GM 12598644 Cooler Assembly, Charging Air

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The intercooler system must be completely free of air, or the system will not perform properly and the intercooler may become noisy. Begin by lifting the engine cover up, one side at a time, until it is free of the ball studs, then slide it forward and off the engine. Loosen the bleed screws at the top front corners of the supercharger manifold. Rotate the intercooler fill port fitting to the upright position, raising the hose slightly higher than the other intercooler components. Remove the cap and add a 50/50 coolant and water mixture to the fitting until coolant flows out of the bleeders, then tighten the bleeder screws. It is advisable to have plenty of rags or newspapers handy for mopping up coolant that comes out from the bleeder screws, and wearing rubber gloves while working with coolant is a good idea. After installing the cap, start the engine and let it run for one minute. Turn the engine off and allow the coolant in the fitting to stabilize for one minute, then remove the cap from the fitting. Add more 50/50 coolant mixture until the coolant level is near the top of the fitting, repeating the previous steps as necessary. Remove the cap and check for bubbles, waiting fifteen minutes and refilling as necessary before installing the cap. Continue this procedure until the coolant level within the fitting does not drop, and no more bubbles are present.

Remove any covering from the supercharger opening, install the gasket, followed by a new charge air cooler cover gasket. Then, install the charge air cooler cover and bolts, tightening them in sequence to the specified torque.