Today's Loren's Auto Repair auto maintenance article focuses on your serpentine belt. Your serpentine belt is a long belt that’s driven by your engine. It winds around several accessories that power important automotive systems. Let’s go over them.

First, the serpentine belt drives your Subaru air conditioning system. It spins the compressor that makes the cool air that takes the edge off the summer heat in Kalispell.

Next, the belt powers the alternator. The alternator creates electricity that’s used by your Subaru’s electrical systems and also charges your car battery. All Kalispell auto owners know that without the alternator, the battery will go dead in a few miles.

The serpentine belt may also run the pumps for both the power steering and power brakes. And, on many Subarus, the serpentine belt powers the water pump. The water pump circulates coolant through the engine to keep it within normal operating temperatures for Kalispell auto owners. (On some Subarus, the water pump is powered by the timing belt instead of the serpentine belt.)

So you can see the serpentine belt does a lot of work. And it if breaks, it affects a lot of systems. That’s why auto makers and your service advisor at Loren's Auto Repair have recommended that it be changed every so often so that it doesn’t fail.

Your Loren's Auto Repair service advisor can perform a visual inspection of the belt to see if it has any cracks that signal the belt could fail soon and will measure the amount of belt material to make sure there is enough.

Your serpentine belt works in tandem with a spring loaded pulley attached to the engine called the tensioner pulley. Its job is to make sure there’s a constant tension on the serpentine belt so that it doesn’t slip. The spring can become worn and no longer provide the necessary pressure to keep the belt tight. At Loren's Auto Repair, we recommend that the tensioner be replaced at the same time as the serpentine belt.

All in all, the serpentine belt’s a critical part for the function of your Subaru. And it’s not that expensive to replace at Loren's Auto Repair – so bring in your vehicle if it hasn't been checked in a while.