All Things Mk5 > How to Guides / Troubleshooting
Air con pressure switch - green coolant inside it?!
daelo:
So I have a faulty air con system I believe and think it may be the air con pressure switch after reading around on this forum and others.
Went to have a look to see i could find the switch next to the alternator. When I un-clipped it there seems to be a green liquid inside where the terminals are, thought maybe that is interfering with the connection so gave it a blast of contact cleaner.
It started bubbling, I cleaned it out as best i could with a wipe and flat screwdriver! So anyway images below, surely the switch should be completely sealed, is this indication that the switch is leaking which is throwing the fault and preventing the AC from working?
FYI , was re-gassed a few weeks ago, and it hasn't been checked on VCDS for fault codes.. yet.
Images before i squirted in the cleaner.
GVK:
Thats dye from the AC refrigerant. Switch must be leaking internally.
daelo:
Thanks GVK, assuming if a "high pressure" switch is leaking then presumably it registers low pressure and most likely isn't allowing the compressor to turn on?
In anycase, surely a replacement should be fitted?
GVK:
Yep, switch needs replacing if it's leaking.
daelo:
Small update for anyone following. Replaced the switch with the help of a crowsfoot spanner 17mm .
Still hasnt resolved the issue, however i'm thinking if the sensor threw a fault, would it need clearing with VCDS before it became functional?
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