Noise Diagnosis - Heater System

Noise Diagnosis: YHA (Part 1 Of 2):

Noise Diagnosis: YHA (Part 2 Of 2):

Noise Diagnosis: YHA

A constant air rush noise is typical of all heater Systems when operating with the blower speed set to HIGH. Some systems and modes may be louder than others. If possible, check a similar vehicle to determine whether the noise is typical or excessive. Check all electrical connections and grounds for proper connections. If in doubt, use a voltmeter to check for constant voltage at the blower motor.