I'm in the middle of replacing all coolant lines, transmission cooler lines, alternator vacuum pump oil seal, flushing transmission cooler, intercooler and radiator along with replacing that fuel hose that goes along the top of the inlet manifold. This all started as a simple task of changing coolant hoses. In the process I've discovered that the power steering lines below the radiator are made from cheese and are corroding. I've taken the lines out of their holders and sanded off the loose corrosion. Taking the whole thing out and treating them seemed like a PITA so sanding in place and a spray with Penetrol should give them a longer life. Penetrol is supposed to handle 150 degrees C and I've had success in the past with this stuff. If you haven't removed your radiator for a while I'd suggest you take a look at your power steering lines before they start developing holes due to corrosion.
I have seen this on other 4wd's to. The pipes are not painted or treated properly from factory. pretty poor really. Manufacturers generally give their vehicles a 10 year lifespan. Why would they need to prevent anything?
Land rover is a great example of the 10 years I mentioned above. At 10 years I could count at least 5 pipes and hoses that would have rubbed through by now and a few that didn't make the 10 year mark.
My Disco is a 2004 model. 240,000km and the coolant hoses and oil lines are looking soft and develop very small cracks when the rubber is squeezed. The drivers side transmission cooler line was weeping very slowly from the fitting at the radiator. I'm going to go into Loadtek to get new replacement hose swagged on Monday. I'm guessing the Quick-fit fittings have an internal o-ring that can be replaced too. The transmission cooler and the intercooler have been filled with white spirit for the past two days.
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