GMW GMW8464: Issue 3; English; GMW RESTRICTED/CONFIDENTIAL STANDARD – To purchase call 1-800-854-7179 USA/Canada or 303-397-7956 Worldwide
SDO: GMW: General Motors Company
DOD Adopted ANSI Approved Approved
Note: Nothing in this standard supercedes applicable laws and regulations.
Note: In the event of conflict between the English and domestic language, the English language shall take precedence.
Purpose. This procedure describes the process for evaluating and measuring vehicle level noise and vibration (N&V) generated by Heating, Ventilation, and Air Conditioning (HVAC) blowers.
Foreword. This procedure is used to assess noise and vibration performance of heating and ventilation blowers at the vehicle level such as heater blowers, front and rear air conditioning (AC) blowers, window defogging blowers and radio cooling blowers.
Because blower noise emission is dependent on blower airflow rate, airflow measurements are a necessary part of an objective assessment of blower noise. Airflow rate is especially important when evaluating multiple blowers. Blower noise levels from multiple blowers can be compared by relating blower noise levels to airflow rates.
Applicability. This procedure is applicable for all passenger cars, multi-purpose passenger vehicles, minibuses, and light commercial vehicles with a heating or air conditioning system.
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