R33 GTS-T Aircon Problems

[joseph0205]

R33 GTS-T Aircon Problems

So just in time for a north queensland summer my aircon on my 1997 R33 GTS-T has decided to only blow hot air. Before this it would ONLY blow cold air when set to 18 degrees and turn to full heater when set to 19 or above, i believe this is a problem with the internal temp sensor or the sun load sensor (i ran the diagnostic test on the head unit) and have found the they may just need cleaning. However now there is absolutely no cold air at all and no discernible load put on the engine when the A/C is switched on as it always used to. I found the problem to possibly be that all the gas had leaked out of the compressor side hose, which filled the activation wire with oil/water. Although, as i am a cheap uni student, i was hoping it wasn't in need of a regassing so i decided to check the plug itself and found that even when the A/C signal and relay sensors are on (shown by the consult port from the ecu) the wire running into the compressor was only registering 0.3Volts (which is what it was showing even when off so i assume it is a background noise voltage or something) so im unsure whether it should be a positive voltage or if it should be earthed . I also know that somewhere there will be a low pressure sensor but as i could not see any more wires running to the compressor i assumed this would all be self contained.

So my questions are:

-Should there be a 12v signal or earth applied to the compressor to engage the clutch

-is there any other wires that i have not seen running into the compressor

-if i manually send a 12v/earth signal to the compressor will i cause any issues (just to check if the clutch is engaging and the problem is i am just out of gas)

and then less importantly

-are the internal temp sensors standardised as i can't seem to find a replacement

and finally does anyone actually have a sun load sensor (from all i've seen in forums everyone seems to get this error)

 

Thanks in advance

Joe

Edited October 12, 2016 by joseph0205