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D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
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#1
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HVAC - AC not blowing ice cold.
Hi. I should have noticed this before, weather not being warm enough, but my HVAC unit or the AC bit is not blowing ice cold.
I have: Checked fuses - no issues Run a scan on the HVAC unit - No codes present Visual inspection - all seems good - no loose connections Cycled through the options, switching ECON on or off does not not seem to indicate any changes to the compressor. I checked the compressor fuse (drivers footwell) and that is OK. Are there any other connections I should be looking at?
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#2
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Hi Paul
If the compressor is not kicking in and the fuse is ok then my VERY limited understanding suggests either the gas is low/flat or I seem to remember if the cooling fans aren't working then the compressor won't run. Hope that's some help. Steve
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2010 D4 SE Executive 4.2 TDI |
#3
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Is the compressor spinning?
Is the electric fan on? Is it cooling at all? Condensation on the pipes past the header tank? Is the centre vent switching between hot and cold? If it'll switch ECON on/off then the HVAC unit thinks there is enough gas, which comes from the pressure switch on the evaporator. Its becoming increasingly common for the valve blocks to fail and allow hot water through constantly, meaning even if the AC is running ice cold, you still get a face full of hot air. Marcel and I are working on a solution for this which is not tested yet. |
#4
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Quote:
Is the electric fan on? Yes, running fine. Is it cooling at all? Not cooling at all, fan on high speed. Condensation on the pipes past the header tank? No condensation, pipes appear to be warm to touch. Is the centre vent switching between hot and cold? No discernible difference when switching from warm to cold on centre vent. Am I looking at Valve block replacement or finding a learned AC person?
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! Last edited by strummagnet; 18th May 2023 at 07:45 AM. |
#5
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Well this became odd. Sort of.
Took the car in to be checked out and it was found there was very little gas to recover from the system. Lines were checked for leaks and none present. Refilled and has been ice cold for the last 24hrs with all controls working. Sorry if I mis-directed you chaps.
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#6
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Quote:
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Autos Autos everywhere... (1) 2015 Tesla Model S: (was 85D, now 90D ). Silent and deadly, and very fast... But not as fast as Ian's M3P- (2) 2002 D2 S8 Final Edition: Bulletproof and faultless: Brilliant Black with Extended (Red!) Leather. Three-times winner of Best D2 1st prize (3) 1997 Fiat Coupe 20v Turbo: Scots (! ) Green. Fragile, but beautiful. (4) 2010 Fiat Panda 100HP. White Pandamonium (Final Edition!!). Pure old-fashioned 6-speed go-karting. |
#7
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Vexing because it had numerous new parts and seals. It might need some dye injecting and then going over with a blacklight to see if the leak is visible.
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#8
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Sounds a bit like my D4, tested ok for leaks but only about 70g of gas recovered. Refilled to I think 780g.
Glad you're all sorted.
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2010 D4 SE Executive 4.2 TDI |
#9
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Quote:
Hopefully that's sorted it. The 'Aircon' chap said there were no 'discernible' leaks but it wasn't fully tested.
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#10
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I'm sure there was somewhere in the measuring blocks where it gave the refrigerant pressure value, but can't find it. Something similar to this video from the 22 second mark:
https://youtu.be/H9wJNAJBcvI?t=22 Turns out, if I switch my ECON off, the engine stalls. I'm hoping that this is because there is no gas in the system (after having the front off), and it just needs pressure tested and regassed, and not issues with the compressor.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
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