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My 1.1 carburettor engine has a small casting attached to the front / right of the engine that houses the connection to the lower rad hose, a temp sensor and a hose sticking out sideways attached to the heater. I have a small leak at the junction of the heater hose. Not much - just a couple of drips. I have tried moving the jubilee clip further up the hose a bit but this has had no effect. Since the hose and casting look OK - I haven't dismantled the joint - what can it be? Anyone else had this? Also I notice that no-one is advertising the heater hoses as it's quite a complicated arrangement of bonded hoses going to many locations.

it could be the hoses? I'd probably dismantle and have a look. could be a build up of crud inside?

sometimes hoses gets a small split round where the jubilee clip is tightened.
if this isn't the cause try tightening the jubilee clip a bit more
if this doesn't help, remove the hose and clip, buy a new clip of a good quality, clean the hose inside and wipe dry, clean and if necessary lightly sand down the pipe where the hose goes then refit the hose with a light smear of liquid gasket, this has always worked for me.

DotMatrix wrote: ↑Tue May 30, 2017 8:32 pm sometimes hoses gets a small split round where the jubilee clip is tightened.
if this isn't the cause try tightening the jubilee clip a bit more
if this doesn't help, remove the hose and clip, buy a new clip of a good quality, clean the hose inside and wipe dry, clean and if necessary lightly sand down the pipe where the hose goes then refit the hose with a light smear of liquid gasket, this has always worked for me.

And the cause was......a buildup of brown, lumpy, brittle deposits stuck to the aluminium under the hose - cleaned them off and re-made the joint, now OK. What a pig bleeding the system when refilling though! I followed the system of filling gradually whilst looking at the two bleed points but it took a good run to get the heater working again. What's next I wonder?

Yes bleeding can be a bit difficult. I usually leave the two bleed screws in and fill up to max with coolant, then bleed and then top up the coolant.