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She's been using a bit of coolant recently, not sure how much if I'm honest. I should have been measuring it. There's definitely a leak on the LPG reducer and the head -> expansion bottle return judging by the pink stains. However, today she overheated and took 1.5l of de-ionised water before the levels came back.

I've noticed what I think is quite a steamy exhaust - do you reckon this is a problem? The video was taken with a hot engine at 0 degrees ambient, running on LPG.

Video of a P38 steaming gently to herself on a garage forecourt

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Did it puke out a load of coolant to lose that much? Out with the plugs to give them a look over can't hurt as a first check.

Hard to say on the steamy exhaust - if it were doing that after a run it would make me wonder. How long was it sat at the garage before restarting? The exhaust will cool off quickly when you stop the engine at a low ambient temperature, causing a load of condensation to build up when you restart and then boil off.

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There was no puking, I think it's been a while since it was checked. We lost cabin heat then ended up stuck in traffic -> overheat. I pulled over immediately and waited while my wife brought the water :) (she did insist).
The drove to the garage (1/2 mile?) and took the vid while waiting for the LPG pump.

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That amount of steam looks pretty normal in cold, damp conditions when running on LPG. Sounds more like you've got a number of small leak points and as soon as the level gets down low enough, you lose flow through the heater. Start looking for the rest of the leaks.

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Both of mine produce steam like that on LPG at idle on a frosty morning. I wouldn't worry about it.
I use this stuff in my cooling systems. Together with a UV torch it's really handy for locating small leaks where the coolant gets blown/ cooked off.
Good for outdoor parties too
http://www.ringautomotive.com/uk/products/Workshop+Tools/Leak+Detection/Fluorescent+Dyes/RLD2

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After my recent experience Morat, check your carpet and heater box lower parts/ trunking for coolant leakage. I'm assuming my failed Nissens matrix was a one-off QC problem, but you never know.