Air Con Pressure sensor Easy to change?

[ClaireTME]

Hi all after some help, is the sensor easy to change or not? has anyone got a diagram or something to assist, our point in right dirction to is on the Compressor body?

[Wayne]

The system will need draining 1st, then regassing when finished.

[Davstylee]

The system will need draining 1st, then regassing when finished.

Is this true? I only ask because I had my air con pressure sensor replaced under warranty on Monday, and the service department never mentioned anything about having to re-gas it? I thought they would have tried to charge me the £85 it costs to get a re-gas??? Mind you as my car is covered under the extended warranty, I guess they would just claim it all back from VW anyway?

The car is back in in two weeks for a couple of days because they found some faults with a fan and the pump on the air con, so I will ask about the re-gas then.

[ClaireTME]

I also thought it did not need doing but i do not know where the sensor is so i could be wrong.  I have done a search and some say it does not need recharge only id complete new unit had to be put on

[h8v]

As I understand it, there is a schrader valve behind the pressure sensor, so it can be unscrewed without significant loss of refrigerant.

Then you can just pop on a new high/low pressure valve. 

Are you sure that's the problem.  You can always jump the connections on the connecting plug/socket to check.

h8v

[Colinv]

You definitely don't need to drain the gas out before replacing it. It's a one way valve and shuts off as it's removed. Just a case of removing and replacing then it's good to go. If you look at the front of the engine and look for the air con pipes (2 big silver pipes) follow them
and you will find it along the pipe. You will need a 17mm spanner to remove and replace it. It should be easy enough to get to it

[ClaireTME]

You definitely don't need to drain the gas out before replacing it. It's a one way valve and shuts off as it's removed. Just a case of removing and replacing then it's good to go. If you look at the front of the engine and look for the air con pipes (2 big silver pipes) follow them
and you will find it along the pipe. You will need a 17mm spanner to remove and replace it. It should be easy enough to get to it

Thank you Colin a help as always..

[ClaireTME]

As I understand it, there is a schrader valve behind the pressure sensor, so it can be unscrewed without significant loss of refrigerant.

Then you can just pop on a new high/low pressure valve. 

Are you sure that's the problem.  You can always jump the connections on the connecting plug/socket to check.

h8v

Hi can you explain that a bit better please as i do not understand? i will get the other half to do it if you can explain can it be checked if so how, thank you..xx

[Colinv]

What I think he means is, if you bridge the 2 wires out, I.e join them together or put a paper clip between the two terminals, it will determine whether the high pressure sensor is at fault or not

[h8v]

Not sure about your particular pressure switch, but the ones I've seen contain two switches, therefore four wires.

One switch cuts out the compressor when the pressure is too low, and the other pair cuts out the compressor when the pressure is too high.

If you can check with a circuit diagram what the normal operating condition is, then unplug the switch, and as Colinv says, use paper clip or bit of wire to let the system think the pressure is correct and check if it works correctly.

All you are doing is bypassing the pressure sensor to see if things work properly without it, and thereby seeing if it is what's causing the problem.

But at least we all think you don't need to de-gas the system.