[quote=""mcc05""]ChewingBacca
Ok checked my air con unit part number is 64116916646, with acording to RealOEM, same as yours not the one for cars with aux heating, which as mine works leads me to think that the diff part number only indicate coding data.
As for unplugging the valves, I got errors but not the same as the one you get (I got left/right valve error), this could be because the valves are totally not there so can't report back an error. I would think is your case the valve unit must be reporting back a failure.
Mark.[/quote]
RE : "21 [033] parking heating locking valve . latent heat storage system . cut off valve"
As I could not reproduce this error by disconnecting the water valves , I did some more digging and traced the AC wiring diagrams online.
Turns out that even though I can't find this on any RealOEM picture or confirm its on my car, as it looks like an underneath the engine bay trip and its raining here, theres apparently a locking valve controlled by the AC unit for independant heating that switches the water flow I presume to only parking heater function.
I wonder if this could be the source of your problems.
(Taking my X5 in the garage Monday to do a rear bush replacement, so if I get time will take a look for this mysterious valve, pull it an see what error I get.)
