THIS TSB HAS BEEN SUPERSEDED OR DEACTIVATED

  
TECHNICAL SERVICE BULLETIN
2015-2019 Transit - 3.7L - Block Heater - Coolant Leak From The Thermostat Housing
21-2408
18 November 2021

Model:

Ford
2015-2019 Transit
Engine: 3.7L

Issue: Some 2015-2019 Transit vehicles equipped with a 3.7L engine and block heater may exhibit a repeat coolant leak from a deteriorated O-ring and/or intake manifold thermostat housing. This may be due to the block heater in the thermostat housing. To correct the condition, install a block heater service kit in the engine block.

Action: Follow the Service Procedure steps to correct the condition if the vehicle meets all of the following criteria:

• 2015-2019 Transit

• 3.7L engine

• Equipped with a block heater in the thermostat housing

• Coolant leak from thermostat housing

Parts

Service Part NumberPackage Order QuantityDescription
KK4Z-6D008-AKK4Z-6D008-A1Block Heater Service Kit
VC-13DL-GVC-13DL-GAs NeededMotorcraft® Yellow Concentrated Antifreeze/Coolant (All Markets Except Canada)
CVC-13DL-GCVC-13DL-GAs NeededMotorcraft® Yellow Concentrated Antifreeze/Coolant (Canada Only)

Quantity refers to the amount of the service part number required to repair the vehicle.

As Needed indicates the amount of the part may vary and/or is not a whole number. Parts can be billed out as non-whole numbers, including less than 1.

Parts - Parts To Inspect And Replace Only If Necessary

Service Part NumberPackage Order QuantityDescription
AT4Z-8527-AAT4Z-8527-AIf NeededThermostat Housing O-ring Seal
JL3Z-9424-BJL3Z-9424-BIf NeededLower Intake Manifold
BL3Z-8A586-GBL3Z-8A586-GIf NeededThermostat Housing
7T4Z-8590-A7T4Z-8590-AIf NeededO-ring Seal
AT4Z-9H486-AAT4Z-9H486-AIf NeededUpper Intake Manifold Gasket

If Needed indicates the part is not mandatory.

Warranty Status: Eligible under provisions of New Vehicle Limited Warranty (NVLW)/Service Part Warranty (SPW)/Service Part New Vehicle (SPNV)/Extended Service Plan (ESP) coverage. Limits/policies/prior approvals are not altered by a TSB. NVLW/SPW/SPNV/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.

Labor Times

DescriptionOperation No.Time
2015-2019 Transit 3.7L: Inspect And Install Immersion Block Heater Kit, Includes Time To Replace The Thermostat Housing And/Or Gasket As Necessary (Do Not Use With Any Other Labor Operations)212408A2.3 Hrs.
2015-2019 Transit 3.7L: Inspect And Install Immersion Block Heater Kit, Includes Time To Replace The Thermostat Housing And/Or Gasket And Intake Manifold Tube As Necessary (Do Not Use With Any Other Labor Operations)212408B3.3 Hrs.

Repair/Claim Coding

Causal Part:9J447
Condition Code:D8


Service Procedure

1. Remove the existing cooling system block heater and wire harness from the thermostat housing. Refer to Workshop Manual (WSM), Section 303-03A.

2. Remove the thermostat housing. Refer to WSM, Section 303-03A.

3. Inspect the thermostat housing, thermostat housing O-ring seal, and intake manifold tube for damage and replace as necessary. Refer to WSM, Section 303-03A.

4. Install the immersion block heater and harness kit. Refer to the instruction sheet included in the kit.

5. Fill and bleed the cooling system. Refer to WSM, Section 303-03A, General Procedures, Engine Cooling System Draining, Vacuum Filling and Bleeding.