need help with AC issue on LR3 2008

gtbros · 25th September 2018, 04:24 AM

dear friends ,
I badly need advice from professionals on my issue with ac on lr3
AC is not cooling, i have tried and checked everything already but still cannot identity the reason of failure
i checked the low and high pressure in the system.

by doing this i checked if there is freon in the system with a needful pressure

IMG_20180924_165644.jpg

Then I started the engine and checked it again with working ac set on max.cold and got this result. pls see the picture below
IMG-20180924-WA0015.jpg

almost no changes. so i decided the compressor is not pumping the gas.
Then I scanned the system with launch 431 and got some troubles codes

IMG_20180924_155957.jpg

fault code: B1A70 Compressor solenoid positive supply

I decided to connect the compressor directly to the battery. After that I got this results on the pressure gauge. Pls see picture below

IMG_20180924_171148.jpg

so the compressor has started pumping.

I checked the evaporator's pipes, inlet (high pressure line) was extremely hot, outlet(low pressure line) was just a warm.So AC is still not cooling

few days earlier I changed the expansion valve and evaporator, so it supposed to be working

please help to identify the problem. why ac is not cooling?

**theelms66** · 25th September 2018, 08:34 AM

How much gas/freon did you pump back in after evaporator change ?. Check site glass above drier for bubbles

**PerthDisco** · 25th September 2018, 09:13 AM

I see you are UK brethren seeking Aussie help. Our cars suffer a lot less corrosion related problems. On Disco3.uk older cars especially with rear AC suffer corroded pipes, pin hole leaks and loss of gas as a common fault.

In the recent UK heatwave many owners turned on their AC for first time and experienced a spate of seized compressors, failed pipe work and no AC function.

An Aussie system rarely gets turned off and lasts a lot longer without pipe corrosion.

gtbros · 25th September 2018, 02:25 PM

Originally Posted by theelms66

How much gas/freon did you pump back in after evaporator change ?. Check site glass above drier for bubbles

I didnt measure the weight, was adding the gas until it reached approx 140 psi

gtbros · 25th September 2018, 10:56 PM

Originally Posted by PerthDisco

I see you are UK brethren seeking Aussie help. Our cars suffer a lot less corrosion related problems. On Disco3.uk older cars with rear AC suffer corroded pipes, pin hole leaks and loss of gas as a common fault.

In the recent UK heatwave many owners turned on their AC for first time and experienced a spate of seized compressors, failed pipe work and no AC function.

An Aussie system rarely gets turned off and lasts a lot longer without pipe corrosion.

thanks mate for the comments, agree, uk based cars undergo corrosion much more then australian and ac is off most of the times but my case is a bit different. all is ok and seems functioning fine but ac is not cooling, just blowing

Ean Austral · 26th September 2018, 06:38 AM

So after you replaced the parts , did you vac the system out ? Did you replace the dryer or put any extra oil in the system.

You have put the correct gas in the system ?

Cheers Ean

gtbros · 26th September 2018, 10:17 PM

Originally Posted by Ean Austral

So after you replaced the parts , did you vac the system out ? Did you replace the dryer or put any extra oil in the system.

You have put the correct gas in the system ?

Cheers Ean

hi Ean, thank you for the reply.
yes, I did vac the system but didn't put any extra oil in it. Can it be a reason of failure ?
also I believe that the previous owner recently had changed the condenser along with the drier (it looks new )
Can we assume that if pressure in the system is good both, the drier and condenser are ok?

**kelvo** · 26th September 2018, 11:27 PM

Originally Posted by gtbros

I didnt measure the weight, was adding the gas until it reached approx 140 psi

What gas did you put in the system?

gtbros · 28th September 2018, 04:15 AM

Originally Posted by kelvo

What gas did you put in the system?

134a technoair

**kelvo** · 28th September 2018, 07:57 AM

Originally Posted by gtbros

134a technoair

First thing you need to do is RECOVER all the refrigerant from the system, evacuate the system again, then recharge (In liquid form) the correct WEIGHT of new R134a. The correct weight will be on a sticker under the bonnet.

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