Auto air conditioning compressor Show
What causes an air compressor to lock up?
Analysis of Denso
A/C Compressor warranty claims shows that in a quarter of all cases Excessively high temperature and�lack of lubrication�are the biggest enemies of any automotive a/c compressor bearings. Slipping compressor clutches can generate�temperatures as high as 1,200 degrees Fahrenheit; this tremendous amount of heat will quickly melt down the bearing seal. The bearing loses its grease and in the process, before it locks up completely it gets rough and noisy. �Seal could cause the compressor oil to finds it way into the hvac compressor clutch bearing contaminating the grease. The properties of the bearing grease will be changed by this oil contamination causing it a poor compressor bearing lubrication and inevitably internal bearing failure. Leaking air conditioning systems�will leak out refrigerant and the oil that resides inside of the compressor creating a huge frictional resistance between the compressor piston and the cylinder leading to an increase in compressor internal temperature Overcharged or improperly vacuumed auto ac systems will create high system pressures and therefore high temperatures. Compressor pressure plate and rotor pulley excessive air gap will cause slippage and rise in temperature. A dirty evaporator will cause the suction pressure to drop. When the suction pressure goes below normal, the vapor that the compressor is pumping becomes les dense and gets thin (sometimes called rarified vapor).The compressor performance declines. Low suction pressures also cause the high-pressure gases caught in the clearance volume of the compressor to expand more during the piston�s downstroke.This gives the compressor a lower volumetric efficiency. These gases have to expand to a pressure just below the suction pressure before the suction valve will open. Because more of the downward stroke is used for expansion, less of the stroke can be used for suction. Suction ends when the piston reaches bottom dead center. How to save my auto air conditioning compressor?A/C performance test
This easy test will give you a general guideline to compare against your car�s a/c operation. (This test was specifically performed on a BMW model). Switch on air conditioning compressor with A/C button at a vehicle interior of 45 �C /113 �F (measure at the head restraint) On vehicles with MAX-AC button:
On vehicles without MAX-AC button:
How to find an automotive compressor problem, before is too late?
Compression ratios are used to compare pumping conditions for a compressor. When compression ratios become too high, the refrigerant gas temperature leaving the compressor rises to the point that oil for lubrication may become overheated. Overheated oil may turn to carbon and create acid in the system shortening the life of the Automotive A/C system. R-134a
Calculation: � Compression ratio =�Absolute Discharge ���������������� ������������Absolute Suction CR=�250 psig + 14.7 atmosphere ������� 45 psig + 14.7 atmospheres CR =�264.7 59.7 CR = 4.43:1 � A compression ratio of 4.43:1 would indicate to a service technician that the absolute or true discharge pressure is 4.43 times as great as the absolute suction pressure. Either an increase in head pressure or a decrease in suction pressure will cause higher compression ratios. Symptoms of a Bad or Failing AC Compressor
Serpentine belt problems usually result from one of these causes: a defective belt tensioner, misalignment of a pulley or defective bearings of any component of the drive system.�Worn out drive system belts lead to poor�hvac compressor output performance. Can compressor be repaired?
The air compressor may be remanufactured or rebuilt. The price range for labor only is $285.00 to $500.00.This is an option many people choose, because of the price difference between a new compressor and a rebuilt one. What happens if a compressor fails?
The first sign will be no cold air coming out from the vents. 1-Clicking sound from under the engine. (Compressor
clutch engaging and disengaging) When a compressor begins to have an internal failure. It often releases debris into the A/C system. The debris created can be metal or Teflon. Metal
debris can be created from any metal component inside the compressor sefl-desctructing, and Teflon can come from the Teflon seals on the compressor pistons. When debris becomes trapped against the seal, it will damage it and pieces of the seal break apart and travel throughout the A/C system. After a catastrophic compressor failure the system must be
flushed, otherwise the new air conditioning compressor could get damaged by all the debris released by the old locked up a/c compressor. When the A/C system flushing is complete:
Why did my compressor stop working?
What happens if AC compressor locked up?If your compressor seizes or gets locked up, it can sometimes be mechanically freed to get your unit cooling again right away. Soon the compressor may fail again or sometimes it will chug along for a good while which buys you a little time to stop sweating and make a plan to replace it.
Can you drive with a locked up AC compressor?Your car is not safe to drive since the air compressor is operated by the same drive belt as the remainder of the engine (serpentine belt). Because the AC compressor has seized, this could cause the belt to lock up other components resulting in major engine damage.
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