Heater blows cold on passenger side only

Good evening,

I posted the location of the blend door actuator for you.

https://www.2carpros.com/articles/replace-blend-door-motor

https://www.2carpros.com/articles/car-heater-not-working

I would remove it and move the door manually and see if you get heat.
If you do not then you most likely have a clogged heater core and have no circulation in part of the core.

https://www.2carpros.com/articles/replace-heater-core

Roy

I posted the directions below for the heater replacement.

Roy

Removal

Remove the climate control housing.
Refer to: Climate Control Housing (412-00 Climate Control System - General Information, Removal and Installation).
Remove the heater tube dash panel seal.
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Remove the retainers and the heater tube bracket.
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Remove the retainers and the vent tube.
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Detach the wiring clips, remove the retainers and the electric booster heater.
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Remove the retainer and the vent duct.
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Remove the retainer, heater core clip and the heater core.
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Installation

To install, reverse the removal procedure.

Heater core

412-00 Climate Control System - General Information 2015 Transit
Removal and Installation
Climate Control Housing
Base Part Number: 19B555
Special Tool(s) / General Equipment

Hose Clamp Remover/Installer
Materials

Name Specification
Motorcraft PAG Refrigerant Compressor Oil
YN-12-D WSH-M1C231-B
Removal

NOTE: Removal steps in this procedure may contain installation details.

Recover the refrigerant.
Refer to: Air Conditioning (A/C) System Recovery, Evacuation and Charging (412-00 Climate Control System - General Information, General Procedures).
NOTE: Make sure all openings are sealed.

Remove the evaporator line nut and flange, position the lines aside.
Torque : 133 lb. In (15 Nm)
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NOTE: 3.5L Ecoboost powertrain shown, other powertrains similar.

NOTE: Make sure all openings are sealed.

Clamp and disconnect the heater hoses.
Use the General Equipment: Hose Clamp Remover/Installer
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Remove both front doors.
Refer to: Front Door (501-03 Body Closures, Removal and Installation).
Remove the Instrument Panel Upper Section.
Refer to: Instrument Panel Upper Section (501-12 Instrument Panel and Console, Removal and Installation).
Remove the 2 screws, release the 2 retaining tabs and remove the center lower instrument panel finish panel.
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Remove the retainer and the drive side footwell vent duct.
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NOTICE: Do not allow the steering wheel to rotate while the steering column shaft is disconnected or damage to the clockspring may result. If there is evidence that the shaft has rotated, remove and recenter the clockspring.

Remove and discard the steering shaft pinch bolt and position aside the lower steering column shaft.
Torque : 21 lb. Ft (28 Nm)
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Remove the retainers and the lower steering column shroud.
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Disconnect the electrical connectors.
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NOTICE: The steering column is designed to absorb energy in a crash and must be handled carefully. The energy-absorbing steering column shaft cannot be subjected to force or impact shocks. Follow the removal procedure instructions carefully to avoid damage.

NOTE: Steering wheel shown removed for clarity.

Remove the steering column mounting nuts.
Torque : 177 lb. In (20 Nm)
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Disconnect the electrical connector.
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Disconnect and position aside the selector lever cable.
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Remove the bolt and disconnect the electrical connector.
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Remove the LH center insturment panel support bolt.
Torque : 119 lb. In (13.5 Nm)
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Remove the 4 bolts and the LH insturment panel lower support bracket.
Torque : 119 lb. In (13.5 Nm)
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Remove the 4 bolts and the RH insturment panel lower support bracket.
Torque : 119 lb. In (13.5 Nm)
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Remove the LH and RH A-piller bolt cover.
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Using a socket extension remove the LH and RH A-pillar bolts.
Torque : 119 lb. In (13.5 Nm)
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Release retainer and position aside harness.
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NOTE: Make sure that all electrical connectors and wiring are not hindered before removing the instrument panel or damage to the components may occur.

Remove the in-vehicle crossbeam assembly bolts.
Torque : 22 lb. Ft (30 Nm)
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Remove the retainers and the passenger side footwell vent duct.
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Disconnect the electrical connectors and position the wiring aside.
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Disconnect the electrical connectors and position the wiring aside.
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Disconnect the blower motor electrical connector and detach the wiring harness retainers.
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Remove the retainers and the climate control housing.
Torque : 89 lb. In (10 Nm)
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Installation

To install, reverse the removal procedure.
NOTICE: Only use the specified material to lubricate the seals.

Install new O-ring seals.
Material : Motorcraft PAG Refrigerant Compressor Oil / YN-12-D (WSH-M1C231-B)
Lubricate the refrigerant system with the correct amount of clean PAG oil.
Refer to: Refrigerant Oil Adding (412-00 Climate Control System - General Information, General Procedures).
Fill and bleed the cooling system. Refer to filling and bleeding without a vacuum cooling system filler.
Refer to: Cooling System Draining and Vacuum Filling (303-03A Engine Cooling - 3.5L EcoBoost (235kW/320PS), General Procedures).
Refer to: (303-03B Engine Cooling - 3.7L Duratec (199kW/270PS), General Procedures).
Refer to: (303-03C Engine Cooling - 3.2L Duratorq-TDCi (148kW/200PS) - Puma, General Procedures).

Okay, when you install the dash, does the dash push on the heater case or the blend door itself?

It has to be with the mounting of the dash against the heater case against the air ducts.

Roy