GM 52494507
Evaporator Core

The first step for evaporator core replacement is to remove the HVAC module assembly with every outer seal. First detach the recirculation housing from the HVAC module assembly before you release the retaining clip for the defroster actuator to remove the actuator. The next step requires removal of upper screws that secure the HVAC module assembly case which can be separated thereafter. A technician must remove the HVAC module assembly seal from the lower module case then extract both the evaporator core and water core filter from the evaporator unit. Consumers must apply refrigerant oil to the system according to its capacity specifications during new evaporator installation. The water core filter needs installation onto the evaporator which must be accompanied by new side seals accompanied by upper and two lower seals for the evaporator core. Attach the HVAC module assembly seal to the lower module case while inserting the evaporator core inside the case. The guide should be aligned before securing the upper and lower HVAC module assembly case through upper screws tightened to 1.5 N.m (13 lb in). Fasten the defroster actuator before connecting the recirculation housing to the HVAC module assembly through screws that need tightening to 1.5 N.m (13 lb in). The final task requires reinstallation of the HVAC module assembly.

Starting the replacement of the evaporator core requires the HVAC module assembly removal and complete sealing components. The next step requires separating the recirculation housing from the HVAC module assembly after unclipping the defroster actuator retaining clip to remove the actuator. You must unscrew the upper screws of the HVAC module assembly case to separate it. The user should remove both the lower module case seal and the HVAC module assembly seal before extracting the evaporator core with its accompanying water core filter. Install new upper seals together with a new side seal as well as the water core filter onto the evaporator core when replacing it with refrigerant oil. The HVAC module assembly seal needs to be installed onto the lower module case before placing the evaporator core inside the lower case. Foot of the guide touches its position and the upper and lower HVAC module assembly case joins along with proper 1.5 N.m (13 lb in) torque on upper screws. After assembly of the HVAC module, the installer should first secure the defroster actuator then install the recirculation housing by tightening the screws to 1.5 N.m (13 lb in) before completing the installation.

The first step begins with HVAC module assembly removal then continuing to remove all outer seals of the HVAC module assembly before moving forward. The removal process starts with releasing the retaining clip that holds the defroster actuator. Afterward, detach the recirculation housing from the HVAC module assembly and remove the actuator. Detach the HVAC module assembly case by removing all upper screws. You should first remove the HVAC module assembly seal from the lower module case followed by extracting the evaporator core which contains the water core filter from the evaporator. To install begin by connecting the water core filter to the evaporator before applying new side and upper seals with two new lower seals for the evaporator core. The HVAC module assembly seal should be installed on the lower module case before inserting the evaporator core which must align with the guide prior to upper and lower case installation. Secure the upper screws of the HVAC module assembly and tighten them to 1.5 N.m (13 lb in). Attach the defroster actuator followed by the recirculation housing screws then replace the HVAC module assembly while tightness should be at 1.5 N.m (13 lb in) for screws.

A replacement of the air conditioning evaporator core begins with removing the HVAC module assembly as well as all outer seals. Extract the recirculation housing then free the retaining clip of the defroster actuator to proceed with the actuator removal. Drilling the upper screws from the HVAC module assembly case allows you to split the case apart. Extract the evaporator core together with the water core filter after removing the HVAC module assembly seal from the lower module case. The water core filter installation begins by connecting it to the evaporator before applying new side, upper and two lower seals onto the evaporator core. Insert the HVAC module assembly seal into the lower module case before setting the evaporator core inside the lower case. The guide should be aligned before fastening the upper and lower parts of the HVAC module assembly case while utilizing the appropriate fasteners in their correct locations according to specifications. Paints and lubricants together with corrosion inhibitors should never be applied to fasteners since these substances affect clamping force and torque values. Always apply correct tightening sequences together with specifications to minimize any potential damage. The HVAC module assembly procedure ends after installing its upper screws at 1.5 Nm (13 lb in) and reattaching the defroster actuator and recirculation housing with its screws torqued equally before finishing installation.

Service and maintenance of the evaporator core begins with HVAC module assembly removal followed by all outer seals from the HVAC module assembly. The recirculation housing should be separated from the HVAC module assembly before unfastening the retaining clip that secures the defroster actuator. Finally, the actuator can be removed. First detach the HVAC module assembly case through removal of its upper screws before splitting apart the case. Extract the evaporator core with attached water core filter from inside the evaporator by first removing the HVAC module assembly seal from the lower module case. To install begin by attaching the water core filter onto the evaporator followed by adding new side seal and upper seal and two new lower seals to the evaporator core. Attach the HVAC module assembly seal to the lower module case then position the evaporator core into its place in the HVAC module assembly lower case by lining up the guide before fastening both pieces of the case. Screw and tighten the two upper screws of the HVAC module assembly to 1.5 N.m (13 lb in). After replacement of the defroster actuator and the recirculation housing the technician must reinstall the HVAC module assembly following a torque schedule of 1.5 N.m (13 lb in) for its housing screws.

The first step in changing the Evaporator core of the auxiliary hvac system requires users to remove the rear heater a/c module and the thermal expansion valve and the air distribution valve vacuum actuator. The first step requires uninstalling the hvac module base cover screws before carefully extracting the base cover. The hvac-module case halves should be separated with caution to protect the heater core cooling fins while you lift out the Evaporator core from the module half. Place the new insulator/seal on the Evaporator core before inserting it into the hvac module case while making sure the pipe seal matches the grooves of the case halves. Fasten the hvac module case halves together by driving in the screws until they reach 1.6 n.m (14 lb in). Install the hvac base cover followed by securing retaining screws that should be tightened to 1.6 n.m (14 lb in). The vacuum actuator alongside the thermal expansion valve and the rear heater a/c module must be reinstalled last.

Align the retaining clip and install the upper and lower HVAC module case, ensuring to tighten the HVAC module case screws to 1.5 N.m (13 lb in).

First attach the water core filter to the evaporator, followed by new side, upper, and two lower seals to the evaporator core.

Install the evaporator core into the lower HVAC module case and add new case seals, starting with the primary seal.

Align and secure the upper HVAC module case to the lower case, then install and tighten the retaining screws to 1.6 N.m (14 lb in).

Add 90 ml (3 oz) of refrigerant oil to it, then install a new water core filter, a new side seal aligned with the corners, a new upper seal, and two new lower seals at the outer corners of the evaporator core.

Install the evaporator core into the HVAC module case - lower and add new case seals, starting with the HVAC module case primary seal.

Unscrew the upper screws of the HVAC module assembly case and separate the case.

Discard the lower, upper, and side seals of the evaporator core, as well as the water core filter.

Inspect the retaining tab; if damaged, install an external retaining clip (P/N 52458793, or equivalent).