3.7L – Block Heater – Coolant Leak From The Thermostat Housing – 2015-2019 Ford Transit

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TECHNICAL SERVICE BULLETIN
2015-2019 Transit – 3.7L – Block Heater – Coolant Leak From The Thermostat Housing
21-2408
18 November2021
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 Number
Quantity
Description
KK4Z-6D008-A
1
Block Heater Service Kit
VC-13DL-G
As Needed
Motorcraft® Yellow Concentrated Antifreeze/Coolant (All Markets Except Canada)
CVC-13DL-G
AsNeeded
Motorcraft® 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 Number
Quantity
Description
AT4Z-8527-A
If Needed
Thermostat Housing O-ring Seal
JL3Z-9424-B
If Needed
Lower Intake Manifold
BL3Z-8A586-G
If Needed
Thermostat Housing
7T4Z-8590-A
If Needed
O-ring Seal
AT4Z-9H486-A
If Needed
Upper 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)/Special Service Part (SSP)/Extended Service Plan (ESP) coverage. Limits/policies/prior approvals are not altered by a TSB. NVLW/SPW/SSP/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.
Labor Times
Description
Operation
Time
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No.
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)
212408A
2.3Hrs.
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)
212408B
3.3Hrs.
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.

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