GM 52479881 Core,Heater

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To replace the heater core, begin by draining the cooling system. Then, disconnect the electrical connector and fluid tube from the windshield washer reservoir and remove the reservoir. This will allow access to the lower heater hose clamp. Loosen the inlet and outlet heater hose clamps and remove both hoses from the inlet and outlet pipes. Inside the vehicle, remove the heater core access cover. Next, remove the heater core retaining bracket bolts and the bracket itself. Pull out the old heater core from the heater module and install the new one. Secure the retaining bracket and install the heater core access cover, ensuring that the spring retaining clip is properly seated against the core. Slip the heater hoses onto the pipes of the new heater core and tighten the hose clamps securely. Reinstall the windshield washer reservoir, tightening the mounting bolts and connecting the electrical connector and fluid tube. Finally, start the engine, run the heater, and check for any leaks in the inlet and outlet pipe hose connections.