For the pipework, it's the nylon return pipes that are required, especially the one from the pressure regulator to the firewall. As already said, there is further hacking, so the complete set back to the reservoir would be good.
The operational return is the metal pipe from the FDV, which is sound.
On Ahmad's car the shuttle "T1" in the pressure regulator is missing, so all fluid is returning to the reservoir via the leak off/atmospheric return, which should only see a pulse of fluid as the shuttle changes direction.
The reason I suggest obtaining the FDV as well is that the regulator doesn't directly control the return flow, it actuates the shuttle in the FDV which returns the fluid to the reservoir.
Due to the regulator not building any pressure, it's not known whether the FDV actually functions yet.
FDV connections shown in attachments.
For the fan wiring, the fan does actually run if controlled manually, by a switch, but the blue connector for the radiator fan switch and a section of wiring are missing, as is the relay behind the left headlamp, hence the complete front end wiring would be useful.
No problem boiling some water for a cup of tea though...
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