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Thread: Mehran 98 AC Advice

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    Default Mehran 98 AC Advice

    Hi all,


    I need a bit of advice.


    I have for myself a Suzuki Mehran 98 for daily driving. The car has been recently converted to CNG. It is giving fine average and surprisingly the performance hasn't dipped too much either. I had never thought of installing an AC before but now that the heat has become unbearable, I am thinking about exercising the option.


    Could someone guide me to the right place for the above in Karachi? Is installing AC in Mehran a good idea?


    Regards,


    Ottoman
    I am the kind of doctor who guarantees a healhty life but insists on operating your heart with a sword.

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    Default

    Sanden on tariq road go for sanden accessories as it cools better then denso n any other sanden is best for mehran

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    u can opt for a sanden/success a/c syte. the total costs will be about 18500 including installation. but keep some money like 2.5k spare with u cuz u might have to change ur radiator fan and get the radiator serviced as the car might give some heat up problems after getting a/c. but all these problems can be solved and success a/c's perform awesome.

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    Default

    Thanks for the replies guys. I have gotten installed a Sanden AC for 17500. The AC is very good but the car is heating up.
    I am the kind of doctor who guarantees a healhty life but insists on operating your heart with a sword.

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    Default

    Well almost all old mehrans will have heating prob with A/C.


    Best will be to buy a 3 channel japanese charade's radiator.


    Sasta totka will be buy speedy fan our pathan say double speed fan (corolla 88 got a good fan) and relay waghaira lagwa kar it should be running at very good speed.


    And if you can try to find a slim fan that can be fitten infront of condensor.


    Also get the radiaor serviced.
    Speed costs money, how fast can you afford to go.

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    Default

    get ur radiator checked from a radiator wala. maybe it needs cleaning or maybe changing. if it needs to be changed get a double or triple nali radiator custom made or get it from some old parts market. also from an electrician u trust get the speed of ur cars radiator fan checked. if its low then fit in a new mehran's fan motor but its noisy. i would recommend a radiator fan motor out of a civic . the fan motor will cost u around 1k.
    till the heating issue is solved try to avoid using the a/c as overheating can damage the cars engine.

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    BTW if ur going for custom made 3 nali radiator make sure the radiator wala uses japanese jali the local jali will be useless and it will give no improvement at all even though he will give gurantee and all.
    Speed costs money, how fast can you afford to go.

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    hi ,, if u install genuine Denso a/c in meharan u will enjoye better cooling as well as better milage with troble free diriving ,, becuse Denso is orgnaley desiged for mehran according to engine capacity .. if buy sanden ,sucsses these are not genune and not long run relibl..





    if u want cheap and good a/c for mehran pls visit Denso aircon center tariq road. iam sure u will get u compfert

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    Default

    You guys are right about the radiator. The first thing I will do is fill the radiator with a proper coolant rather than water.


    I have recently installed a new temp guage, it gives me a reading of around 25% when the AC is running continuously for around 15 minutes. I think thats pretty OK but first I have to check whether the reading the meter is giving is correct as it is a new guage.


    I am satisfied with the performace so far.


    Thanks all for your suggestions!
    I am the kind of doctor who guarantees a healhty life but insists on operating your heart with a sword.

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    go for Caltex Coolant all others are cheap and fake.
    Speed costs money, how fast can you afford to go.

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    Default

    Hi,

    Mehran is a small and poorly designed car that has a historic problem when it comes to ACs. Typically the AC doesn't quite work well and for old cars, the Car ends up heating up.


    General Causes of heat up


    There are a number of reasons why cars, specially old ones heat up. Problems may be one or more of the following:

    1. Engine needs to be overhauled/li
    2. Begin needs to be changed/li
    3. Clutch plate needs to be changed/li
    4. Radiator needs to be serviced or cleaned/li
    5. The radiator cap needs to be changed (YES THIS IS QUITE IMPORTANT). The spring in the radiator cap is very important. When the water steams up, it pushes part of a cap up and water is allowed to circulate. If your cap is damaged, your car will heat up)/li


    These are causes of car heat up if one or more things are wrong with the car. Obviously, you will need to get your car checked for any of the above mentioned problems to get the car fixed.


    REMEMBER, a few days before you take your radiator to be cleaned, poor in some anti scale and anti rust water treatment chemical in it and let it run for a couple of days. This would remove any kind of scale that is hindering the heat exchange. After the radiator is cleaned MAKE SURE TO PUT ONLY FILTERED WATER in the radiator, as poor quality water leads to severe scaling of the radiator.


    Mehran AC Design Flaw


    Another reason why ACs cause heatup in Mehran is a design flaw, namely the fact that the Radiator and AC Condensor are stacked one on top of the other. What does that mean?


    Water flows in pipes through the engine and absorbs the heat. The hot water comes to the radiator, and passes through thin capilaries covered by the fins of the radiator grill. The air passing through the radiator grill, cooling the water. The cooled down water goes back into the engine. This process goes in a cylce, keeping the engine cool. You have a fan installed behind the radiator grill that SUCKS the air in, to help the process.


    SO ... the radiator has to be COOLER if any kind of heat exchange is to take place.


    The problem is that the AC condensor, which is the RADIATOR of the AC is placed DIRECTLY UNDERNEATH the radiator. The AC works on the same principle of heat exchange, but, basically, the AC gas needs to get cooled. When the AC gas passes through the AC condensor, it tries to loose its heat. This HEAT, heats up the RADIATOR, which is unable to cool the water. So, as only hot water keeps going back into the engine, the engine gets progressively hotter, until you come to a point where you turn off your AC, stop the car and poor water out of the bottles you have stacked under your seat.


    There are a number of things you can do to solve this problem


    Replace the radiator fan with a bigger fan (I put in a corolla fan) with a relay.


    Put a similar fan, with slight modifications to the bumper infront of the AC Condensor


    If you are adventurous, you can get a slight modification done where you can shift the condensor slightly inside, so the condensor is not EXACTLY under the radiator. In this way, you can easily put the fan on the outside without modifying the bumper


    Make sure your gas is full and radiator is in good working order.


    Interesting solutions


    There are a number of other solutions I have seen. The people who did these changes say they work but I haven't actually tried them myself.


    One friend of mine has installed another water bottle (exactly like the one for windscreen wipers). He installed the complete system from an old mehran and placed the two water jets so that they point towards the radiator. According to him, whenever his temprature meter starts going up, he presses a button and it sprays the radiator with water, cooling it for a while.


    Another friend of mine has a Carrier installed on top of his car. He welded a large sheet of metal (painted white) on top of it It is as wide as the car and slightly larger than the length of the roof. It looks very strange but is like the car is always in the shade. And it DOES work really well. In fact, waiting on traffic signals is much much painfree, as you are always under a shade. It is a very innovative and practical solution .... if you dont mind the goofy looks of your car (and of course, slightly compromised aerodynamics).


    Hint


    Always try to use shades for your windows. By personal experience, your AC performance would go up significantly.


    Hope this helps

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    Nice reply Haroon.
    https://www.facebook.com/OsamaAbbasPhotography

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    The solutions provided by Haroon are really very interesting, especially that of washer bottle and spraying water on condensor and radiator is really a great idea.
    Say NO to OPEN LETTERS

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    firstly cleaned the raditor if heated than see cup of radiator change than change it (there is warsal in the base of the raditor cup that have no cut and thin) and inserted coolent in the coolent bottle with the max mark that on the coolent bottle may be ur heating problem solved otherwise relay on ur raditor fan .

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