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Just a quick update: this system performed like magic over the winter. I also installed a mains heater but didn't use it even once - the hydronic heats the engine in about 20 minutes on the coldest of days. It was great not relying on mains power when I was out hunting and fishing. Life is good!

Good point, I never thought of that. Bending the seat box flange was pretty simple too, but your double gasket solution leaves it unmolested. Cheers

Weird. I've got 265's on both my 300Tdi's and one reads 10 mph over at 50mph and the other is spot on when compared to my GPS. So with stock tires both my speedos would have been out, it's just chance that the bigger tires on one took up the error. On the other with 20% overread error, seems...

Now that I am done rambling, feel free to jump in and comment or add your pics and installation details for others to have a look at. I look forward to hearing your ideas!

Finished Airtronic Installation (kind of) Finsihing the installation requires routing wires for the controller and thermostat (pics 1 and 2 below) and installing the fuel lines and fuel pump. This is the same process as the Hydronic description above so the details are not elaborated again...

Drilling the Holes for the Exhaust, Inlet and Fuel Because it is such a tight fit, make sure you dry fit every component before drilling. Bending the flanged lip (shown in the photo attached) will give you more room. Note: two 1" holes are required for the inlet/exhaust, a 1/4" hole for...

Behind Middle Seat The heater is out of the way behind the middle seat but every installation location will require compromise, it's just a matter of preference. With the heater behind the mid seat, there isn't room for the jack base or the bracket. Remove the jack and drill out the two...

Hydronic Installation... Continued Wiring and Controller Note: I won't get into the wiring details too much because the Eberspacher instructions are excellent. Here are some of my thoughts on wiring: The wiring harness is really long. It can be cumbersome to route so I cut it down to...

Hydronic Installation... Continued Diesel Fuel Supply Note: Most hydronic heater have an internal fuel pump - unfortunately mine did not so I that is one extra thing to install. If yours has the internal fuel pump you can skip to the fuel stand-pipe installation below. Fuel Pump...

Hydronic Installation... Continued Eberspacher Exhaust A 1" hole saw is required to cut the hole in the battery box for the exhuast exit. The most likely place to run the exhaust is straight down through the floor of the battery box. DON'T DRILL ANY HOLES THERE! I started to and then...

Hydronic Installation... continued By the time my new heater came in the post I had already done a lot of looking around the truck for a better spot to install it. The battery box was looking better and better. I sized it up and with carefull installation I could still get the heater plus...

Eberspacher Hydronic Installation Where to install? Must be installed below engine minimum coolant level, but the lower the better. Need to consider: length of coolant lines for loss of efficiency; protection from road grime wading ?? ease of access for removal for cleaning / repair...

My first post! Hopefully it will be usefull to some. In the Canadian winter the defender needs an engine pre-heater to start, especially in Northern Alberta where -40 is common. SOOO a pre-heater is not a luxury, it's essential...but then once you get the engine going, the interior is...

There's a really simple solution to all this that you have overlooked: Keep the landy as is and get rid of the missus.

Hey Gents, I just fit an eberspacher hydronic D4WSC coolant heater in my 94 Defender 90. Now I am looking for a D2 airtronic (air) heater. I'm from Canada and have grown up on ice and snow, and this is what we do: -block heater -electric fan and rad muff - get rid of the constant running...