R32 Gtst Aircon Problems (no Cold Air)

[Godzilla32]

Why would a coolant temp sensor have anything to do with your air conditioning?? If you just yanked the sensor out of the box then you have pulled it out of the fins of the evaporator where it should be. Why are you going to a peroformance workshop for an aircon issue?? Take it to an aircon spcialist that is familiar with aircon. Makes more sense.

[Cubes]

When the engine overheats (high water temps) it cuts the a/c. High engine temps = no a/c.

Sensors usually go the other way though.

[Black Widow]

Hey guys,

anyone know anyone good in sydney that can do air con? I'm not real good with all the sensors. Unless someone here can give me a real good explanation of what to do? I tried testing the diagnostics on the air con, and going off the readings its definitely a sensor because the code that flashes (like the one that says whats wrong) for some reason flashes -26. I don' t get it? Then the numbers that come up by pressing the heat button are 3, 41 to 47 by pressing the amb button, and 5. The temp readings i get on the number 5 by pressing the amb button are 23.5, 27,19, and 15. Can anyone help me? Does that mean anything to anyone? i'm fairly new to the whole jap import thing and i want to be able to do work on my car.

Thanks guys

[Archie]

-26 is your refrigerant temp sensor, i think? i had the same fault in my car.

Take out your glove box (just two screws underneath the glove box), then have a look behind with a torch. you'll see the aircon box. look for any leaks or anything out of order (most likely one of the sensor connectors could be unplugged?) The refrigerant temp sensor connector plug is (black), its up on the top edge of the aircon box in the middle of 2 (white) connector plugs

Best thing to do is have a look at the problem area physically first.

[BH_SLO32]

Now ive just found out that my water temp sensor is showing up on the diagnostics check (No. 23 flashes)

Would this sensor be enough to stop the compressor from kicking in? And also, is this sensor under the car?

Just a quick correction, the water sensor is in fact attached to the heater hoses on the firewall behind the intake camshaft cover (a 2 pin connector). It has nothing to do with the ECU water sensor at the front of the motor.

The power feed for the compressor passes through the pressure switch (consider it a fuse) before connecting to the compressor. The compressor operates off a relay which is triggered by earthing pin 9 on the ECU. The ECU controls the operation of the compressor so that when under load it can switch it off.

Have you verified that pin 9 reads approx 12v with the A/C off and is earthing (dropping to 0V) when the A/C button is pressed? By doing this you will be able to isolate the problem to either the power supply to the compressor or the signal coming from the climate control (via pin 46 on the ECU).

On a side note have you checked the in-cabin air temp sensor (adjacent to the ashtray). If this is unplugged (required when removing the surround trim), you will only get hot air (I guess the climate control assumes it is reading very cold).

Hope this helps.

Cheers

[Cubes]

Ahh yes I have seen that sensor..

Assumptions are bad.

[Archie]

cheers BH slo32,

Checking the computer pins 9 & 46 was the very next thing on my check list, i will probably do that today, seeing that its a public holiday..

I hope this is it....

Also i just replaced the water temp sensor near the firewall, and it fixed the sensor reading in diag mode, but done nothing to kick in the compressor