Need A Advice From A/c Experts

[mr.herath]

As a junior I want some advice from you guys. I noticed that when I switched on A/C with low level it gives more cool than switched in high level. I mean normally it should be more cool when switch to the high levels of A.C knw. but it seems to be more blowing power without more cool when increase the A/C. Is this a problem or normal thing? also I don't have any experience with A.C repairing. Is it cost more ? thanks.

[mr.herath]

it seems to be not experts with this forum hah ?

[anjulau78]

it seems to be not experts with this forum hah ?

I am not an expert...

But did U check the A/C gas pressure recently...? It seems to be the cooler matrix dose not get cool enough to handle high air flow.

[rameez]

the blower is only the fan and the compressor works even if the fan is working slow or fast. the reason for you to feel that it colder than when fast is because the air touches your hand quicker and also leaves the evaporator soon rather than when on slow mode .So there is no validity that if you have the fan in slow mode you can save fuel.

[harshansenadhir]

I'm not an A/C expert but can share what I learnt about A/C systems so far.

When the fan is set at low speed, it takes more time to the wind flow to go through the cooler matrix, where it retains more humid (explains the water droplets from the A/C system) in the cooler matrix and air comes out will be less humid than if the fan is set at higher speed. When the air is less humid and it touches the skin it helps evaporating of more moisture on skin which in return absorbs more heat from the skin and now you know why it feels more colder when the fan is set at lower speed. lesser the humidity on the air flow and cabin, the more cooler it will be.

On the fuel consumption, there are two impacts but may not be significant. When the fan is set at lower speed cooler matrix and evaporator will reach the optimum temperature (+5 in most cases) fairly faster. As it reaches the set temperature (non climate control versions) it cuts off the compressor. Therefore when the fan is set in low speed, compressor cut off cycles will be more frequent as oppose to the fan working in full blow. When the fan is working at full speed, it will be tough to the evaporator to reach optimum temperature as it speeds up heat exchange between the internal circulating air (related to cabin temperature) and the cooler matrix.

When the fan is blowing at full speed, it consumes a high voltage which will add a slight load on the engine, as if you switch on headlights you'll feel some load on the engine. This is when alternator starts emitting/regulating the electricity power on the circuit. This load can be very very minimal but as per the laws of energy conservation (?) if the fan needs to be worked faster that additional energy should come from the motion power of the engine. Motion power of the engine is generated from the chemical power stored in fuel. So theoretically additional speed of fan or any electric equipment will result in more fuel consumption even if it's very minimal.

[mr.herath]

I am not an expert...

But did U check the A/C gas pressure recently...? It seems to be the cooler matrix dose not get cool enough to handle high air flow.

the blower is only the fan and the compressor works even if the fan is working slow or fast. the reason for you to feel that it colder than when fast is because the air touches your hand quicker and also leaves the evaporator soon rather than when on slow mode .So there is no validity that if you have the fan in slow mode you can save fuel.

I'm not an A/C expert but can share what I learnt about A/C systems so far.

When the fan is set at low speed, it takes more time to the wind flow to go through the cooler matrix, where it retains more humid (explains the water droplets from the A/C system) in the cooler matrix and air comes out will be less humid than if the fan is set at higher speed. When the air is less humid and it touches the skin it helps evaporating of more moisture on skin which in return absorbs more heat from the skin and now you know why it feels more colder when the fan is set at lower speed. lesser the humidity on the air flow and cabin, the more cooler it will be.

On the fuel consumption, there are two impacts but may not be significant. When the fan is set at lower speed cooler matrix and evaporator will reach the optimum temperature (+5 in most cases) fairly faster. As it reaches the set temperature (non climate control versions) it cuts off the compressor. Therefore when the fan is set in low speed, compressor cut off cycles will be more frequent as oppose to the fan working in full blow. When the fan is working at full speed, it will be tough to the evaporator to reach optimum temperature as it speeds up heat exchange between the internal circulating air (related to cabin temperature) and the cooler matrix.

When the fan is blowing at full speed, it consumes a high voltage which will add a slight load on the engine, as if you switch on headlights you'll feel some load on the engine. This is when alternator starts emitting/regulating the electricity power on the circuit. This load can be very very minimal but as per the laws of energy conservation (?) if the fan needs to be worked faster that additional energy should come from the motion power of the engine. Motion power of the engine is generated from the chemical power stored in fuel. So theoretically additional speed of fan or any electric equipment will result in more fuel consumption even if it's very minimal.

thanks a lot brothers. got more information about the matter. yeah I think there is no matter with the A/C. Actually we had a non A/C car for long years and I was presented this vios 3 months before. therefore I don't know nothing about the A/C. that's why I wanted some advise from you guys.

Also I thought more blowing power means more fuel wasting. but now I can understand it is wrong for some level.( because of the harsha's reply) thanks again brothers.

[mr.herath]

friends, since yesterday a/c has not been working. only blower works but no cooling. I went to some A/C repairing shops and asked for the repairing. most of the shops said it has some leek and need to remove the dashboard and have to do complete service and it costs roughly 10,000. guys do you know samudra who is in the auto weekend program that present the A/C problems?? he told me cooler must have to replace and it cost more than 12,000. so he told that this is a 2003 YOM car and i have to do these services and it cost over 22000. :(/ what do you think bros?? I'm really Disappointed.

[mr.herath]

Edited December 17, 2010 by mr.herath

[mr.herath]

:(

[mr.herath]