How many kilometers can Buick gl8 run when changing oil?
Vehicle failure: empty car without air conditioning.
According to the owner's description, the air conditioner was not bad last year, but it was opened this year, and there was no air conditioner at all. That's hot air. The owner suspects that there is no refrigerant in it, so let the fat brother make up some refrigerant.
Maintenance steps:
First, check the blank space on the pressure gauge to adjust the pressure.
No pressure is detected in the air conditioning pipeline, indicating that the refrigerant is leaking. Under normal circumstances, after idling for several years, the refrigerant will be lost more or less, but it will not affect the refrigeration.
Due to the leakage of refrigerant, it is necessary to pressurize the air in the air conditioning pipeline, find the leakage point and pressurize it to 200Psi.
After pressurization, test whether the air conditioning system can be started normally. After testing, the compressor fan can be started normally, which shows that it has maintenance value.
After a short wait of 30 minutes, it was found that the pressure had dropped to 160Psi, indicating that the pipeline was leaking seriously.
Check whether there is air leakage at the joint of the pipeline first, which is the most likely place to cause air leakage. Then check the condenser, compressor and the last evaporation box. The principle of inspection is easy before difficult.
Check with detergent foam water and find that the low-pressure pipeline leaks and bubbles are blown.
According to the owner's memory, this pipeline was changed three years ago and is now insured.
The position of air leakage is at the arrow mark, the joint of hose and hard pipe, which looks like the quality is not durable.
A pipe was reissued. The next morning, Brother Pang came late, and the masters had already installed the pipeline and then continued to measure the pressure.
After 5 hours of observation, it was found that the pressure dropped to 190Psi, indicating that there was a small leak in the pipeline. Empty. What I fear most when I check leaks is small leaks. Sometimes after a few days of investigation, you may not find a lot of things when you tear it down. Moreover, this GL8 also has a rear air conditioner and an evaporation box. It is estimated that the presbyopia will be enlarged once you look at it.
Another reason for small leak detection is also terrible, and that is the ambient temperature. Temperature will affect the value of the pressure gauge, for example, the pressure of the pressure gauge will be different in the morning, noon and afternoon, and even the temperature of the engine heat engine and radiator water tank will affect the pressure value, so it is useless to live.
After two days of intermittent inspection, it was finally found that the compressor was leaking. What's more, it's a special leak, and it's the first time for Fat Brother to meet you. I have encountered the leakage of compressor pump head before, and there was a small amount of leakage after the compressor started.
It seems that the compressor is cold and the owner will have to spend a lot of money again.
Throw away the old one.
A small amount of iron pins can be seen at the high-pressure outlet of the compressor, indicating that the compressor has been worn inside. I'm afraid the new compressor will cool down soon after replacement. It seems that the problem is quite troublesome. I hope the drying bottle can filter these iron needles.
After consulting with the owner, my brother will not consider the new compressor. Prepare a treasure to buy auto parts online, around 300 yuan.
Check the arrival situation, block the high pressure outlet with your thumb, and turn the compressor pump head with your other hand. Obviously, you can hear the sound of "snow snow" and feel full of pressure. Although you can't accurately judge the performance of the compressor, you can prove its compression ability.
This time, add two bottles of refrigeration oil to protect the small heart of the compressor.
It is old and new.
Slightly different, but it does not affect the installation and use.
Install the compressor.
After the installation is completed, continue to press. After a whole day's observation, the pressure remained perfect. Next, you can safely pump air and add refrigerant.
After the air conditioner is started, the cold air at the air outlet swishes down before the air conditioner festival.
New: the rear air outlet blows cold air for a while and hot air for a while.
GL8 empty rear row is equipped with independent evaporation box, warm air water tank, blower, etc. Brother Pang suspects that there is something wrong with the heating and cooling control panel, so he needs to take it apart for inspection.
The rear air conditioning system is located in the left decorative panel of the three rows of seats, and it needs to remove the three rows of seats, seat belts and decorative panels, which is a heavy workload.
There is also a real air control valve, which is responsible for the floor air supply in the air duct.
Demolition completed.
Inside is a blue evaporation box and inside is a red heating water tank.
The position marked by the red arrow is the rotation axis of the hot and cold air plate. As shown in the figure below:
Test: Turn the knob to cold air, and the baffle will automatically rotate to hot air after a few minutes. What are the specific reasons for the failure? Fat brother can't say for sure now. I can only guess that this must be the first time that manual air conditioning is abnormal. If it is an automatic air conditioner, it may be fair to say that the evaporation box freezes and automatically heats up and deices. However, in general, the manual air conditioner will stop the compressor after the temperature of the evaporation box rises, so there is a greater possibility of problems in the motor control circuit.
Solution: The simplest way is to turn the empty knob to cold air and then unplug the control line behind the motor. The disadvantage is that there is no warm air in the back row in winter. After Brother Pang communicated with the owner, the owner said he would do it. As long as the temperature drops in summer and the warm wind blows casually in winter, the whole car is hot. And the warm air in the back row is not turned on.
Fat summary: the biggest fear of air repair is small leakage, and some days only leak a little. If you tear down so many pieces and toss around for several days without finding any leakage, then as a fat brother, I am embarrassed to talk about labor costs. Therefore, under normal circumstances, the maintenance master will not accept professional maintenance of empty places, because people have no time to earn this little money. After a week's repair, the compressor and low-pressure pipe cost more than 400 yuan, and the rest is refrigeration oil and refrigerant, and the labor cost is 200 yuan. .
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