Yesterday afternoon in preparation for travelling back to the UK from our place in France I checked the oil level & tyre pressures then thought I would have a go at trying to sort out the airlock in the cooling system that I think is the cause of intermittent heater problems. It seems to start off OK but after 45-60 minutes of driving the air blowing into the cabin gets cooler & cooler till eventually it's just external air temperature. As per RAVE instructions on refilling I disconnected the radiator bleed hose at the radiator then lifted the host to my lips to blow & clear any residual coolant whereupon the hose snapped in two places. The 20 year old plastic tubing was presumably flexible when new but is now the consistency of dried pasta so easily shattered.
An initial attempt at repair served simply to prove that gaffer tape does not provide a water tight seal & would not take pressure in any case. There was some urgency to effecting a repair as we planned on leaving the cottage at about 07:30 the next morning to catch the ferry at Saint-Malo approx 120km & 1 hour 20 minutes drive away. Remembering also that it's a Sunday afternoon in France & no DIY or motoring spares place or indeed anywhere else is open.
My initial thought was just to clamp off the outlet from the radiator in some way but before deciding on that I decided to Phone a Friend & ask for advice. @Gilbertd who himself was driving through France but hundreds of kms away advised me that this was a bad idea. If I had thought it through better I would have realised that the whole point of the bleed hose is to vent air trapped at the top of the radiator. He called me back a little later to suggest that if I had some reinforced hosepipe & the necessary fixings that I might be able to secure the hosepipe over the short rubber hose connectors at the radiator end & expansion tank end. I improved on that suggestion by using a 1 inch stub of the pasta-like plastic tubing to stop the rubber hose collapsing. I had bough 50m of reinforced hosepipe during the summer which was about 30m more than is needed in our garden so I had plenty of spare to cut a length from. My neighbour had one jubilee clip of the correct size & I was able to repurpose a plastic fixing that had held a water bottle holder on a bicycle to fix the other end. I tightened up the fixings tight enough to make a seal but not too tight so as to shatter the inner tube & collapse the rubber hose.
I allowed the engine to idle with the cap of the expansion off while intermittently topping up with coolant. Once the engine got almost up to normal running temperature & there was no more space for adding coolant I screwed the cap on tight. The hose didn't bulge excessively nor did it leak. I drove off to our local garage to fill up with fuel (see my previous post) a round trip of about 15kms. On my return the heater was working well & the hosepipe while flexible was not too swollen & the system was up to pressure as evidenced by the almost incompressible top hose on the radiator & the hissing as I gently released the cap on the expansion cap a fraction.
This morning we drove off in the dark & while I anxiously kept an eye on the coolant temperature for overheating & the bonnet for any signs of steam we covered the 120kms in good time. The heater worked fine for the entire journey. I am now sat in our cabin on the ferry while we make the crossing to Portsmouth. I had a look under the bonnet prior to boarding & the hosepipe looked OK so fingers crossed it all holds together for the second half of our journey of 3 hours & 150 miles from Portsmouth to North Essex. I've got a few meters of spare hosepipe in the boot just in case & have a 5L container of water.
I will update this this post in the evening.
Manningtree, UK & 22320 Saint-Martin-des-Près, France
2001 Range Rover Vogue 4.6L