At Harold's Used Auto Parts Inc in Philadelphia, we’re not only here to fix your car when something goes wrong...we’re here to help you understand your car, truck, or SUV a little better, too. Here are some tips concerning your thermostat - how it works, what to watch out for, and what to do about it when one fails.

Fleet operators know that a day’s work can burn through a lot of fuel. When it comes to multiple vehicles, even a slight change in the way vehicles are used can make a huge difference towards saving fuel, and money as a result. Whether you manage diesel trucks, fleet cars, or both, a little bit of effort can sometimes go a long way.Harold's Used Auto Parts Inc in Philadelphia, PA has a few tips you can use to keep fuel consumption low, that you may be interested in implementing throughout your fleet.

Have you always wondered what a spark plug does? Our team here at Harold's Used Auto Parts Inc is here to help you out. It's simple in theory but does quite a lot of work for such a small piece of equipment. Your spark plug forces electricity to arc across a gap like a bolt of lightning at high voltage and fits into your engine's cylinder head, where it “sparks” to ignite the fuel and creates combustion within your engine. Without it, you wouldn't be able to drive your car or truck. 

At Harold's Used Auto Parts Inc in Philadelphia, routine maintenance and repair isn’t the only thing we do. For custom parts installation, you can also count on us. Common modification enthusiasts do is swapping to a short-throw shifter; but what actually is a short-throw shifter, and what does it do?

If you own or maintain a fleet or commercial truck, you are likely already familiar with the term ASE certified technician. But what does ASE mean, and why is it important? Harold's Used Auto Parts Inc in Philadelphia, PA has the answer.

At Harold's Used Auto Parts Inc in Philadelphia, we know that few problems are simultaneously as simple and confusing as a bad ground connection on your car, truck, or SUV. Here’s a look at some symptoms of a bad ground, and what you can do to correct it.

At Harold's Used Auto Parts Inc in Philadelphia, PA, we believe it’s important for you to know how different systems in your car, truck, or SUV operate. Whether you want to know what to watch out for, or you’re just curious about how things work, we’re here to supply the answers.

Unless you use your vehicle to tow every day for work, odds are you haven’t paid much attention to your truck, SUV, or crossover’s towing capacity. Maybe you’re looking to buy a boat for some summer fun or just need to rent a trailer to get your belongings from one dwelling to the next. Whatever the reason for pulling something behind your vehicle, it’s important to get a firm grasp on what exactly your towing capacity means. Understanding how each of the components in your vehicle contributes to your overall tow rating can keep you from putting undue stress on your rig and keep you and your family safe.

If you drive a lightweight car, truck, or SUV, the torque converter you have installed is probably just fine. For those of you with more heavy-duty applications, like high horsepower setups or towing rigs, the stock converter may not be enough. At Harold's Used Auto Parts Inc in Philadelphia, PA, we can help with that.