leeds lad
10-07-2017, 10:50 PM
I hope I have posted in the right place - can someone move it if not
I have a 2011 Golf 1.6 tdi. The aircon doesnt work and there are no fault codes in 08 or any of the other systems (apart from 'control for signal Horn 009 - open or short to ground)
So I have compared the vacom measuring values with an identical car who's aircon works fine. When the engine is started the gas pressure raises (over a few minutes) from 5.2 bar to 10 bar and the 'temp after the evaporator' reduces from about 24 deg down to 5 deg
The air con that doesnt work has a gas pressure of about 6 bar and raises to 7 bar over the same time) and the 'temp after evaporator' stays about constant hence not cooling.
The 'compressor load' is about the same on tickover and reduces by about the same amount on both cars as the revs are raised to 1800 rpm -starts about 2.2 nm reducing to about 1.5 nm probably a little bit lower on the car that is working but I put that down to there being a bit less gas in that one.
Am I right in thinking that if the 'expansion Valve' is stuck open or partially open there will be no differential in gas pressure and no cooling plus would this prevent the gas pressure rising as the compressor has little resistance to work against?
in my head the compressor is increasing the gas pressure a small amount so must be working at least a bit - do they usuall fail completely or just start to go week?
Would a faulty compressor have the same effect and is there anything that I should be looking for on vagom that gives an indication of whether the fault is in the expansion valve or the compressor. The problem is the compressor is dear and I dont want to waste my money if its not the compressor. - were they as till as problematic in 2011 as earlier models?
Thanks for any input
I have a 2011 Golf 1.6 tdi. The aircon doesnt work and there are no fault codes in 08 or any of the other systems (apart from 'control for signal Horn 009 - open or short to ground)
So I have compared the vacom measuring values with an identical car who's aircon works fine. When the engine is started the gas pressure raises (over a few minutes) from 5.2 bar to 10 bar and the 'temp after the evaporator' reduces from about 24 deg down to 5 deg
The air con that doesnt work has a gas pressure of about 6 bar and raises to 7 bar over the same time) and the 'temp after evaporator' stays about constant hence not cooling.
The 'compressor load' is about the same on tickover and reduces by about the same amount on both cars as the revs are raised to 1800 rpm -starts about 2.2 nm reducing to about 1.5 nm probably a little bit lower on the car that is working but I put that down to there being a bit less gas in that one.
Am I right in thinking that if the 'expansion Valve' is stuck open or partially open there will be no differential in gas pressure and no cooling plus would this prevent the gas pressure rising as the compressor has little resistance to work against?
in my head the compressor is increasing the gas pressure a small amount so must be working at least a bit - do they usuall fail completely or just start to go week?
Would a faulty compressor have the same effect and is there anything that I should be looking for on vagom that gives an indication of whether the fault is in the expansion valve or the compressor. The problem is the compressor is dear and I dont want to waste my money if its not the compressor. - were they as till as problematic in 2011 as earlier models?
Thanks for any input