TSB 21-2408

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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
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
As
Needed
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 nonwhole 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
7T4Z-8590-A
AT4Z-9H486-A
If Needed Thermostat Housing
If Needed O-ring Seal
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
2.3
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)
212408B
3.3
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.
© 2021 Ford Motor Company
All rights reserved.
NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and
equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information
that could assist in proper vehicle service. The procedures should not be performed by "do-it-yourselfers". Do not assume that a condition
described affects your car or truck. Contact a Ford or Lincoln dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy
and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article.
The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supersede
this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources.
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