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Post by unocvin on Jul 16, 2012 16:11:56 GMT 8
Hello. I think my aircon is not functioning as good as before. I made some observation and hope a few of us here can chip in with your observation. This helps prepare me when I visit the aircon specialist and not get conned!
Car idling after driving a few kms. First set: 1. Set mode (center knob ) to MAX A/C. 2. Set airflow to recirculate (right knob light on). 3. Fan speed 1 (so you can here the compressor and expansion valve) Result : Compressor run for about 13 seconds, cut off for about 7 seconds.
Second set: Repeat as in First set but with mode set to FACE (one above MAX A/C), right knob at max cool (blue colour) Result : Same as First Set
Third and Fourth set as above BUT with right knob in the Red heater position (1 o'çlock). Result : same as First set.
So, the right knob is more of a mixer than a temperature setting, unless my temperature sensing is spoilt.
Also, the cycle is way too fast. I think 13seconds-7seconds cycle doesn't seem right for MAX A/C or max cool position. My limited understanding, suggests this is a sign of high pressure in the system causing the compressor to cut out too early.
Appreciate if anyone else can observe based on my settings and post their findings. Thanks and appreciate it!
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Post by junhan on Jul 17, 2012 10:49:16 GMT 8
Oh yeah Mine also faces the same issues as yours. Mine is when Idiling or picking up, air-con isn't cold but as the vehicle reaches 60km/h going to cruising, the air-con will start to turn cold. I tried other setting than Max A/C, somehow can smell the fumes outside, thereafter I set it permanently at Max A/C.
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Post by unocvin on Jul 19, 2012 15:17:18 GMT 8
anyone can help conduct some tests like mine to confirm ...really dun want to anyhow spend money get chop like robert
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Post by vision on Jul 19, 2012 19:53:34 GMT 8
start off by checking the most basic of all. pressure of the a/c gas and oil. u can go to markool at woodland or tomika at ubi. both r specialist in automobile a/c system. fyi. cycle and carriage cars including mercz benz r all subcon to tomika. so i think np.
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Post by vision on Jul 19, 2012 19:59:30 GMT 8
when i jus change ride aircon too not cold. only when car is moving then will b slightly colder. stationery cant feel any coolness. i did mine at tomika. veri honest shop. all he did was top up gas and oil for the compressor. he aso told mi there was a foul smell when jus on the a/c switch if can take out the condenser and cooling coil to wash with a/c chemical treatment and even further cooling effect and most of all can prolong the life of the a/c components.
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Post by petertham on Jul 20, 2012 3:03:27 GMT 8
Hey cerato guys just wanna sure what i have done for my air con. I did a air con heater bypass so only got cold air no longer having hot air now. And the air will be cold without you moving the vehicle. In fact the air can be so cold that you will fall sick. So i installed a thermostat to tell the compressor to rest abit more. I did this in a jb workshop i frequent so if you are interested please notify me can intro you guys. They specializes in air con.
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Post by unocvin on Jul 20, 2012 11:03:42 GMT 8
Appreciate all the comments. The reason I ask for similar testing and observation is to get a base performance for our aircon system; this way i know what is standard and thus can conclude if my aircon is functioning like everybody. I know the aircon shop / mechanics will state the basic like pressure checking etc but they can't say anything conclusive if the problem remains. And I want to avoid a situation where they say it's low gas, then after say or need to clean this or that and then later compressor no good. If they are good they should be able to pin point the problem instead of making us spend money while they cover their bad trouble shooting. I have done the basics - checking pressure and topping up refrigerant accordingly. But it is still doing the 13seconds-7seconds cycle. So if anyone can, please run those simple tests I described, just need to confirm if our system works like that. Thankful for that you are reading and considering my request
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Post by unocvin on Jul 20, 2012 11:08:22 GMT 8
If i understand this correctly - what they may have done is bypass the temperature sensing circuit (thermistor), the compressor thus run full-time and solely dependent on the pressure switch to cut off the compressor when the system reaches the imposed safe working limit. So adding a thermostat seems like restoring it back to how it should be. Was there a problem with your air con to start with? Just curious to learn ... Hey cerato guys just wanna sure what i have done for my air con. I did a air con heater bypass so only got cold air no longer having hot air now. And the air will be cold without you moving the vehicle. In fact the air can be so cold that you will fall sick. So i installed a thermostat to tell the compressor to rest abit more. I did this in a jb workshop i frequent so if you are interested please notify me can intro you guys. They specializes in air con.
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Post by vision on Jul 25, 2012 15:06:46 GMT 8
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Post by petertham on Jul 25, 2012 20:51:06 GMT 8
If i understand this correctly - what they may have done is bypass the temperature sensing circuit (thermistor), the compressor thus run full-time and solely dependent on the pressure switch to cut off the compressor when the system reaches the imposed safe working limit. So adding a thermostat seems like restoring it back to how it should be. Was there a problem with your air con to start with? Just curious to learn ... Hi bro there was no problem with my aircon. What the bypass does is it bypass your car's heater system. Which disconnects your car's heater core from your air con thus no more hot air. And since your aircon always goes pass this heater core it will make your air con hotter than what it can be.(cause they mix cold and hot air together) After the bypass I add a themostat which tells the compressor to take a break when it's too cold. So the air won't get colder.
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