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Hello! I have Hyundai santro and its A/c causing strange problem.

When i switch the A/C on, sometimes it works fine right from start and sometimes it keeps turning on and off especially at idle RPM and occasionally at running the car at normal speed.

I adjusted and increased the RPM a bit but the problem is there. A/C cooling is fine.

Where is the problem, plz guide.
 

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Is it the blower motor or the A/C compressor that is turning on and off?

If its the A/C compressor (cooling power), then this is normal. It should turn on and off depending on weather conditions (ambient temp). The on/off cycle should go around 30 seconds to 2 minute cycles. If weather is cool, then the cycle shortens. If weather is very hot, then cycle lengthens and sometimes will not turn off automatically.

If its the blower motor, then seems you are having a problem that should be checked by an A/C specialist. It could be that the blower motor relay or resistors are failing.
 

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No, its not the blower. Its the A/C compressor and it turns on and off like after every 1-2 seconds and keeps on repeating. on/off on/off

The thing you said about A/C according to temp is thermostat, i understand that.
 

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No, its not the blower. Its the A/C compressor and it turns on and off like after every 1-2 seconds and keeps on repeating. on/off on/off

The thing you said about A/C according to temp is thermostat, i understand that.

Ooopsss.... that is not normal. Compressor on/off cycles should be in in much longer laps. Like 30 seconds to one minute (or longer).

Better have your A/C checked by a specialist. You may have a defective thermostatic switch or air/moisture inside the refrigerant lines.
 

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I am trying to find out if there is a common fault with Hyundai air con. The problem of short run time has developed just after the waranty finished. It is looking like the thermoswitch in my getz. The need to remove the evaporator is not something I am looking forward to & if the thermistor is ok then the electronics from a new unit could be just joined to the blue wires coming out of the evaporator. This would be a 5 min job compared to the removal of the evaporator & the need to regas.
What have you all found??

My thought is 2% likely to be the thermistor & 98% likely to be in the main body of the assembly the harness plugs into.
 

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Howdy buddy, I had the same problem, and the best part is that I resolved it, recently went to a shop and the mechanic said that I don't have to wait much and that I will have time to enjoy the new A/C, he told me that he is doing air conditioning servicing for 10 years and there is nothing he couldn't do. He was right, in less than an hour I got out of the shop with the working A/C.
 
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