GM 15735329
A/C Tube

The first step when replacing an auxiliary rear evaporator tube calls for complete recovery of refrigerant followed by vehicle elevation and support. Start the replacement by detaching the auxiliary evaporator rear outlet tube from its outlet side tubes and continuing with removing the auxiliary evaporator rear inlet tube from its inlet side tubes. The replacement process requires removing three bolts which secure the clips to the body and the nut holding the tube against the auxiliary evaporator module. Afterward, remove the tube from the auxiliary evaporator module and the seal washers. Begin tube installation with the seal washers and proceed by mounting the tube to the auxiliary evaporator module while tightening the nut to 25 N.m (18 lb ft). Fasten the retaining bolts for the body-tube clips before securing them with 4 N.m exertion (35 lb in) torque. First connect the auxiliary evaporator rear inlet tube with the auxiliary evaporator inlet side tube while tightening the nut to 27 N.m (20 lb ft) then proceed with the attachment of the auxiliary evaporator rear outlet tube with the auxiliary evaporator outlet side tube by tightening the nut to 47.5 N.m (35 lb ft). The vehicle should be lowered afterward for system evacuation and recharging together with a Halogen Leak Detector (J 39400-A) to inspect fittings for leaks at the repaired or reinstalled component.

To replace the auxiliary rear evaporator tube, first, recap the refrigerant from the system as well as raise and support the vehicle. It is to remove the auxiliary evaporator rear outlet tube from the auxiliary evaporator outlet side tubes and then the auxiliary evaporator rear inlet tube from the auxiliary evaporator inlet side tubes. Next, take out the bolts that hold the clips to the tubes to body and the nut holding the tube to the auxiliary evaporator module and remove the tube from the auxiliary evaporator module and the seal washers. For installation, first install the seal washers and then install the tube to the auxiliary evaporator module. Take the nut that secures tube to auxiliary evaporator module and tighten to 25 N.m (18lb ft) then take bolts that secure the clips on the tubs onto the body and tighten to 4 N.m (35 lb in). Next, secure the auxiliary evaporator rear inlet tube to the auxiliary evaporator inlet side tube with 27 N.m (20 lb ft) after which come the auxiliary evaporator rear outlet tube to the auxiliary evaporator outlet side tube with 47.5 N.m (35 lb ft). Lastly, bring the vehicle down, evacuate and recharge the system, and do a leak test on the fitting(s) of the repaired or replaced part with Halogen Leak Detector (J 39400-A).

Take out the bolts that secure the clips and remove the tube from the vehicle.

Detach the auxiliary evaporator outlet side tube from the compressor hose assembly along with its O-ring seal.

Detach the evaporator tube from the condenser and remove the O-ring seal.

Remove the grille.

Apply refrigerant oil to the new O-ring seal before connecting the auxiliary evaporator side inlet tube to the auxiliary evaporator rear tube, tightening the nut to 27 N.m (20 lb ft).

Remove the auxiliary evaporator front inlet tube from the evaporator inlet tube at the accumulator, followed by the O-ring seal.

Gather the necessary tools, including the Halogen Leak Detector (J 39400-A).

Remove the auxiliary evaporator outlet side tube from the rear tube and the O-ring seal.

Remove the auxiliary evaporator rear outlet tube from the auxiliary evaporator outlet side tubes and the auxiliary evaporator rear inlet tube from the auxiliary evaporator inlet side tubes.

Uncap or unplug all connections and install the compressor hose assembly to the vehicle.

Take off the grille and remove the evaporator tube from the condenser, followed by removing the O-ring seal.

Tighten the nut to 47.5 N.m (35 lb ft).