OEM 2003 Chevrolet Monte Carlo Heater Core

2003 Chevrolet Monte Carlo Parts Questions & Experts Answers

• Q: How to replace the Heater Core on 2003 Chevrolet Monte Carlo?

  A: The required tool for heater core replacement is the Hose Clamp Pliers (J 38185). Proceed with sight shield removal of the fuel injector when the vehicle maintains the 3.8L engine configuration before draining coolant. The Hose Clamp Pliers (J 38185) should be used to disconnect the heater core inlet and outlet by clamping the heater hose clamps at the heater core while shifting them to the side. The replacement process requires discarding the vacuum tank then discarding the floor carpet and dislodging the rear floor air outlet duct from floor reinforcement holes before removing the duct from the heater core outlet cover. The vacuum harness bracket's bolts need to be removed before setting it aside. The heater outlet cover screws require removal for positioning the cover downward while moving it rearward until the connection can be separated from the rear area floor duct assembly. Remove heater core cover screws and heater core cover while discarding its seals (1,2), then pull the caulk off from the heater core outlet cover. You must first disconnect the heater core outer seal before proceeding to remove both heater core pipe retainer clamp screws and heater core retaining clamp screws to finally separate the retaining clamp and Heater core from the HVAC lower case. Extract the heater core pipe retainer clamp from the heater core pipes before discarding the heater core lower seal, center seal, upper seal and side seals from the HVAC lower case. Start heater core installation by inserting new side seals into the HVAC lower case before adding the upper seal and next placing the center seal and finally the lower seal . Secure the heater core in the HVAC lower case by applying the screw for retaining clamp retention and tightening it to 1.5 N.m (13 lb in). Install and tighten the heater core mounting clip with a screw according to the specified torque value. Begin by attaching the heater core outer seal to its position then mount new seals (1,2) to the heater core cover followed by applying caulk to the heater core outlet cover. Apply the heater core outlet cover with its screws and tighten both screws to 1.5 N.m (13 lb in). Then reattach the heater core cover and its screws by tightening them to 1.5 N.m (13 lb in). Secure the HVAC vacuum harness bracket along with its screws at 1.5 N.m (13 lb in) torque. The rear floor air outlet duct meets the heater core outlet cover before inserting the duct through the floor reinforcement holes while cleaning up the floor carpet and vacuum tank. The final installation requires attaching heater core inlet and outlet hoses to the heater core device using Hose Clamp Pliers (J 38185). You should also replace the 3.8L engine fuel injector sight shield before refilling cooling system coolant.