this issue just came to my attention, do you think something along the lines of zerex g-05 would be an acceptable solution? TECHNICAL SERVICE BULLETIN 3.5/3.7L - Lack Of Heat Or Uneven Heat From Front Vents 18-2172 18 June 2018 Model: Ford 2015-2018 Transit Issue: Some 2015-2018 Transit vehicles equipped with a 3.5L or 3.7L engine may exhibit a lack of heat or uneven heat from side to side. This condition may be due to deposits from the engine coolant trapped in the heater core. Action: Follow the Service Procedure steps to correct the condition. Parts Part Number Description Quantity VC-1 MotorcraftÂ® Premium Cooling System Flush 1 YN-12-D MotorcraftÂ® PAG Refrigerant Compressor Oil 1 BR3Z-8255-A Thermostat O-Ring Seal 1 6103599 Left A-Pillar Trim Panel - Refer To The Parts Catalogue For The VIN Specific Application 1 CK4Z-18476-A Heater Core 1 6E5Z-19B596- A A/C Evaporator O-Ring Kit 1 FPS-8262 Authorized Modification Label 1 Obtain Locally PrestoneÂ® Cor-Guardâ„¢ Coolant 1 Obtain Locally Distilled Water 1 Warranty Status: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage Warranty/ESP coverage limits/policies/prior approvals are not altered by a TSB. Warranty/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool. Labor Times Description Operation No. Time 2015-2018 Transit 3.5L/3.7L: Diagnose And Flush The Cooling System Includes Time To Replace The Heater Core (Do Not Use With Any Other Labor Operations) 182172A 9.3 Hrs. Repair/Claim Coding Causal Part: 18472 Condition Code: 49 Drive Tool Name 1/4" Power Tool 1/4" Ratchet 1/4" Long Handle Ratchet 1/4" Torque Wrench 1/4" 6" Extension Drive Tool Name 1/4" 8" Extension 1/4" Universal Joint 1/4" 10 mm Deep Socket 1/4" TorxÂ® T20 1/4" TorxÂ® T27 1/4" 7 mm Socket 1/4" 8 mm Socket 1/4" 10 mm Socket 1/4" 13 mm Socket 3/8" Ratchet 3/8" Torque Wrench 3/8" 6" Extension 3/8" 10" Extension 3/8" 13 mm Deep Socket 3/8" 15 mm Deep Socket 3/8" 19 mm Deep Socket 3/8" 13 mm Socket 3/8" 15 mm Socket 3/8" Hex #4 3/8" TorxÂ® T40 3/8" 13 mm Crows Foot 3/8" 19 mm Crows Foot 3/8" 13 mm Swivel Socket Medium Flathead Screwdriver Pocket Flathead Screwdriver 19 mm Wrench 13 mm Flex Head Ratchet Wrench 10 mm Flex Head Ratchet Wrench Plastic Trim Tool Metal Trim Tool Hose Pinch-Off Pliers, 2 Pair Service Procedure 1. Run the engine until it reaches normal operating temperature. Does the vehicle exhibit a lack of heat or uneven heat from the vents in the instrument panel? (1). Yes - proceed to Step 2. (2). No - this article does not apply. Refer to Workshop Manual (WSM), Section 412-00. 2. Select the floor position on the control assembly. Set the temperature control to full warm and the fan speed to medium setting. 3. Increase the engine speed to 3,500 revolutions per minute (RPM). After 30 seconds, allow the engine to return to idle for an additional 30 seconds. 4. Using a suitable temperature measuring device, check the heater core inlet hose temperature. Is the heater core inlet hose above 66Â°C (150Â°F)? (1). Yes - proceed to Step 5. (2). No - this article does not apply. Refer to WSM, Section 412-00. 5. Measure the heater core inlet and outlet hose temperature. Are the hose temperatures within 6-17Â°C (10-30Â°F)? (1). Yes - this article does not apply. Refer to WSM, Section 412-00. (2). No - proceed to Step 6. 6. Drain the engine coolant. Refer to WSM, Section 303-03. 7. Remove the coolant hoses from the transmission fluid cooler. Refer to WSM, Section 307-02. 8. Remove the thermostat. Refer to WSM, Section 303-03. 9. Disconnect lower radiator hose. 10. Using a garden hose, run water through inlet and outlet radiator hoses for 2 minutes each. 11. Reassemble the thermostat housing without the thermostat installed. Do not reconnect radiator hoses to the housing at this time. 12. Using a garden hose, run water in the degas bottle for 2 minutes. 13. Close the radiator drain valve. 14. Reattach the coolant hoses to the transmission fluid cooler. 15. Disconnect the inlet and outlet heater hoses from heater core. Refer to WSM, Section 412-00. 16. Using a garden hose, run water through inlet and outlet heater hoses back toward the engine for 5 minutes each. 17. Reattach all hoses except for inlet and outlet heater hoses. 18. Using pinch pliers, clamp off inlet and outlet heater hoses. 19. Add 1 bottle of MotorcraftÂ® Premium Cooling System Flush and fill the rest of the cooling system with water. 20. Connect the appropriate Ford scan tool to the vehicle and start the engine. 21. Allow the engine to reach normal operating temperature. 22. Run the engine at 2500 RPM for 15 minutes with the climate control system off. 23. Return the engine to idle. Using the Ford scan tool, command the cooling fans on high speed for 5 minutes. 24. Turn the engine off and open the degas bottle cap. (1). Caution: Water may be hot. Refer to WSM, Section 303-03. 25. Drain the cooling system. Refer to WSM, Section 303-03. 26. Remove the coolant hoses from the transmission fluid cooler. 27. Using a garden hose, run water through the degas bottle at the cap opening for 2 minutes. 28. Close the radiator drain valve. 29. Reattach the coolant hoses to the transmission fluid cooler. 30. Fill the cooling system with water. Refer to WSM, Section 303-03. 31. Repeat Steps 20 through 27. 32. Remove the pinch pliers from the inlet and outlet heater core hoses and backflush toward the engine with a garden hose for 1 minute each. 33. Using a garden hose, flush the transmission fluid cooler coolant inlet and outlet with water for 1 minute each. 34. Using a garden hose, run water through the degas bottle at the cap opening for 2 minutes. 35. If equipped, disconnect the coolant hoses from the engine oil cooler and flush the inlet and outlet ports of the cooler with water for 1 minute each. Reconnect the hoses. Refer to WSM, Section 303-01. 36. Remove the plug from the left side of the engine block to aid with cooling system drainage. (Figure 1) Figure 1 37. Reinstall the block plug and close the radiator drain. 38. Install the thermostat. Refer to WSM, Section 303-03. 39. Reconnect the coolant hoses to the transmission fluid cooler. 40. If equipped, disconnect and backflush all rear heater components and hoses with a garden hose for 2 minutes. 41. Replace the heater core. Clean the heater core inlet and outlet metal tubes with hot water until free of deposits. Refer to WSM, Section 412-00. 42. Fill the cooling system. Refer to WSM, Section 303-03 to determine correct coolant concentration based on the climate. 43. Fill out FPS-8262 Authorized Modification Label with the following text: "Use Only PrestoneÂ® Cor-Guardâ„¢ Coolant" 44. Clean the coolant reservoir surface with isopropyl alcohol and apply the FPS-8262 Authorized Modification Label. (1). Note: Advise the owner or driver that the unit will be using a different PrestoneÂ® Cor-Guardâ„¢ coolant for the environmental conditions. Also, highlight the technician comments describing the coolant used on the customer's copy of the repair order. Â© 2018 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.