Webasto

LR4x4.com forum member simonb has installed a Webasto Thermo Top C parking heater in his 300Tdi Defender. Unlike a cab heater it heats the engine coolant rather than the interior. It has the advantage of an instantly demisted windscreen and a warmed up engine for less wear, better economy and improved throttle response (cold Tdis are very sluggish).

The heater unit is mounted in the original washer bottle location. It runs from a split charge system - simple relay and a leisure battery.

Coolant hoses are a mix of Webasto and standard ones.

Installed in winter 2000, it is used every day even during the summer to preheat the engine.
A cut down Webasto bracket is bolted to the original washer bottle bracket, using M6 bolts and nuts as spacers.
Silencer, left hand chassis cross member at bottom, front inner wing at top.
The original washer bottle needs to be relocated or an alternative used.

There is a genuine LR washer bottle that mounts behind the headlight but is mega bucks. I got one from a Renault 19 instead and mounted it behind the drivers headlight. It has a neck that can be extended using 1 1/4" hose and plumbing fittings so that the neck can be relocated up behind the expansion bottle (300Tdi). One exhaust clamp holds the shortened neck of the bottle to the wheel arch liner, another holds the top of the neck to the edge of the wing inside the engine compartment (like the expansion tank).

Removing the black plastic trim from the wing top gives access to filler neck clamp nuts. Vent pipes are transparent hoses turning over in front of brake fluid reservoir. Attached with P clip to wing.
Side view and 1 1/4" waste pipe elbow used to connect to bottle.
The washer tank is just visible between the bonnet stay and fuel filter.
As the tank is now mostly horizontal, I used washer tube sealed with the grommets from the pump on the old tank to make a breather in the side of the tank to allow the air out as it's filled.
The fuel pump is under the drivers seat attached to vertical aluminimum angle bracket. Feed T ed into engine return pipe.