Hi guys
This is driving me nuts. FBH only seems to work when its mild, when its freezing it does not work. Put it into local steales last week for a service and to check the fbh. Told no problem with fbh, they only checked for fault codes. Anyway it worked like never before fanstastic, then I had overnight stay in hotel, frost next morning. It let me down.

Contacted stealers as im sure they must have done something to it. They guy who worked on it told me they never even looked at it just checked for fault codes.

We have not had a mild day since so Im just lost. Also understand that you can check it by putting a live feed on the slate/green wire and it should fire up. If this is correct I will put a switch in cab to make it work when its cold. Could it be the thermostat playing up behind front bumper.

Help please guts as its driving me mad.

Hi UK.. This morning whilst scrapping the frost off my TD4 I noticed the the fuel heater wasnt working...I would like some advise on which and where is the wire that can be found that will fire up the heater?...thanks...ED

Re: Fuel burning heater
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If you connect a +12v feed to pins 1 and 3 then the heater should operate. Pin 1 is the temp sensor switch which feeds +12v when below 5cPin 3 is for a 12v input from a timer switch. The pins are numbered on the 6 way connector. Hope this helps.
What 6-way connector do you mean please ? This info might be the solution for my problem. Since some years I was thinking if I could put a switch between either of the outside temperature sensor wires to allow me to leave the FBH switched off (as I do only short trips which ends up that when cold enough to have the fbh in operation, it stops only when I switch off the engine, in the garage, which makes I get a lot of smoke and diesel smell in the garage) and only allow it, by means of that switch, to get started when I intend to do a longer trip allowing the fbh to stop working as temperatures needed are reached. Was not keen of taking the whole bumper off to get hold of the sensor but if that connector is in a reachable place I could put the wire for pin 1 through that switch and back to pin 1 again ? Thanks.
The plug fits into the heater - however if you just want to enable / disable it then why not run a wire via fuse link 5 in the engine bay to a switch and back? You MUST ensure that the fuse is still included and that the switch used is rated at more than 20A or you'll have a very warm car as it will be on fire!
The safest way is to use a heavy duty relay to switch the supply from fuse 5 in and out.
hope this helps....i'm investigating time switches for mine at the mo so it can be on before i start journeys and nice and warm!

Thought this might amuse you.....

Testing the FBH I bought from eBay (didn't want to fit it and then find out it didn't work!):
- Holes cut in the bottom of a bucket, coolant hoses shoved through and silicone sealed
- Fuel pump cable tied to basket and fed from a fuel can
- Croc clips to battery
It heated the bucket of water in about 3 mins (faster than my kettle!!)

I can now say a few things for certain:
> Positive goes to pin-1 of the 2 pin connector
> Negative goes to pin-2 of the 2 pin connector
> Pin 6 of the 6-pin connector goes to the fuel pump (either terminal of the fuel pump, it doesn't matter which way around the pump's hooked up). Connect the other pin of the fuel pump to negative.
> Once it's all connected up, connect pin 1 of the 6 pin connector to the positive and hey-presto, the heater fires up! Disconnect it, and about 3 mins later the heater shuts down.
> Leave pin 3 disconnected, unless you want to run auto-heating.

I'm now off to figure out how to connect the thing into the coolant system.

Hi Uk..thanks for the excellent reply... do you have any pics on the location of the plug(s)...ta...ED

http://offroadbutikk.com/acatalog/Thermotop_C.pdf

try this wiring diagram,it also shows you how to wire up the heater blower.