Radiator

Complete removal and replacement of the radiator on a 1972 Ford F-100 with 302ci V8, including coolant drain, hose and transmission cooler line disconnection, and radiator mounting hardware removal.

Warnings

Tools required

Parts

• Radiator assembly × 1 — Use OEM specification or verify core size and inlet/outlet configuration
• Upper radiator hose × 1 — Use OEM specification
• Lower radiator hose × 1 — Use OEM specification
• Radiator hose clamps × 4 — Worm gear style, appropriate diameter
• Radiator cap × 1 — 13-16 PSI pressure rating
• Transmission cooler line O-rings × 2 — If equipped with automatic transmission

Fluids

• Ethylene glycol green 50/50 — 15 qt

Preparation

1. Ensure engine is completely cold to the touch before beginning work
2. Park vehicle on level ground and engage parking brake
3. Disconnect negative battery cable to prevent accidental fan engagement
4. Place large drain pan beneath radiator drain petcock location
5. Remove hood for improved access (optional but recommended)
6. Inspect radiator mounting points and support brackets for corrosion damage before beginning removal

Procedure

1. 1

   Drain cooling system
   Remove radiator cap by pressing down and turning counterclockwise. Locate drain petcock on driver side lower radiator tank. Turn petcock counterclockwise by hand to open and drain coolant into drain pan. If petcock is seized, remove lower radiator hose instead. Allow system to drain completely.
   Torque spec

   Drain Petcock5 Nm (4 lb-ft)
2. 2

   Remove upper radiator hose
   Using flat blade screwdriver or pliers, loosen the hose clamp securing upper radiator hose to radiator inlet (top of radiator). Slide clamp back along hose away from radiator. Twist hose gently to break seal, then pull hose off radiator neck. If hose is stuck, carefully use flat blade screwdriver to separate hose from neck without damaging radiator tank.
   Torque spec

   Upper/Lower Hose Clamps3 Nm (2 lb-ft)
3. 3

   Remove lower radiator hose
   Loosen hose clamp securing lower radiator hose to radiator outlet (bottom of radiator). Slide clamp back along hose. Twist and pull hose off radiator neck. Additional coolant will drain from this connection into drain pan.
   Torque spec

   Upper/Lower Hose Clamps3 Nm (2 lb-ft)
4. 4

   Disconnect transmission cooler lines
   If equipped with automatic transmission, locate two transmission cooler lines connected to passenger side of radiator tank. Using appropriate line wrench, loosen fittings on both cooler lines. Place shop rag beneath connections to catch residual ATF. Carefully remove both lines and plug or cap openings to prevent contamination.
   ℹ️Manual transmission equipped vehicles do not have transmission cooler lines and this step can be skipped.
   Torque spec

   Transmission Cooler Lines25 Nm (18 lb-ft)
5. 5

   Remove radiator shroud bolts
   Remove the 4 bolts securing the fan shroud to the radiator. Leave shroud attached to fan blade assembly and rest it back toward engine. This allows radiator to be removed without disturbing fan assembly.
6. 6

   Remove radiator upper mounting brackets
   Remove the 2 bolts securing the upper radiator mounting brackets to the radiator core support. These brackets secure the top of the radiator to the vehicle. Note bracket orientation and any rubber isolator positions for reinstallation.
   Torque spec

   Radiator Mount Bolts12 Nm (9 lb-ft)
7. 7

   Remove radiator from vehicle
   Carefully lift radiator straight up and out of engine compartment. The bottom of radiator sits in rubber mounting saddles on lower radiator support; no bolts secure the bottom. Tilt top of radiator slightly toward engine to clear upper core support, then lift vertically. Be careful not to damage radiator fins on surrounding components.
   ⚠Residual coolant will remain in radiator core. Keep radiator level during removal to prevent spills.
8. 8

   Inspect and clean mounting areas
   Inspect lower radiator support rubber mounting saddles for cracks or deterioration and replace if damaged. Wire brush any rust or corrosion from radiator core support mounting surfaces. Check that drain petcock is closed on new radiator before installation.
   ℹ️This is an excellent opportunity to inspect water pump, hoses, belts, and fan clutch while radiator is removed.
9. 9

   Install new radiator
   Lower new radiator into position, guiding bottom tanks into rubber mounting saddles on lower support. Align radiator so that mounting bracket holes line up with holes in core support. Ensure radiator sits squarely and is not cocked to either side.
   ⚠Do not force radiator into position. Verify all hoses and lines are clear of radiator path during installation.
10. 10

    Install upper mounting brackets
    Install upper radiator mounting brackets with bolts hand-tight first to verify alignment. Ensure rubber isolators are properly positioned between brackets and radiator. Torque mounting bolts to specification. Do not overtighten as this can distort mounting brackets or damage the radiator tanks.
    Torque spec

    Radiator Mount Bolts12 Nm (9 lb-ft)
11. 11

    Reconnect transmission cooler lines
    If equipped with automatic transmission, install new O-rings on transmission cooler line fittings. Thread fittings into radiator tank by hand until seated, then torque to specification using line wrench. Ensure lines are not kinked or stressed.
    Torque spec

    Transmission Cooler Lines25 Nm (18 lb-ft)
12. 12

    Reinstall fan shroud
    Position fan shroud against radiator ensuring proper alignment around fan blades. Install and tighten the 4 mounting bolts securing shroud to radiator. Verify fan blade has proper clearance and does not contact shroud at any point of rotation.
13. 13

    Install radiator hoses
    Slide new hose clamps onto radiator hoses before installation. Push upper radiator hose firmly onto radiator inlet neck and engine thermostat housing outlet. Position clamps 1/4 inch from end of hose and tighten to specification. Repeat for lower radiator hose, connecting radiator outlet to water pump inlet. Ensure hoses are fully seated on necks before tightening clamps.
    Torque spec

    Upper/Lower Hose Clamps3 Nm (2 lb-ft)
14. 14

    Fill cooling system
    Close drain petcock by turning clockwise hand-tight only. Using funnel, slowly pour 50/50 ethylene glycol coolant mixture into radiator filler neck until level reaches bottom of neck. Allow time for coolant to flow through system and air pockets to escape. Continue filling until coolant level stabilizes. Install new radiator cap.
    ℹ️System will require additional coolant after initial startup and burping. Have extra coolant available.
    Torque spec

    Drain Petcock5 Nm (4 lb-ft)
15. 15

    Bleed cooling system
    Reconnect negative battery cable. Start engine and allow to warm up to operating temperature with radiator cap removed. Watch coolant level and add coolant as air pockets are purged and level drops. Squeeze upper radiator hose several times to help release trapped air. When thermostat opens, coolant will circulate rapidly and level will drop further. Continue adding coolant until level stabilizes and remains at bottom of filler neck. Install radiator cap and check for leaks at all connections.
    ⚠Keep hands and tools clear of fan blades during warm-up procedure.

Reassembly

1. Reinstall hood if removed during preparation
2. Check transmission fluid level if automatic transmission equipped, as some ATF may have been lost during cooler line disconnection
3. Wipe down radiator exterior and engine bay to remove any spilled coolant
4. Verify all tools and shop rags have been removed from engine compartment

Verification

• Start engine and verify cooling fan engages when engine reaches operating temperature
• Inspect all hose connections and transmission cooler line fittings for coolant or ATF leaks
• Verify radiator cap is holding pressure by checking that upper radiator hose becomes firm when engine is at operating temperature
• Check coolant level in radiator after engine has fully cooled; top off if necessary
• Test drive vehicle and monitor temperature gauge to ensure engine maintains normal operating temperature under load
• Recheck coolant level after first drive cycle and top off as needed

More procedures for this vehicle