B4000 SE Regular Cab 4WD V6-4.0L OHV (1999)
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There are three O-ring seals required for the A/C condenser core couplings.
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There are two O-ring seals for all other refrigerant tube couplings.
CAUTION: Do not use a screwdriver or similar tool to remove the A/C tube lock coupling spring; this can cause axial scratches across the O-ring
grooves resulting in refrigerant leaks.
6. Remove the A/C tube lock coupling spring with a small hooked wire.
Cleaning
1. Fabricate a cleaning tool from a 118 inch diameter brazing rod.
2. Cut an abrasive pad with the dimensions corresponding to the coupling size.
3. Assemble the pad to the tool.
4. Coat the abrasive pad with R134a refrigerant oil.
5. Roll the pad on the tool and install it in a variable speed motor drill.
CAUTION: Maintain low speed drill rotation when inserting or removing the cleaning tool to prevent axial scratches which may cause future
leaks.
