OEM Buick LaCrosse Heater Core

Buick LaCrosse Heater Core Parts Questions & Experts Answers

• Heater Core
  89018289
  Q: How to Service and Repair the Heater Core on Buick LaCrosse?

  A: One must drain the coolant as the first step of heater core replacement. The Hose Clamp Pliers (J 38185) should be used to set aside clamps of the heater hose inlet and outlet before disconnecting the hookup between the heater core and hoses. The first step involves removing RH and LH instrument panel closeout/insulator panels together with floor carpet and communication interface module. Use Hose Clamp Pliers (J 38185) to transition the floor air outlet duct away from the floor reinforcement holes before cutting it free from the heater core outlet cover. To proceed you should remove the heater core outlet cover screws with heat stakes using a small chisel before taking off the outlet cover from the HVAC module assembly. First prepare the heater core cover by removing screws and heat stakes with a small chisel then take off the cover from the HVAC module assembly. Move the heater core as well as its foam seal outside the HVAC module assembly. The installation process requires addition of a new heater core foam seal to the HVAC module assembly before heater core installation. Install the heater core cover by drilling the dimples around its heat stakes using a 5.5 mm (7/32 in) drill bit and then tighten its screws to 1.5 N.m (13 lb in). Reuse the procedure to install the heater core outlet cover screws by tightening them to 1.5 N.m torque (13 lb in.). The rear air duct should be reattached from the heater core outlet to the floor reinforcement holes where it will be installed. The technician reattaches the communication interface module followed by the floor carpet and insulator panels for both sides of the instrument panel. You should link heater core inlet and outlet hoses and tighten their clamps with Hose Clamp Pliers (J 38185) before performing coolant refill.