Semi Truck Air System Troubleshooting

Typical 6 wheel air brake system.

Semi truck air system troubleshooting.

These diagrams are provided for basic identification only. And suddenly you notice the inside of your cab getting hotter. Freightliner ac systems are much larger than most vehicle systems and they use a larger condenser and an air compressor to cool the air. Heavy duty truck parts distributor specializing in aftermarket parts for the owner operator.

Formats and describe the operation and troubleshooting of air brake components and systems. If the vehicle is equipped with an ad is air dryer system or a dryer reservoir module be sure to drain the purge reservoir. Other common problems with air brake compressors. Additional air brake system information bendix audiovisual programs bendix offers several audiovisual programs on many bendix air brake devices and systems.

Check the belt periodically to make sure it s in good shape. Always consult a professional technician to properly troubleshoot your system. A c parts under the hood. Low air pressure in the brake system below 60 psi brake valve delivery pressure below normal wrong size actuators and or slack adjusters failure of part of a dual air system if remote mounted brake valve check linkage.

System valves and brake lines as you ll remember we said air brakes have a series of valves throughout the system that help regulate the air flow and keep air in the supply tanks. A drive belt makes your truck s air conditioning compressor turn which keeps the cooling refrigerant circulating through the system when the belt is worn stretched or cracked it can slip or break stopping the compressor and shutting down the a c. If coolant is present inside the reservoir tank check the compressor cooling system to identify and repair the problem. If the system builds air with the dryer bypassed rebuild or replace the dryer.

If the work is being performed on the vehicle s air brake system or any auxiliary pressurized air systems make certain to drain the air pressure from all reservoirs before beginning any work on the vehicle. For more information on issues you may be experiencing in your engine check out our past blog common diesel engine problems. A more detailed look at the air braking system in particular with this video at the air brake relay. But in the meantime let s talk about what may be causing the need for ac repair.

It s the middle of summer. Typical 10 wheel brake system. The easiest way to test the air dryer is to bypass it. 2 brakes apply too slowly brakes need adjusting or lubricating low air pressure in the brake system below 60 psi.

Your semi truck ac is still blowing but the air isn t cold. The most common problem with a. An evaporator is used on freightliner trucks as a heat exchange medium to move the heat generated by the system away from the air conditioning unit. Relays are fitted to an air braking system for larger v.