GM 19129799
Expansion Valve

After obtaining the refrigerant from the a/c system you can begin replacing the A/C Expansion Valve (TXV). The removal process begins with taking away both the i/p retainer and insulation material from the A/C Expansion Valve. Begin the procedure by first removing the hvac line clamp screw before taking away the hvac line clamp. Then unfasten the A/C Expansion Valve to Evaporator bolts followed by the A/C Expansion Valve line bracket. First disconnect and then carefully straighten out the A/C Expansion Valve from the Evaporator core before removing it from the a/c lines while disposing of all the o-rings. Start with o-ring application before attaching the a/c lines to the A/C Expansion Valve unit during installation tasks. Fix the A/C Expansion Valve onto the Evaporator core by using an A/C Expansion Valve line bracket for installation security. Begin by installing the hvac line clamp followed by securing the A/C Expansion Valve to Evaporator bolts at 3.5 n.m (31 lb in) while tightening the screw of the clamp to 1 n.m (9 lb in). The installation process ends with positioning insulation on lines and A/C Expansion Valve followed by the installation of the i/p retainer and evacuation of the system and conclusion of a leak test through the fittings by using the halogen leak detector (J 39400-A).

Remove the auxiliary evaporator from the auxiliary HVAC module.

Remove the TXV to evaporator bolts and the TXV line bracket.

Take out the auxiliary thermal expansion valve (TXV) assembly bolts and remove the auxiliary TXV from the auxiliary evaporator, discarding the O-rings.

Reattach the TXV line bracket and secure the TXV to evaporator bolts.

First, remove the auxiliary evaporator from the auxiliary HVAC module.