Step | Action | Value | Yes | No |
|---|---|---|---|---|
Definition: 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. | ||||
1 |
Is the blower noise constant at high blower speeds or certain modes but can be eliminated at lower speeds or in other modes? | -- | ||
2 | Test for motor and fan vibration at each blower speed by feeling the blower armature. Is the vibration excessive? | -- | ||
3 |
Did you find any foreign material at the blower orifice? | -- | ||
4 | Remove any foreign material from the orifice of the blower inlet. Is the procedure complete? | -- | System OK | -- |
5 |
Did you find any blower components faulty? | -- | ||
6 | Repair all of the blower components that show signs of excessive wear. Refer to Blower Motor and Fan Replacement . Is the procedure complete? | -- | System OK | -- |
7 |
Is the blower motor still noisy? | -- | System OK | |
8 |
Is the blower motor still noisy? | -- | System OK | |
9 | Reinstall the original motor. Is the installation complete? | -- | -- | |
10 |
Is the blower motor noisy in all modes and in all temperature positions? | -- | ||
11 |
Is the procedure complete? | -- | -- | |
12 | Is the blower motor noisy in all modes but not all temperature positions? | -- | ||
13 |
Is the procedure complete? | -- | -- | |
14 | Is the blower motor noisy in all temperature positions but not in all modes? | -- | -- | |
15 |
Is the procedure complete? | -- | -- | |
16 | Recheck the blower operation. Is the blower motor still noisy? | -- | System OK | |
