Checking the Cooling
- Start the engine and set engine speed at 1500 rpm. Close the doors and windows.
- Turn on the air conditioner; set the controls at maximum cooling and blower speed.
- Allow the system to run for at least 10 minutes (longer on hot and humid days).
- Check air flow from the vents. If there is not enough air
flow, check the air intake vent for blockage and the blower motor
for proper operation.If the air flow is not cold enough, see General Information, Cummins ISB Series Engine of the Shuttle Bus Chassis Workshop Manual, or take the vehicle to an authorized Freightliner dealer.
- Carefully feel the system lines.
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The compressor discharge line should feel hot.
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The condenser inlet line should be noticeably warmer than the outlet line.
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The line from the condenser should feel warm.
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The inlet and outlet lines of the receiver-drier should be about the same temperature.
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The line from the receiver-drier to the evaporator should feel warm.
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The line from the evaporator to the compressor should feel cold.
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Important: When outside temperature and humidity are high it will take longer to cool the interior, especially if fresh-air vents are left open.
Note: Oily spots on the lines or at the fittings could indicate a system leak.