300 tdi radiator vent plugs?

[Debs.]

I`m fitting a single electric fan instead of the viscous unit; simply connected with a relay, fuse and a thermo-switch with a manual toggle-switch as a bypass/over-ride and test-check.

The obvious way to directly sense the circulating water temperature, would be to replace one of the vent plugs with an appropriately-threaded thermal switch.

There`s both plastic (on housing) and brass (on radiator) vent plugs; are they the same thread and does anyone know which is their thread type and pitch?.....Knowing that will help greatly at the motor factors.

Thank you,

Debs.

[K88 MUD]

IIRC....its 1/2"BSP....nothing special

[Range Rover Blues]

IIRC they are the same and X-Eng make a decent replacement. My LSE has an afermarket rad with a differnet fitting so worth checking first.

If you don't have air conn the thermostat elbow has 2 temp switches in it, or Wizard sells a decent adjustable switch with a capiliary that goes into the top hose. For a bomb-proof sealed solution again see X-Eng.

Another alternative, some manufacturers had "dry" switches on their radiators held on with a clip, can't remember who but a mate fitted electric fans to a classic car with one.

[Debs.]

Thanks for the replies, chaps: I`ll probably go for the easiest and cheapest way and simply use a 1/2" BSP threaded thermo-switch replacing the brass vent in the radiator.