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I have a weird AC Issue.

It doesn’t occur in Singapore as drive max is only 1 hour+

Last Long weekend I went to Malaysia and drove my vehicle for 5 6 hours non stop. At around 120 to 150km/h

Ac seems to not work after 3 4 hours of driving and was blowing out not so cold air. Front driver seat was fine but passenger is suffering.

Upon reaching Singapore. Speed was reduced to 90 100km/h. AC start to blow out freezing cold air again.

Temp gauge was half way point which is normal. Coolant EO all in its reasonable limit

At the point of time. NSHW outside temperature is about 38 to 40c range

Edited by Lightsabre
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Sound eerie esp when it is 7th month now.. Hahaha, just joking.

 

My guess is that the temp of coolant is too high for the radiator to cool it down after prolong high speed driving. Quite common.

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A lack of refrigerant.

You should get it check for leaks. If no leak then flush out the old and replenish the refrigerant.

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Sound eerie esp when it is 7th month now.. Hahaha, just joking.

 

My guess is that the temp of coolant is too high for the radiator to cool it down after prolong high speed driving. Quite common.

But the C And H needle did not move at all. Is it normal? All the way at half way point Edited by Goldenvodka
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i would think is your radiator and condensor issue. as they age the fins maybe clog with dirt and dust and probably oil causing the optimal efficency of the radiator and condensors.

 

this is normal i guess as the fins and coils inside cannot disperse the heat properly hence is hot. travelling at 120-150kn/hr does helps the colling down of engine but likely cause is still narrow down to radiator and condenser aging.

 

moreover AC system also is linked to both radiator and condensor as part of one system.

 

just my 2 cents thoughts.

Edited by StreamRSZ

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Is the volume or air coming out still the same? Then it isn’t a frozen evaporator. Then likely compressor issue or the compressor clutch not engaging at higher rpm.

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Is the volume or air coming out still the same? Then it isnât a frozen evaporator. Then likely compressor issue or the compressor clutch not engaging at higher rpm.

Did not feel any difference in air flow.

I Guess for the time being just live with it. No point changing the compressor at this moment

 

Did a small test in the carpark. When vehicle is idling. Ac works fine with compressor engaged and fan spinning normally

Edited by Goldenvodka

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At the point of time. NSHW outside temperature is about 38 to 40c range

Outside temperature so high? Doesn’t sound right. You may have a faulty thermostat.

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Did not feel any difference in air flow.

I Guess for the time being just live with it. No point changing the compressor at this moment

 

Did a small test in the carpark. When vehicle is idling. Ac works fine with compressor engaged and fan spinning normally

I think it is likely the compressor too. if you dont go NSHW or long duration driving too often, I dont think you will face the problem again. Next time if you fcce the problem again, you may want to find a rest point to let the compressor cool down for a while before you drive on and see if it helps improve the situation. Edited by Ct3833

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Can it be engine heat is too strong causing air conditioning is not performing normally?

 

 

like what i mentioned, the issue could be your radiator and condensor. heat cannot properly escape due to aging radiator and condensor.

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like what i mentioned, the issue could be your radiator and condensor. heat cannot properly escape due to aging radiator and condensor.

Eh? How can it be? Isn’t the airflow at 140kmh higher than 90kmh?

 

Pretty sure it’s compressor and gas related as the rpm at 140kmh is probably at least 4k vs 3k or less at 90kmh. The compressor used in the swift is clutch driven and not a variable displacement one.

Edited by Mkl22

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Eh? How can it be? Isn’t the airflow at 140kmh higher than 90kmh?

 

Pretty sure it’s compressor and gas related as the rpm at 140kmh is probably at least 4k vs 3k or less at 90kmh. The compressor used in the swift is clutch driven and not a variable displacement one.

 

maybe you are right also. but anyway if you dont often msia than just live with it. by right at 140km/hr engine should also be cool enough to cool down engine and also coolant.

 

TS can send to workshop to check on gas level. if gas level is not at the normal range than could be like what you say compressor issue.

 

But if the gas level is at the normal range than it could likely be something else as i mentioned.

Edited by StreamRSZ

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Frankly asking here also make you confused with all the theories.

 

Bring to a aircon workshop better.

 

But since it’s working well here, just leave it.

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Can it be engine heat is too strong causing air conditioning is not performing normally?

Cannot be.

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85% of the time, air con issues are due to a worn out compressor. For compressors, make sure to always get brand new and never salvaged or reconditioned parts.

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85% of the time, air con issues are due to a worn out compressor. For compressors, make sure to always get brand new and never salvaged or reconditioned parts.

I think you are exaggerating la. Maybe 50% of the time. There’s so many other components that make up the aircon system. Condenser, cooling coil, etc.

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there's a possibility that the cooling cool is frozen at that period of time, thus halted the cooling effect.

 

at higher speed, your engine RPM is higher, and it spins your compressor at a higher RPM, pushing your compressor to cool the cooling cool faster and cooler until it reaches a freezing point, especially if AC temperature is set at the lowers (coolest).

 

next time, you can try, to adjust the temperature not so cold, thus allowing the thermostat to have some time gap to cool down before it keeps freezing the cooling coil.

 

Just sharing my old experience.

Edited by spinergy25

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Wah, so many pattern.

 

Actually, most compressor can only tahan up to 4500~5000rpm max.  Beyond that, either the compressor will break or the pressure become too high lor.

 

It is likely that the pressure become too high and the pressure sensor flagged to trip the compressor lor

 

And why pressure become too high, over fill of gas and even oil lor.

 

For me, I hardly or never top up gas or oil lor ...... and when I did, the evaporator died a few months after.  Of course, could be aging la, or already leaking.  This is really hor, beyond my scope lor.....

 

 

So, if aircon is already working, why fix it lor. No top up la, cleanse pipe la ..... whatever.  What ? Aircon got smell ? Just turn the temp to max for 5~10mins and all smell cooked lor ........

 

 

 

I have a weird AC Issue.

It doesn’t occur in Singapore as drive max is only 1 hour+

Last Long weekend I went to Malaysia and drove my vehicle for 5 6 hours non stop. At around 120 to 150km/h

Ac seems to not work after 3 4 hours of driving and was blowing out not so cold air. Front driver seat was fine but passenger is suffering.

Upon reaching Singapore. Speed was reduced to 90 100km/h. AC start to blow out freezing cold air again.

Temp gauge was half way point which is normal. Coolant EO all in its reasonable limit

At the point of time. NSHW outside temperature is about 38 to 40c range

 

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there's a possibility that the cooling cool is frozen at that period of time, thus halted the cooling effect.

 

at higher speed, your engine RPM is higher, and it spins your compressor at a higher RPM, pushing your compressor to cool the cooling cool faster and cooler until it reaches a freezing point, especially if AC temperature is set at the lowers (coolest).

 

next time, you can try, to adjust the temperature not so cold, thus allowing the thermostat to have some time gap to cool down before it keeps freezing the cooling coil.

 

Just sharing my old experience.

Hi, I second that.

It's easy to conclude, since issue only occurs in long distance drives.

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there's a possibility that the cooling cool is frozen at that period of time, thus halted the cooling effect.

 

at higher speed, your engine RPM is higher, and it spins your compressor at a higher RPM, pushing your compressor to cool the cooling cool faster and cooler until it reaches a freezing point, especially if AC temperature is set at the lowers (coolest).

 

next time, you can try, to adjust the temperature not so cold, thus allowing the thermostat to have some time gap to cool down before it keeps freezing the cooling coil.

 

Just sharing my old experience.

Car air con do not work that way. Its not a home air con.

 

Regardless of what temp is set at the thermostat, the cutting in and out of the compressor is the same.

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Last year did a gas topup, was told to watch my compressor, cutoff intermitently.

After one year, only hot air even in highway, went in jb near the KSL, replaced the whole cooling systems, a recon compressor, a oem new cooling coil and condenser as the old systems lasted me 15years. Damage 1000rm.

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