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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3304
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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I have a 2006 freightliner Columbia just replace the

Customer Question

I have a 2006 freightliner Columbia just replace the compressor and dryer wh we n I turn on the ac the fan stay on and a day after the compressor clutch just start spin and stop ... can you help,me
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

Spanky is not available at the moment. I can assist you if you like?

Can you please explain a bit more of what you did when you replaced the A/C compressor? Why was the compressor changed? Was the system checked for leaks with dye? Was the system vacuumed and charged to spec? Has the system been checked for leaks since the compressor is not cycling? Have you hooked up any gauges to get the readings of the refrigerant levels?

I ask because compressor cycling is a good indicator of either a leak in the system causing the refrigerant level to get too low or the expansion valve being bad and causing the system to freeze up at the evaporator.

The fan being on constant is a good indicator of air in the system causing the pressure to read to high on the high pressure switch or the switch is bad or a bad expansion valve or the temps are just really high outside.

When the compressor was changed, was the entire system flushed? Was the expansion valve and the drier changed? These items should be changed with every single compressor change for the job to be done right. Was the condenser changed? (Note, on a R134 system, if compressor failed and metal got into the system, the condenser must always be changed or it will cause a high head pressure issue and failed/cycling compressor)

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touch, smell, hear, or taste the vehicle/machine in question. Please provide as much detail as possible and I will provide as much back.

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