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Thread: cultus 2007 non-efi, cooling decrese after 15 mints, any bro to help me out

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    Default cultus 2007 non-efi, cooling decrese after 15 mints, any bro to help me out

    hi i have cultus 2007 non-efi,
    i serviced it last year, after service it was working fine, the service man said that come again after 2 days when there is sunshine to fill gas again, when i reached to him he attached honeywel cylder and after 1 hour the cooling is low and saying that your compressor is weak, asking 6000rs more , i know he is trying to lootmar some more money,
    Now when i start ac it work good for just 15-20 mints after that cooling is low but not very low,open bont some ice on ac line. throwing water on condenser increase cooling again
    also tell me is this normal with cultus when start ac the temprature needle goes to middle after 25 mints and stay at middle with ac?
    help me plz bros

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    Quote Originally Posted by xain10 View Post
    low refrigerant most probably
    thank you very much xain10 bhai, i will keep this in mind when i go to AC technician,
    also i want to change my radiator also ( double nali) what will be best and which company?

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    today i visited Abu Bakar Ac machanic, he checked it and AC is not triping charged 450Rs for triping sensor & said every thing is ok just go to machanic and disconnect heater for summer season, then i disconnected heater line, now cooling is better..

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    Quote Originally Posted by adeel7771 View Post
    today i visited Abu Bakar Ac machanic, he checked it and AC is not triping charged 450Rs for triping sensor & said every thing is ok just go to machanic and disconnect heater for summer season, then i disconnected heater line, now cooling is better..
    how is in peak hours?

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    Quote Originally Posted by abdkhan2 View Post
    how is in peak hours?
    yesterday i reach abu bakar Ac technician at 1pm noon...im feeling better after heater disconnected...i will post in few days after driving in peak hours stay tuned guys...
    i forgot to mentioned that before visiting Abu Bakar on my way i visited another ac technician also...he told me the same teeka ustad story..service your ac estimated charges was 4000RS

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    Quote Originally Posted by abdkhan2 View Post
    how is in peak hours?
    today i drive in noon, cooling is not chilling but okay.. anybody suggest me how to chilli AC?

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    Lahore

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    contact with trained Car A/C Technician Mr. Haji Shakeel on 03234041972

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    Quote Originally Posted by adeel7771 View Post
    today i drive in noon, cooling is not chilling but okay.. anybody suggest me how to chilli AC?
    contact with trained Car A/C Technician Mr. Haji Shakeel on 03234041972

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    Quote Originally Posted by asjange View Post
    contact with trained Car A/C Technician Mr. Haji Shakeel on 03234041972
    thanks bro for your suggestion, is this person is in Islamabad/Rawalpindi?

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    ac machanic sy service krai thi..service k bad cooling bouht ala thi, ac machanic ny kaha tha k peek time noon ma ana 1 ya 2 days k baad dobara temperature k hisab sy ac gas filling kru ga,but ma 7 days k baad gya tha or in 7 days ma cooling bout he achi kr raha tha, front grill k sath jo silver bottle hoti ha us main bouht fast bubbles nazar aty thy jub ac on kro, lakin jub ma 7 days k baad gya ac machanic k pas tou us ny again gas charge ki phir cooling kam ho gai ha jub sunlight kam ho tou cooling achi hoti ha, peak hours ma kaam hoti ha or phir wo mujy new kahani suna raha tha k compressor weak ha, ab kuch movement nazar b ni ata front grill k agay jo silver bottle lagi hoti ha us ma

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    Quote Originally Posted by adeel7771 View Post
    ac machanic sy service krai thi..service k bad cooling bouht ala thi, ac machanic ny kaha tha k peek time noon ma ana 1 ya 2 days k baad dobara temperature k hisab sy ac gas filling kru ga,but ma 7 days k baad gya tha or in 7 days ma cooling bout he achi kr raha tha, front grill k sath jo silver bottle hoti ha us main bouht fast bubbles nazar aty thy jub ac on kro, lakin jub ma 7 days k baad gya ac machanic k pas tou us ny again gas charge ki phir cooling kam ho gai ha jub sunlight kam ho tou cooling achi hoti ha, peak hours ma kaam hoti ha or phir wo mujy new kahani suna raha tha k compressor weak ha, ab kuch movement nazar b ni ata front grill k agay jo silver bottle lagi hoti ha us ma

    your mechanic does not own a scales?
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    Quote Originally Posted by Xulfiqar View Post
    your mechanic does not own a scales?
    bhai scales mean guages? us ny guage lagai thi jub ac gas fill kr raha tha, i think us ny over charge kr dia ha, kindly mjy chart tou send kro jis par pressure vagara likha hota ha,

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    cooling has been restored to cold now, low side pressure was 60 but now after releasing some gas low side pressure 33 with 1100RPM, head pressure is 50. is this okay or i should increase low side pressure to 40-45?
    still not chilled but cold

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    yes bro it should be b|w 40-45,but gas should be orignal

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    Quote Originally Posted by abdkhan2 View Post
    yes bro it should be b|w 40-45,but gas should be orignal
    can you suggest me what should be rpm because when i lower rpm low side pressure increase to 7-10 numbers...but when i higher rpm to 1300 the low side pressure decrease 7-10 points..can you suggest me rpm please?

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    Quote Originally Posted by adeel7771 View Post
    can you suggest me what should be rpm because when i lower rpm low side pressure increase to 7-10 numbers...but when i higher rpm to 1300 the low side pressure decrease 7-10 points..can you suggest me rpm please?
    probably 1500rpm is good for gas charging and how is the cooling at day time if good then dont mess with it

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    Quote Originally Posted by abdkhan2 View Post
    probably 1500rpm is good for gas charging and how is the cooling at day time if good then dont mess with it
    1500rpm for gas charging..after charging i should decrease rpm to 1200? and whats ideal rpm for normal use mean after gas charg,
    not very good cooling as it was last year, i knew its gas charging problem, because it stoped good cooling after over rechared last time

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    in normal it should be 1200

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    There is a pressure temperature chart for each refrigerant such as R-22, R-410A, R-123A and R-134A (which is commonly used in motor vehicles). You can download these charts for free from google and see what should be the refrigerant suction (return coming to compressor) and discharge (supply from compressor) pressures are at a given ambient condition (the temperature of the place where gas is being charged). Icing on lines occurs in case of low refrigerant charge, read car manual for exact gas quantity required in the system. Most of the gauges used by our technicians are meant for R-22 not R-134a hence they never fill gas according to the desired conditions. Try Suzuki, Honda or Toyota authorised dealers they might have the appropriate gauges.

    All refrigerant systems should be properly vacuum before charging with gas. Air in the system decreased the air conditioning efficiency and increases the power consumption. How do we check if the system is properly vacuum? The vacuum pump has a discharge line, when the vacuum pump is running it is drawing air from the system, they normally run it for 10 to 15 minutes and then introduce the refrigerant. Where as the discharge line of vacuum pump should be submerged in water so that one can see air bubbles. When the air bubbles stop that means that the system is free of air and now you can add refrigerant. Most mechanics don't have a vacuum pump so what they do is purge, add gas in system from one side to push out air from the other side, this is the most inefficient way.

    Lastly, Cultus has no built in cabin air filter which means that the evaporator coil is chocked with dust. The compressor gives optimum efficiency at around 3,000 engine RPM not at low speeds (you can check this on the highway). Similarly, the condenser coil is also clogged with dust, smoke and insects. Add all these and the incompetency of our technicians. And this is not only the case in the motor industry, look at domestic air conditioning market.
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    Quote Originally Posted by mak313 View Post
    There is a pressure temperature chart for each refrigerant such as R-22, R-410A, R-123A and R-134A (which is commonly used in motor vehicles). You can download these charts for free from google and see what should be the refrigerant suction (return coming to compressor) and discharge (supply from compressor) pressures are at a given ambient condition (the temperature of the place where gas is being charged). Icing on lines occurs in case of low refrigerant charge, read car manual for exact gas quantity required in the system. Most of the gauges used by our technicians are meant for R-22 not R-134a hence they never fill gas according to the desired conditions. Try Suzuki, Honda or Toyota authorised dealers they might have the appropriate gauges.

    All refrigerant systems should be properly vacuum before charging with gas. Air in the system decreased the air conditioning efficiency and increases the power consumption. How do we check if the system is properly vacuum? The vacuum pump has a discharge line, when the vacuum pump is running it is drawing air from the system, they normally run it for 10 to 15 minutes and then introduce the refrigerant. Where as the discharge line of vacuum pump should be submerged in water so that one can see air bubbles. When the air bubbles stop that means that the system is free of air and now you can add refrigerant. Most mechanics don't have a vacuum pump so what they do is purge, add gas in system from one side to push out air from the other side, this is the most inefficient way.

    Lastly, Cultus has no built in cabin air filter which means that the evaporator coil is chocked with dust. The compressor gives optimum efficiency at around 3,000 engine RPM not at low speeds (you can check this on the highway). Similarly, the condenser coil is also clogged with dust, smoke and insects. Add all these and the incompetency of our technicians. And this is not only the case in the motor industry, look at domestic air conditioning market.
    hmmm excellent explanation bro, thanks

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