Pressure Switch Location?????

[LordNelson]

Can anyone help my locate the Air-con pressure switch on my S3 8L (2000).

I might be being stupid but cant locate it.
I need to test the switch before i go and buy a new one.

thanks

 

[Staz]

You may have more luck in the 8L forum mate.

 

[mike-turbo]

its behind the heat sheild at the back of the turbo

 

[technics100]

On the A4's the pressure switch is located on the air-con radiator near the pass side headlight, its just a unscrew and change job..

 

[Wobbler]

Does the system need the gas removing first? My A4 has a blown fuse 6 (air con pressure switch) and blows a new fuse as soon as the ignition is swiched on. I'm thinking that if the wiring is ok (will test for a dead short at the plug when I find the damn switch) then the pressure switch must have died and gone dead short.

 

[Staz]

Yes mate if you want to change the pressure switch the whole system needs to be recovered

 

[Wobbler]

How the hell can you get to the sensor? Please tell me you don't have to remove the front bumper!!

 

[Staz]

You may have more luck asking in the A4 forum mate.

 

[technics100]

Does the system need the gas removing first? My A4 has a blown fuse 6 (air con pressure switch) and blows a new fuse as soon as the ignition is swiched on. I'm thinking that if the wiring is ok (will test for a dead short at the plug when I find the damn switch) then the pressure switch must have died and gone dead short.

No it doesn't (B6 A4) it just unscrews and unplugs..

 

[NHN]

its behind the heat sheild at the back of the turbo

Yeah this is where it is I believe, as thats what I had to change on my late 99 S3 once, I lost cold air, so changed this which was £50 & it worked again, its slightly more to the right IIRC from the turbo, but is hidden behind the heat shielding in that area attached to the silver pipes & as already said, they emptied system then regassed to do the job.

 

[Staz]

No it doesn't (B6 A4) it just unscrews and unplugs..

Ok if you do it that way you'll vent all the refrigerant!

 

[NHN]

I would have to agree, given the name of the actual switch it would suggest its not a good idea to undo it without removing the pressure it reads, given its refridgerant that wouldnt be wise huh Staz.

 

[Staz]

...and illegal!

Plus it would allow air into the system if it was done that way so it'd have to be deep vacuumed before recharging.

 

[Wobbler]

I have read that the switch screws into a valve assembly similar to a tyre valve, although this would mean some gas would escape as the valve was removed/fitted.

Think I'll get the garage to do it for me.

 

[NHN]

Advisable mate, given the system involved & yes, iirc, it just screws onto the pipe as such.

 

[Staz]

Yeah and as the refrigerant escapes it super cools and will give you frostbite.

 

[Wobbler]

Sooo. gloves would be advisable then?.......just kidding, given that the bumper has to come off and that I have no inclination to undertake a job I'm unsure of, I'm gonna book it into the dealers.

 

[NHN]

Why take it to a dealer mate, take it to any garage that has an ac gasser, they can remove the bumper & re-gas for a hell of alot cheaper than audi for sure.

 

[technics100]

Changing the G65 pressure switch does not vent the system. I have changed the sensor, it just unscrews and the new one screws in.

 

[Staz]

Changing the G65 pressure switch does not vent the system. I have changed the sensor, it just unscrews and the new one screws in.

How does it keep the refrigerant in then?