to overtighten.

6

Mount the Radiator with Shroud

Reinstall the radiator and shroud assembly into the engine bay.

7

Mount the Fans

Best to mount the fans AFTER the radiator and shroud are in the car.  Install each fastener loosely, before tightening all fan mount fasteners.  All shrouds have M6x1 threaded holes, unless otherwise specified.

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