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3.
CAUTION: Use only the new O- ring seals. The use of any O-ring seals other than
those specified in the Ford Master Parts Catalog may result in intermittent leakage
during vehicle operation.
Install the O- ring seals.
z Lubricate the O- ring seals with PAG Refrigerant Compressor Oil (R- 134a Systems) or
equivalent.
4. Connect the spring lock coupling fittings with a twisting motion until the A/C tube lock coupling spring snaps over the flared end of the female fitting.
5. Install the A/C tube lock coupling clip. Klj . 5 ba
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GENERAL PROCEDURES
Heater Hose Coupling
Disconnect
CAUTION: Do not attempt to install a new bushing, spacer or O- rings in the heater hose
coupling; damage to the heater hose coupling can result. If the heater hose coupling is the
cause of a coolant leak, the affected heater hose must be replaced as an assembly.
1. WARNING: The engine must be off, fully cool and the cooling system fully
depressurized before attempting to disconnect any heater water hoses. Failure to comply
with this warning can result in serious injury or burns from hot liquid escaping out of the
engine cooling system.
Depressurize the engine cooling system.
2. Push the heater hose toward the tube to fully expose the locking tabs.
3. NOTE: When compressing the white coupling retainer with the special tool, the special tool
must be perpendicular to and on the highest point of the coupling.
NOTE: If the heater hose coupling is accessible, the retainer tabs can be compressed by hand
to disconnect the heater hose.
Push the special tool over the coupling retainer windows to compress the retainer locking tabs.
SECTION 412-
00: Climate Control System - General Information 2003 Mustang Workshop Manual Special Tool(s)
Remover, Heater Hose Inlet
Tube
412-
042 (T85T-18539- AH) Disconnect Tool, Heater Hose
412-
127
Material Item Specification
MERPOL®
—
ESE-
M99B144- B Klj . 1 ba
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4.
NOTE: A slight twisting motion while pulling on the heater water hose may be necessary to
assist in the removal.
Pull the heater hose away from the heater core tube.
5. Spread the retainer tabs apart and slide the retainer off the tube. zDiscard the retainer.
Connect 1. Clean the tubes and lubricate with coolant hose lubricant or plain water.
2. Install a new coupling retainer (18D434) into the heater hose coupling housing. Klj . 2 ba
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3. Push the heater hose coupling onto the tube.
4. Make sure the heater hose coupling is fully engaged by lightly pulling on the heater hose. Klj . 3 ba
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GENERAL PROCEDURES
Air Conditioning Line (Peanut) Fitting
Disconnect
1. CAUTION: Support the female fitting with a wrench to prevent the tubes from
twisting.
Remove the nut from the peanut fitting.
2. Pull the peanut fitting apart.
3. CAUTION: Do not use metal tools to remove the O- ring seal. They can cause axial
scratches across the O- ring seal groove, resulting in refrigerant leaks.
Remove the O- ring seal with a non- metallic tool.
SECTION 412-
00: Climate Control System - General Information 2003 Mustang Workshop Manual Klj . 1 ba
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Connect
1. Clean all dirt or foreign material from the fittings.
2. CAUTION: Use only the new O- ring seals. The use of any O-ring seals other than
those specified in the Ford Master Parts Catalog may result in intermittent leakage
during vehicle operation.
Install the O- ring seal.
z Lubricate the O- ring seal with PAG Refrigerant Compressor Oil (R- 134a Systems) F7AZ-
19589- DA (Motorcraft YN-12- C) or equivalent meeting Ford specification WSH-M1C231-
B.
3. Lubricate the inside of the fittings with PAG Refrigerant Compressor Oil (R- 134a Systems)
F7AZ- 19589- DA (Motorcraft YN-12- C) or equivalent meeting Ford specification WSH-M1C231-
B.
4. NOTE: When correctly assembled, the male and female fittings should be flush.
Assemble the male and female fittings together. Klj . 2 ba
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