Troubleshooting A/C Problems in Freightliner Trucks

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Freightliner AC systems are much larger than most vehicle systems, and they use a larger condenser and an air compressor to cool the air. 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. The most common problem with a freightliner AC system is a leaking compressor. A specially trained mechanic should fix any problems with the AC system, but you can troubleshoot to verify that there is a problem

Turn the fan speed on low and turn the AC to the coldest setting. Freightliners use a simple dial on the HVAC control unit to control the setting of the AC system. On a freightliner, the sound of the compressor starting is unmistakable. You should hear a low "hum" followed immediately by the cooling fan turning on. If you do not hear the compressor, it may have failed or is leaking. Either of these two scenarios will require that the compressor be replaced.

Freightliner trucks normally have a water temp gauge in the center of the dash-making it easy to know when your truck's engine is warm.

The reason for failure on freightliners is almost always a leak in the compressor due to a failure at the cooling line to air compressor seal. This, in turn, causes the compressor motor to continue running while coolant leaks out of the system. Because the compressor needs refrigerant to operate safely.

The motor ends up burning out and failing at some point.If you think the AC system on your freightliner truck needs to be recharged, don't'use the unit until you have the system recharged because it could cause a critical failure of the compressor.

Driving an autoshift Freightliner is similar to operating any vehicle with an automatic transmission. Eaton developed the heavy-duty automatic for long haul drivers to help ease the burden of shifting through all the gears. The autoshift was standard in medium-duty trucks for many years, but as technology increased so did the need for making life on the road easier for the weary driver. The truck will shift through the gears by itself. Downshift as you would a regular automatic to help with pulling through grades or driving through rough weather
You are required to be a licensed operator for this equipment before taking it on the road.

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Source by Daryn Duff

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