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Thanks to Dave this morning for his time and a cuppa :) Good to meet someone who actually knows these systems. And met with a mech who confirmed diagnosis ... Neither knew of Clarice's whereabouts though

Thanks again for the reply. Learning curve again. Which piece of kit in my pix is it? The one with the Prins label on it? Yes, the top hose is rock hard but not ballooning. The system does seem to offer more Hisssssh! from escaping gas when I open up the coolant resovoir pressure cap than...

Dupe post -- mod'r pls delete

Yes. But when I'd run it on LPG with the fault showing (in ignorance) the top hose hadn't ballooned up as others in LPG woes' threads (with LPG leaking into the coolant) had reported. But it was very hard Is Vaporizer the same as Reducer? If not, which is which in my picture above? ...

Did the 65 mile round trip to the Merc mechanic's workshop yesterday, motorway light foot max 65mph on petrol. iCarsoft continuously connected measuring coolant temperature showing 229ºF (109.4ºC) without variation. Checked that when going up a hill and down variation + 10º max. Dash temp...

Yes, a previous owner was either an enthusiast or had problems like what I'm trying to fix. A previous mech said that he'd recommend next change the electric thermostat as an attempt to cure. When I'd already asked them to change that plus the ECT sensor plus the resovoir cap. And they just...

Only 11 years later... but was it the Vapouriser?

Just been out to attempt (with an LCD display that has missing pixels) access and read the "hidden" menu. I can de-cypher "Check Control OK", and "Test N?01" I then push the left button and get "FGSTN?¦: A13042׀ I've read that to mean totalling 10 as I don't know what the last calligraph...

Thanks again for your experience & insights. Most useful :rolleyes: The engine fan on my M62 is just the viscous-coupled one. I've already had the viscous coupling changed for the BMW M62 equivalent one. Today will see some definitive driving tests to confirm whether this fault is showing...

Because of your and this forum's support I will not be beaten -- well, not by an L322 anyway :mad: Driving around lightfoot trying to find a shop with the gas-in-coolant detector kit (Halfords Crayford, plus Dartford, and Plumstead olde style parts shops = nothing) this symptom only ever occurs...

Ah, right. I should've known that. Silly me :confused: ... every day I'm getting better, and better, and BETTER (film, yes but from which film?) ;)

Decided discretion was a good idea so cancelled my appointments in MK -- no sense in risking a warped head -- I've already got one of those

Will try that. But if that's shown on the LCD display fear might not see much as a few pixels are not working so only about ⅔ of that display is actually de-cypherable <later> well have gone thru what's available both on the HUD and the LCD and can't find any display that's giving a running...

Yes, I haven't changed the water pump. But previous keeper did list it in his list of things he'd done (now three years ago but that was in his sales blurb :p) Merc mech says water pump's OK though. Apparently these sort can be checked if there's play felt by woggling the shaft from side to...

Followed this recommended procedure (the above video) from: Took out from Blackheath to Plumstead light foot all way crawl heavy traffic and behaviour was solid staying at ½ FSD. Coming back gave it some wellie on a quiet stretch of road and up hill -- after which needle went just over ¾ once...

Just completed above procedure, didn't see any of the tiny gas bubbles in the overflow from the expansion tank's bleed hole. Got to complete procedure just as temp gauge was nearly at ¼, slight warmth coming from heater vents. LPG had not yet switched on

I'll follow that vid to the letter -- thanks for bothering to post it, much appreciated. Just went out and heavans opened. Can't assume previous mech followed that procedure what with being a Merc head. But after getting back from Bromley and having the "up to ¾ FSD" experience just the once...

That's why I haven't heard any fan switching on/off then -- haven't had the aircon on since collecting the car back.:cool: Just been out again and the temp needle didn't even flicker from its half position -- didn't push it though, Saturday afternoon shopping traffic in and around southeast...

New ECT sensor fitted. So I'll check the three connections (ECT, electric thermostat, and supply to viscous-coupled fan) that I can reach, clean pins, give them a sqirt with non-oil-based contact cleaner. And report back

<later> Purge valve means evap system which again might be affected by having an LPG system fitted.