|Lack of cool air
I own a 2004 Honda City VTEC. Last
month, the air-conditioning system
stopped blowing cool air when I was
stuck in a traffic jam or the car was at
idling speed for more than 10 minutes.
This happened in the afternoon when
the external temperature was very
However, after the car was at normal
running speeds for a few minutes, the
air-conditioning started functioning
There was also a knocking sound
coming from under the bonnet when
the air-conditioning started malfunctioning.
The air-conditioning runs very well
during morning and night even when
the car is at idling speed for more than
I have been to my authorised dealer
where the air-conditioning technician
said it was due to a problem with the
magnet which needs to be changed.
I have also checked with a car workshop where the supervisor suspected
the pressure sensor in the compressor
is overheated and thus, would stop
working temporarily. If this is the case,
the entire compressor needs to be
replaced as the supervisor said there
were no spare parts for the pressure
What is your opinion ?
Answer : Most air-conditioning systems fitted today in cars have temperature and pressure sensors that would cut off the
compressor if the line pressures or the
temperature in the condenser become
The line pressure gets very high when
there is excessive heat or if there is a
blockage in the hose, and this will cause
the hoses to burst.
Get someone to check the line pressures when the car has been idling for a
long period and also, if the condenser is
clogged with dirt.
The problem cannot be with the compressor clutch magnet because it is electrically operated and it is disconnecting
because the current is being switched
off probably due to the high pressure or
temperature. The cause has to be found