Air Con Inop!

[carclinic]

Hi all,
Driving to work in the 05 Gransport, the air conditioning stopped blowing cold.
Upon inspection the compressor is engaged but no pressure difference- high side and low side pressures remain equal at ambient pressure.
Replaced the compressor/dryer- no change.
Replaced the expansion valve-the same? WT!
Doesn't make sense- what am I not seeing?

Thanks.

 

[gillis]

You have any error code in your temperature display?

 

[Zep]

Hi all,
Driving to work in the 05 Gransport, the air conditioning stopped blowing cold.
Upon inspection the compressor is engaged but no pressure difference- high side and low side pressures remain equal at ambient pressure.
Replaced the compressor/dryer- no change.
Replaced the expansion valve-the same? WT!
Doesn't make sense- what am I not seeing?

Thanks.

When you say ambient pressure, do you mean between 5 and 6 bar on your gauge? This should be the standing pressure with no compressor running.

If yes, then I would say the issue is still at your compressor. The expansion valve will still generate a pressure difference even if it isn’t functioning correctly and the drier will not have any impact on the operation unless it is blocked. Can you hear a click when the compressor is engaged?

 

[carclinic]

You have any error code in your temperature display?

The temp control is a manual unit with no digital display.
My Autel scan tool has no option to read the air conditioning control unit.

 

[carclinic]

When you say ambient pressure, do you mean between 5 and 6 bar on your gauge? This should be the standing pressure with no compressor running.

If yes, then I would say the issue is still at your compressor. The expansion valve will still generate a pressure difference even if it isn’t functioning correctly and the drier will not have any impact on the operation unless it is blocked. Can you hear a click when the compressor is engaged?

Yes, the standing pressure is 6 bar on high and low side. When the compressor clutch is engaged with the engine running the pressures on the high and low side remain at 6 bar. This was the case with the old compressor and now with the new compressor.

 

[Zep]

Ok, you should be seeing a difference even if there is a problem elsewhere in the system. No pumping at all is a mechanical issue with the compressor. Are you hearing the click of the clutch when it is energised? I would take off the aux belt, then jump the input to the compressor and see if there is a change in the resistance to turning the pulley between the two states.