RS2 intermittant A/C

[s2audi]

posted for a friend....

My aircon works fine when the car is moving but when stationary for more than 1 minute the aircon switches off and comes on again when moving.

I've heard that there are two temp sensors, one is at the front of the car on my right hand drive RS2 under the NS front valence about 50mm long with black shroud which also controls the temp readout metre inside the car and the other maybe in the fresh air intake under the pollen filter but is different in appearance being about 20mm dia made from stainless steel with two screw fixing either side, does this sound correct ?

do you know how to tell which one is probably faulty.


Gareth Davies
Lower Earley
Reading
Berks

[Martynf]

Gareth,

I am no expect on AC, Audiman is the most qualified to comment on air con, he is a god with air con, but whilst you're waiting for his reply, is the aircon belt tight?

The temp sender behind the front panel feeds the air temp gauge yes, and if the air temp is lower than 5 C then the AC will not run (safety feature) this information is taken from that sensor.

Check basics first, like the drive belt!

[super-g]

Hot Air

Thanks for reply Martyn

Everything works fine when starting from cold, its only when it gets really hot
under the bonnet and stopping in traffic that the aircon pump stops working, the fan is still working. The pump will only kicks in again when you start moving, the aircon fan is working all the time.

This might sound normal, yes if the aircon pump would kick in again in the stationary position. Its only when your on the move again that the aircon pump kicks in.

If you stop the engine and restart without moving the aircon pump usually stays on all the time with the second high-speed fan cutting in.

When the pump is working the inside of the car is very very cold.

Hope someone out there is an Aircon Genius? What do you think Martin.

Talk soon

Gaz

[panzerwagen]

Their is a test that can be done.

If it has the same unit that came with the 20V cars. The 20V org. site has the procedure on how to call up the sensors and test them.

[audiman]

This is an odd one! Try extracting the fault codes from the system. Sounds as if the temps in the condenser are getting to high and making the compressor stop. Report back with fault codes if any. When was the last tme it was re-gassed?

[audiman]

Try PM'ing Madshad. Her husband is an AC engineer by trade and does it all day everyday, he may know more than myself

[Samppa]

Hi,

had to dig up this old thread since Im having also trouble with the RS2 A/C. A/C Icon appears in display but compressor wont start. Today I'll visit the local A/C shop for a refill. Here are the codes:

02.1 (G86) Interior temperature sensor, In Headliner, static open

03.1 (G56) Interior temperature sensor, in Instrument panel, static open

05.1 (G17) Outside air (Ambient) Temperature sensor, front, static open

06.4 Engine coolant temperature (ECT), A/C sporadic short

22.3 A/C Refrigerant high pressure switch, sporadic open.

Any Ideas ?

My outside temp gauge went dead couple months ago, does it cause problems with A/C?

[Skull]

samppa: im pretty sure you have some cables cut, or bad connection. your AC is not working because of the 22.3 code

[Samppa]

Any ideas where to start locating these wires ?

[Skull]

start with the one ones you have static open, try to connect the ground wires to a good ground, and recheck the faults. i think you have a ground wire cut somewhere.

[Samppa]

I checked the wires / connections of the pressure switches with a multimeter. Grounding not an issue there. But while removing and reconnecting these, 22.3 code changed to 22.1 . Now the AC icon doesn't stay on anymore in the AC display.

Edit: I went to refill the system, this damn A/C pipe blew 8A0 260 740 AE.. Trip to to stealership tomorrow. Also will replace the dryer.

[Skull]

look: 06.4 Engine coolant temperature (ECT), A/C sporadic short

this means that it gets in short circuit from time to time, this means the wires are cut somewhere.

all the others are static open, this means again some wires are not connected. take a look at the wire that comes from the engine coolant sensor. than take a look at the 3 connectors on the klimabox. u can get to them if you remove the driver side glovebox. chech them very carefully, one of them snaps in very very hard, and maybe it is not fully in.

[archiboy24]

Does your rad fan come on when you turn the AC on? It sounds as if the fan is not running.

[A1QSHIP]

No A/C

Check your multifuncion switch. This is the large brass one on the water outlet on the head. I have seen this switch cause A/C problems before. The newer switches come with three pins instead of the original four. This extra pin was for A/C cutout circut. Faulty MFS sometimes can cause intermittant function.

[alg]

Hi,

had to dig up this old thread since Im having also trouble with the RS2 A/C. A/C Icon appears in display but compressor wont start. Today I'll visit the local A/C shop for a refill. Here are the codes:

02.1 (G86) Interior temperature sensor, In Headliner, static open

03.1 (G56) Interior temperature sensor, in Instrument panel, static open

05.1 (G17) Outside air (Ambient) Temperature sensor, front, static open

06.4 Engine coolant temperature (ECT), A/C sporadic short

22.3 A/C Refrigerant high pressure switch, sporadic open.

Any Ideas ?

My outside temp gauge went dead couple months ago, does it cause problems with A/C?

This is the only thread that compares to my problems with AC. Leave car standing in warm conditions and it will not start. Try again later the same day cooler starts.
Any solutions to your problems. From this I will get the codes read