AUTOMOTIVE TERMS ABBREVIATIONS
H-  Hydrogen

H2O-  Water

Harn-  Harness

HC-  Hydrocarbons

HCM-  HVAC Control Module

HD-  Heavy Duty

Hg-  Mercury

HO2S-  Heated Oxygen Sensor

hp-  Horsepower

HPV-  High Pressure Vapor

Htd-  Heated

HTR-  Heater

HUD-  Head Up Display

HVAC-  Heater Ventilation Air Conditioning

Hz-  Hertz