I'm in the middle of doing the heater in my daughter's Disco 1 - surprisingly easy to remove based on the info provided elsewhere in the forum.
The problems have arisen from the butchery done by someone else. They'd cut one of the pipes off with a hacksaw about 4" from the heater core and damaged the other one. That meant getting two new pipes plus the core plus the clips and clamps, etc.
The biggest hassle was getting the old pipes out, the pipe clamp screws at the firewall end are not accessible from under the dash, they require the heater assembly to be removed., A simple design change by LR would have made the job easy and have made no difference in assembly at the factory.
Anyway I got them out without damaging anything and have modified LR's design so it will be easy for any future replacement.
Tomorrow I'll reassemble it. I think my mod will also make getting the O-rings and pipes connected much easier


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