Four Car air conditioning compressor Went On Strike At The Same Time. This Is The Original Problem

After entering the summer, the air conditioning compressor of several cars I operated was “locked” one after another, resulting in the failure of the air conditioning compressor system. My drivers complained and I didn’t have time. After I came back, I “enthusiastically” invested in the “hot” maintenance.
At first, I thought these cars were too “old”. The oldest one has run 700000 kilometers. Maybe it’s time to replace it. However, four cars have the same symptoms one after another, which makes me have to doubt.

Air conditioning compressor system failure of four vehicles at the same time

As we all know, the air conditioning compressor is the “heart” of the whole air-conditioning system and the most expensive component in the whole system. Its role is simply understood as: compress the refrigerant of the air conditioning compressor system from low-pressure state to high-pressure state, and then cool it through the condenser. The refrigerant state also changes from high-pressure to low-pressure. Such repetition takes away the heat in the car, “Heat exchange” is carried out through the condenser outside the vehicle to form a closed cycle.

Since we are not professionals, we won’t teach here. This is mainly to explain how to protect our air conditioning compressor system during our daily driving, so as to avoid premature “scrapping” of the compressor and increase our high maintenance costs.

After careful inspection, it is found that the four vehicles have mainly exposed a problem, which is the system strike caused by the “locking” of the compressor, which is similar to the “holding tile” of the engine. It is very troublesome to deal with, because this kind of fault will produce iron filings and block the pipelines, condensers, expansion valves and other parts of the air conditioning compressor system.
Therefore, the air conditioning compressor system should be checked one by one to ensure that there is no blockage, no leakage point and no problem before vacuumizing and adding refrigerant.

For the vehicle repaired this time, the repairman checked that the pipeline was clean, and no leakage was found in the vacuum test, so he began to fill the refrigerant, but the vehicle was still not cooled when the air conditioning compressor was turned on. After stopping the vehicle immediately for re inspection, he found that the expansion valve in the cab was damaged, resulting in the non circulation of the whole system.
This problem is difficult to solve, because this model needs to dismantle the workbench to replace the expansion valve. It is really strong to dismantle the workbench in the sun of more than 30 degrees.

After dismantling the workbench and replacing the expansion valve, the fault was solved, but the engineering quantity is really large enough. Here’s an appeal. I hope that when designing vehicles, the main engine factory should also consider the later maintenance air conditioning compressor, so as to save time for our actual operation and try to be humanized.

After communicating with the repairman, he told me that the main cause of the failure was the heat dissipation problem. You can see that our cars now mainly integrate the condenser into the intercooler water tank to form a whole. When our car runs, it will form a through air flow, and the heat dissipation of the condenser is not a big problem. However, when our vehicle is idling or running at low speed, the heat dissipation of the condenser is not enough, which will increase the pressure of the whole air conditioning compressor system and increase the load of the compressor.

Through these maintenance cases, I also summarized several points for your reference:
1、 We should clean the insect proof net of the water tank regularly so that the condenser can dissipate heat better.
2、 Avoid turning on the air conditioner and blowing the accelerator at idle speed. Imagine that there is no through air cooling in the cab. It’s best not to increase the heat dissipation pressure on the air conditioning system.
3、 Do not use the air conditioner in winter, and let the air conditioner run for 3-5 minutes every other week Because the air conditioner is not used for a long time, the “refrigerant oil” in the compressor will deposit at the bottom of the compressor. When the air conditioning compressor is used in summer, it is very easy to cause the compressor to “pull the cylinder and lock”.
4、 Card friends with strong hands-on ability can refit a set of electronic fans in front of the condenser, which is good for the heat dissipation of the air conditioning compressor system.
summary:
The invention and application of the air conditioning system has made our driving environment very comfortable. Reasonable maintenance of the air conditioning compressor system is also a knowledge we need to master in our daily driving. After all, the maintenance cost of the whole system is really not cheap. After learning the above points, I believe you can more “easily” raise and use cars.