free hit
counters
Sudden loss of Air Con - Interior/Exterior/Lights/Glass/Alarms/ICE/HVAC/Other - The Lotus Forums Jump to content

Recommended Posts

Hi, As title says, I've lost my cold air this last week, I've no error messages on dash, no funny noises, no blown fuse under the front access panel (fuse 20 AC Clutch - 7.5A) and no differences in compressor engagement sound if I toggle the "dimly" lit AC control switch.

Car is on just under 15k miles and driven all year round with air con on and I've had 5+ years of lovely cold air so is it reasonable to think a simple re-gas is required?

Very annoying since we've just had 2 warm weeks so any troubleshooting procedure would be welcome as there's not a lot in the service manual.

Cheers,

Mario

 

Edited by mario308

Share this post


Link to post
Share on other sites
Upgrade today to remove Google ads and support TLF.

Just checking are the blowers all working fine, the fan speed changing as per the norm?

Share this post


Link to post
Share on other sites
21 minutes ago, alias23 said:

Just checking are the blowers all working fine, the fan speed changing as per the norm?

Yep, the cabin fan runs as normal i.e. all 3 speeds work ok and I can still direct the airflow around as per vent direction control. 

Share this post


Link to post
Share on other sites

Then it does sound like blower motor or resistor pack. Maybe contact Dave at H111 as they’ve had a few customers with heater/air con problems so maybe able to help.

Share this post


Link to post
Share on other sites

Sorry I think you’ve misunderstood the problem. Nothing wrong with the blower/resistor pack. Everything works except no cold refrigerated air coming out, it’s just at ambient on the coldest (AC) setting. Hot setting is as normal.

Share this post


Link to post
Share on other sites

Could be the AC unit needs checked for a leak? I know the older s2 Exige were notorious for the pipes in the sill cracking but haven’t heard this as being a common problem in the S3. 

 

Sorry cant be of much more help. It does sound like the unit needs recharged and a check for leaks. 

Share this post


Link to post
Share on other sites

Sounds like you need to get it vacuum tested for leaks, and then re-gassed.  If it has suddenly stopped, then it probably has a leak somewhere...

Dave

Share this post


Link to post
Share on other sites

Thanks Dave, I’ll post on here once we find out what went wrong. My original post was to see if anyone had any method or experience of testing the system e.g. by using a digital multimeter on any sub-circuits or relays. 

Share this post


Link to post
Share on other sites

Not sure if you can easily see the clutch on the compressor if the middle is turning then the compressor should be turning if the middle is stationery then the compressor is not running 

If the system has lost gas then the compressor should not run all the cars I've worked on have a low and high pressure cutout switch.

If the compressor is running and the charge pressure is low don't run the compressor as it requires returning refrigerant to cool the compressor and also an oil mist in the refrigerant to lubricate it.

It could be that the valves in the compressor are damaged and so not compressing the gas time to get some gauges fitted to check the pressures.

If the pressure is low 

Standing pressure for R134a at 20'C should be around 4.7bar.   @ 15'C should be approx 3.87bar and 10'C  3.14bar 

Then start looking for a leak as Dave said you can check by pulling and more importantly holding a vacuum.

But to find a leak then a pressure test with dry Nitrogen will be required paying perticular attention to the glandseal behind the magnetic clutch on the compressor.

If there is a leak hopefully it will be large enough to find with bubbles or you may be able to hear it if it's small then you may have to add fluorescent dye to the system run on test then look round with a UV light to see the dreaded glow of a leak.

Hope this helps a little 

Golden rule when recharging after repairing a leak always weigh the charge in and never overcharge the system 

Trust me more refrigerant does more harm than leaving the system slightly undercharged 

Share this post


Link to post
Share on other sites

Funnily enough my car has just started exhibiting the same symptom, Mario. Recently recharged but I suspect there's a leak somewhere, as I don't beleive the compressor is running, as per Phil's post above.

Share this post


Link to post
Share on other sites

Thanks Phil for your interesting reply it helps a lot. I'll have to take it to a trustworthy garage to see what's going on.

Hi Arun, Yes that's annoying what with the weather improving, do you mind if I ask where you got yours re-gassed?

Share this post


Link to post
Share on other sites

All A/C systems will lose some gas over time.  If I recall correctly, assuming no faults, Lotus recommend initial re-gas of the system at 3 years - then every 2 years thereafter.  If you’ve run 5 years without servicing the system, then you’ve already done well.  

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...