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HC stands for Hydrocarbon, a substance in your exhaust emissions. Smog and emissions tests measure the amount of HC that your car produces. High HC readings may indicate poor fuel ignition. The causes are numbered and varied. Anything from bad spark plugs or ignition wires to vacuum leaks because of a failed gasket can cause high HC readings and hinder your engine’s performance.


Headlights are the lamps attached to the front end of your car that illuminate the road when you are driving in the dark. All cars come equipped with halogen headlights, higher-end models often times feature xenon or LED lights instead. As with any kind of lights, headlights burn out over time and need to be replaced.


The Heater is what blows hot air into the cabin of your car to keep you warm when it’s cold outside. If your heater is not working, you may have any of the following problems: a broken heater blower motor, low coolant level, broken thermostat, a bad fuse, or a loose or broken hose.

Heater Hose

The Heater Hose transfers heat coming off the engine into a heater core beneath your dash. If the hose is broken, the heater core won’t contain the necessary heat needed to blow warm air through the vents of your car.


The Hub is the bearing that the wheel is attached to. If you hub is bad, your wheels will vibrate and become loose, which seriously impacts your car’s safety and performance.


HVAC stands for heating-ventilation-air conditioning. This is your car’s climate control system. Though connected, the HVAC system performs operations independently. That means, you could have a broken air-conditioner, but the heater still works fine—or vice versa.

Hybrid Engine

A Hybrid Engine combines two different energy sources. Most hybrid vehicles today contain both an electric engine and a conventional gasoline powered engine. Hybrid engines typically have better gas mileage and produce fewer emissions.

Hydraulic System

Hydraulics operate many systems within your car, from the clutch to the brakes to the suspension. Hydraulic systems work by applying force using an incompressible fluid a.k.a. hydraulic fluid. If these systems leak hydraulic fluid from a breach, the fluid can damage other parts of the car and cause the system its supposed to be lubricating to function poorly.


When your car loses tire traction and skids from too much water on the road, you are hydroplaning. You can help avoid hydroplaning by making sure your tires are properly inflated and have good tread on them. Also, drive slower when it’s raining or the road is wet, stay away from puddles, and avoid driving in outer lanes where water tends to accumulate.