Check the activation and function of the various

Check the activation and function of the various actuators for the temperature control doors in the front heater and A/C unit. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function.
Check the measured values of the various temperature sensors. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function.
Check the foam seal on the heat core for the heater for the front heater and A/C unit. Refer to HEATER CORE, REMOVING AND INSTALLING .
On vehicles with an Auxiliary Heater Control Module -J604- (and an Auxiliary Heater Heating Element -Z35-) check the separation between the left and the right side in the front heater and A/C unit via the installation slot for the Auxiliary Heater Heating Element -Z35-. Refer to Auxiliary Heater Control Module .