A/C Stops Blowing Cold Air After 10 Minutes

Home > Gari Forums > Toyota Forums > Toyota AQUA Forums > Toyota AQUA General Forums

A/C Stops Blowing Cold Air After 10 Minutes

I am the owner of 2012 Corolla Altis 1.6, which has been driven up to 150,000 KM.
The car stopped blowing cold air 2 days ago for unknown reasons and I got the filter replaced and filled up the gas. My mechanic told me that the compressor was worn out and you need to replace it. I did not pay heed to his advice and I contact with the seasoned car AC mechanics.
When they checked my car and told me that the motor near the radiator caused the fan and blade to bubble and it did not allow them to move at the full speed. They told me that they would replace the motor and blade for 10 thousand and if the A/C does not start working, then they would check the compressor. I got them changed but there was no progress and they asked to get the brand new denso compressor, which was cost me PKR 48,000. Is it available at this price range? o r the mechanic is charging heavily from me. They also said that they will change some other brand new parts with the compressor and the total amount will reach to 100k and for the USED parts, it will be 70k.
If someone, who is new and have been in this field for 42 years, will they not point out the exact problem and get it right.

Sajid Khan asked on 16 Dec 2022 15:52:58 pm

1 Answer

13 views |

Sumaiya Akbar - on 17 Dec 2022 14:56:04 pm

Remove the solenoid and test it, it can also be tested with a scan tool, under the hvac menu, the compressor activity is under special functions where you can see the amp draw of the solenoid.

You need to simultaneously see the liquid and suction pressure as the solenoid takes the full 1 amp draw.

If its not then the solenoid is not functioning, you can find a replacement if you are crafty enough.

The way this system works is that the suction pressure is maintained slightly above freezing point verified by evaporator thermister reading and target temperature delta - both are seen through scan tool. While the solenoid idles down to 0.4 amps o r lower, the system immediately reacts to changing rpm o r temperature and is seen as solenoid amp change and verified by gauge manifold. The condenser cooling fan control on this corolla has a module to control rpm and its done by engine ecu which also takes evaporator and liquid pressure data from the ac amplifier.

The one very important factor that dictates good functioning of such system is that you need to use a good vacuum pump and pump down the system to about 500 microns and leave the pump running for about 20 minutes to ensure complete dehydration of the system. Once a good vacuum is pulled then the exact refrigerant amount is installed, a low charge o r overcharge on such compressors never work.