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No AC in low RPM

kapilamuni on Mon January 14, 2013 9:31 AM User is offline

Year: 1998
Make: TOYOTA
Model: CORSA
Engine Size: 1500
Refrigerant Type: R134a
Ambient Temp: 35 c
Pressure Low: 50
Pressure High: 175
Country of Origin: Sri Lanka

Hi,

When idling, car at normal temp, the readings are,

low-50psi and high-175psi no cooling.

At 2000 rpm
low - 30psi , high - 220psi
allows good cooling with compressor cut in/out at inside temp 14.5c / 15.5 c, respectively.

No sqeaking sounds and ac belt is tightened properly.

Is the compressor caput? or.......

thanks in advance.

rgds

kapila

TRB on Mon January 14, 2013 10:41 PM User is offlineView users profile

Seems to be working correctly. Make sure you have a proper refrigerant capacity in the vehicle.

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kapilamuni on Tue January 15, 2013 10:10 AM User is offline

Thanks but howcome it does not cool when in traffic/ idling(@900RPM) ?

Rgds

Cussboy on Tue January 15, 2013 12:41 PM User is offline

I looked this up on Internet, so Corsa seems to be cooled by electric fans. Make sure that when the AC is switched on, that ALL the fans are spinning, that's what cools the AC condenser.

Also, at idle rpm are lower, so less refrigerant pumped per minute. Also, less ram effect of air through the evaporator and radiator at idle. So not abnormal for idle performance to be less.

kapilamuni on Thu January 17, 2013 9:23 AM User is offline

Yes, it's cooled by two electric fans & both are fine. Also agree with you on the less ram effect when idling. But AC was cooling perfectly even at idle.
The issue is a very recently developed one. I have no clue. BTW it's a diesel .

rgds

Cussboy on Thu January 17, 2013 1:05 PM User is offline

Quote
Originally posted by: TRB
Seems to be working correctly. Make sure you have a proper refrigerant capacity in the vehicle.

You might be a few ounces low on refrigerant through normal attrition, and this loss of cooling has happened a little over time.

kapilamuni on Sat January 19, 2013 9:34 AM User is offline

Well, got it top-up by an AC shop. They judge the amount of R134a requird, by the dew on the pipes. Still the same issue at low RPM. They say it's the compressor. Is this a possibility?

thanks

Dougflas on Sat January 19, 2013 5:06 PM User is offline

The first thing you need to do is recover the freon and put the proper amount in the system.

coldstar on Mon January 28, 2013 10:13 AM User is offlineView users profile

open orifice is also a problem.

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coldstar

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