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How to Install a Mishimoto Radiator for a 1979-1993 Mustang 5.0L

Installation Time

3 hours

Tools Required
  • 15 Quart Drain Pan
  • 1.5 - 2.5 Radiator Hose Clamps - 4
  • New Upper Radiator Hose
  • New Lower Radiator Hose
  • New Heavy-Duty Water Pump (Optional)
  • 50/50 Coolant Mixture 2 Gallons
  • M6x16 Bolts (or SAE equivalent) - 4
  • M6 Nuts (or SAE equivalent) - 4
  • M6 Flat Washers (or SAE equivalent) - 4
  • M6 Split Washers (or SAE equivalent) - 4
  • 7/16 Box End Wrench
  • 18mm Box End Wrench (or Crescent Wrench)
  • 3/8 Wrench
  • 5/16 Nut Driver
  • Adjustable Pliers
  • Metric Allen Wrench and/or Box End Wrench (for the M6 (or SAE equivalent) bolt and nut
American Muscle
Shop Parts in this Guide

Installation

Installation

1. Remove the mechanical fan and fan shroud.

  • a. Disconnect the negative battery cable.
  • b. Using the 7/16” wrench, loosen the four bolts holding the stock fan in place.

  • Using the 18mm wrench (or crescent wrench), loosen the tension (see white arrow in photo above) and remove the serpentine belt.
  • Remove only three of the fan bolts.
  • Using the 3/8” wrench, remove the two fan shroud bolts.

  • Disconnect the low coolant connecter from the overflow tank cap.

  • Remove the overflow tank rubber hose from the radiator.

  • Remove the bolt holding the fan in place and wiggle the fan loose.
  • REMEMBER THIS STEP; YOU WILL HAVE TO REVERSE IT LATER. Lift the shroud and fan up and out of the car at the same time.

2) Drain the radiator.

CAUTION:do NOT drain the radiator when the engine is hot.

  • Place a 15 quart drain pan under the car below the radiator drain petcock (on the passenger side of the radiator).
  • Remove the radiator cap and slowly loosen the radiator drain petcock.

NOTE:if you open the petcock too much, coolant will flow quickly and splash out of the drain pan and onto the floor.


  • Once coolant has stopped flowing, close the petcock and move the drain pan under the lower radiator hose.

  • Using the 5/16” nut driver or adjustable pliers, disconnect the lower radiator hose at the radiator and allow the coolant to drain.


  • Using the 5/16” nut driver or adjustable pliers, disconnect the upper radiator hose from the top of the radiator.



3) Remove the radiator.

  • Using the 3/8” wrench, loosen the radiator bracket bolts and remove the brackets.

  • Lift the radiator out of the car making sure not to dump any coolant out of the lower radiator opening.
  • Pour any remaining coolant out of the lower radiator opening into the drain pan.
  • OPTIONAL:at this point it is recommended that you replace the water pump with a heavy-duty version. That procedure is not covered in this guide.
  • Using the 5/16” nut driver, loosely connect the new lower radiator hose to the water pump using a new hose clamp.

4) Install the new Mishimoto aluminum radiator.

NOTE:Take care not to bump the radiator against any objects (such as the water pump pulley – see photo). This will damage the cooling fins.


  • Place the radiator on the rubber pads at the bottom of the radiator support.



  • Secure the radiator using the brackets and bolts removed in step 3a.

NOTE: Once the brackets are bolted down, you may need to bend the brackets down to secure the radiator.


  • Using the 5/16” nut driver, connect the lower radiator hose to the radiator using a new hose clamp.
  • Using the 5/16” nut driver, tighten the lower radiator hose at the water pump.
  • Using the 5/16” nut driver, connect the new upper radiator hose to the water pump and radiator using a new hose clamps.


5) Install the fan and fan shroud.

  • Lower the shroud and fan together into place (reverse step 1i).

  • Use two fan bolts to hold the fan in place.

  • Position the shroud against the new radiator.

  • Use two new M6 bolts, flat washers, split washers, and nuts (or SAE equivalent) to attach the stock shroud to the radiator.


  • Use two new M6 bolts, washers, and nuts (or SAE equivalent) to attach the bottom of the shroud to the radiator.
  • Install the serpentine belt.
  • Install the remaining fan bolts and tighten all four.
  • Connect the rubber hose from the overflow tank to the radiator.
  • Connect the low coolant connector to the overflow tank cap.

6) Fill the radiator.

  • Using a 50/50 coolant solution, slowly fill the radiator until the solution almost reaches the top.
  • Connect the battery cable.
  • Leave the radiator cap off and start the car.
  • Slowly pour more coolant into the radiator until it almost reaches the top.
  • Secure the radiator cap to the radiator and allow the car to reach operating temperature.
  • Allow the engine to cool.
  • Once the engine is cool, remove the radiator cap and fill the radiator with Coolant.

BEFORE

AFTER

(WITH A MISHIMOTO LIGHTWEIGHT ALUMINUM SHROUD KIT W/ DUAL HIGH FLOW 12IN FANS)

This guide applies to Mustang years: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993 and Submodels: Foxbody

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