Air conditioning not working

DXX

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Thanks again @mmi.

Checked again this morning with ignition on only. 18 degrees and 2 bar.

If yours is normal then mine is running with 50 percent pressure so looking most likely I do have a slow leak from somewhere.

This might explain why it worked fine after being regassed a few months ago.

They did a pressure check at the time before refilling which came back OK but if it takes a few months to lose pressure maybe the 5 or 10 minute check they did wouldn't detect it.

I've seen some leak sealing regas/refil options on the net but don't fancy putting that in the system in case it causes other problems down the line.

Think I just need to get it booked in somewhere to look at. Anyone any suggestions in the Hull area other than main dealers?

No sense having a regular regas again if it's just going to do the same in a few months.

Don't know why the fan doesn't kick in though......
Not sure how they were checking for leaks but they obviously didn’t find it.
There are units like this that can locate the gas leak, others are available; 0563 3163 | Testo 438A, CFCs, HCFCs, HFCs, R134a, R-22, R-404A, R-410A, R-507 Handheld Refrigerant Leak Detector | RS Components
There are also units that detect ultrasound, very sensitive to any leaking gaseous fluid, others are available; FS.LKC.001(-01) | SDT Ultrasound Solutions LEAKChecker Ultrasonic Leak Detector, 160x128 Display | RS Components
I’m certainly not suggesting you buy them, just indicating that it’s a specialist field and some might be better at it than others!
 

Scut

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I'm going to try and find a local garage with some decent equipment like mentioned above and check properly for leaks. Hopefully they'll find it without too much trouble.
 

mmi

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Don't know why the fan doesn't kick in though......
Wondering if this is a chicken-egg dilemma - as there is not enough pressure (=heat) there is no need to turn the fan on.

Just looked into my data - the fan turned off even at MAX COLD though van speed was then 50 mph thus enough airflow. Just saying that the logic probably is more complicated than simply wired into temperature knob. As there isn't (available as data or even sensor) refrigerant temperature, the logic just might take benefit of the pressure as it has a relationship with generated heat.

Some background for the pressure data:
The AC was serviced in February- had been run 2 years 10 months (48000 km)​
Refrigerant R134a drained - 500g. Refill 600 g. Vacuum tested 20 mins.​
The loss was said to be typical for Transporters.​
 

DXX

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My May 2016 van has never had an AC service, AC has always been running over all 48000 miles (76800Km), still runs very cold and adequately cools my van in strong sun at ambient 30 deg C with re-circulation on fan set point 2. Very well insulated campervan.
 

mmi

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I'm going to try and find a local garage with some decent equipment like mentioned above and check properly for leaks. Hopefully they'll find it without too much trouble.
Success?
 

Scut

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Nope not yet, did look for somewhere local to Hull at the time but nowhere obvious to take it, and life has since got in the way! Need to get my finger out and get it sorted.....
 
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Mud Digger

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T6 Guru
best to run the A/c at least once a week to keep the seals oiled up and stop the leakages

for cooling or dehum from condensation
 
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