In anticipation of 5,000 miles in the next 2 months and the forthcoming respray and general tidy up of my car, I've decided to do the odd little niggly job that I've thought about for a long time. Things that work but had an outside chance of needing attention at the side of the road if I was unlucky. One of these was the hoses to and from the throttle body heater. On the GEMS, and I suspect the Thor is much the same, there's a short pipe that runs from the inlet manifold to the heater and another long one that goes from the heater back to the coolant reservoir. When I had it all in bits rebuilding the engine, these needed a bit of attention. The short pipe had split and been shortened at some point and was only just long enough and the long one is a hard plastic pipe with hose on each end so it could fit onto the heater and reservoir. The hard plastic had gone brittle so cracked when I moved it and the hoses on the ends were looking a bit dodgy too. Unable to find any 8mm inside diameter coolant hose, I'd used fuel hose and had a couple of joins in the hard plastic bit too. It worked but I recently found that fuel hose isn't ideal. From previous experience I knew that you can't put fuel through coolant hose as it dissolves it but figured the other way round would be OK. It isn't. It isn't intended for the sort of temperatures so goes very hard and inflexible. Originally I thought about replacing the hard plastic with 8mm copper microbore pipe but would still need some 8mm inside diameter coolant hose for the ends. So why not replace the lot with one run of hose and avoid any joins? Finding something suitable wasn't easy but I ended up buying a length of this stuff http://www.autosiliconehoses.com/silicone-hose-shop/performance-silicone-hoses/silicone-1-ply-radiator-heater-hose-up-to-30-metres.html. 8mm inside diameter silicon coolant hose.
The short run from the inlet manifold was no problem at all, it's nice and flexible and pushed over the flared ends of the metal stubs at both ends easily. Initially I ran the longer one by the same route as the hard plastic so it ran along the front of the engine under the big metal thing that holds the wiring loom away from the serpentine belt, but it is so flexible that there was a danger that it could move forward and touch the back of the belt. So I re-routed it to run under the back of the alternator. A nice straight run and not in danger of being caught in any moving parts. 10mm I/D hose could also be used to replace the breather pipe from the top of the radiator, the one that seemed to be different on every car we checked at the summer camp. It's not cheap but seems to be good stuff and was delivered next day.
Next job is the headlining followed by the respray.......