A couple of week ago I bought a 2002 L322 HSE. However there are a couple of problems with it. The first one is that the air conditioning doesn’t work .

When the engine is ticking over and you push the air con button the aircon light illuminates and you can hear the clutch on the pump clicking in, but as soon as you rev the engine the aircon light goes out. The aircon doesn’t cool. I have had the system re-gassed and checked for leaks, everything’s ok. I’ve also changed the final stage resistor which has made no difference at all.
Secondly, the heated seats don’t work, when you push the seat button it flashes once and then goes out, this is the same for both left and right seats. I’ve checked fuses and everything seems ok.

Can anyone advise as both these faults are driving me crazy?

If the lights go out the system has detected a fault. It may be the ATC unit itself that has gone faulty.

In this instance the only real answer is to take it to a dealer and get them to read the fault codes. Depending on where in the UK you are a member may be able to recommend an Independent garage to help keep the costs down.

Dan 

sorry for being stupid but whats an ATC unit ?

ATC = automatic temperature control...

I’ve had diagnostics run on the vehicle and it shows the air-con evaporator temperature sensor has failed and both heated seat temperature sensors have also failed

Looking to RAVE, I cannot see any reference to the heat sensors, do they actually exist?

Prior to buying the vehicle it was converted to LPG, the engineer reckons that the LPG installer has either unplugged something or taken an existing earth point which has resulted in upsetting the earthing of the system.

Can anyone advise as I would like to try and fix the problem

Mystery solved I now know why the heated seats don’t work; they’re not plugged in.
I can see the leads hanging down from underneath the seats but I cannot work out or see where they plug into. Can anyone advise? Alternatively, if anyone in the county Durham has an HSE that I can have a look at, I’d appreciate it, just so I can work out the wiring

there should be one big plug at the front "RANGEISM WILL NOT BE TOLERATED"
www.futuresecurityservices.co.uk
Pretlove says , '' I want my car back "

The wiring harness that power the seat motors are plugged into this big plug. i cannot see where the heated seat circuit plugs into

there are only four nuts that hold the seat in, take the seat out and have a proper look..

what he said ..........there is a lot of boxs/modules under the passanger seat "RANGEISM WILL NOT BE TOLERATED"
www.futuresecurityservices.co.uk
Pretlove says , '' I want my car back "