Auxilliary Heater

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Paul S. Brown - 23 Oct 2004 21:52 GMT

I've just been taking my "other car" - a Rover 75 - to bits and putting it
back together.

It has a diesel auxilliary heater - a Webasto Thermotop.

I'm trying to figure out what this particular heater does for a living -
whether it's an air heater for the engine inlet, or it's a water heater for
the engine as a whole

Any ideas?

I'm thinking about going and mugging my local scrapyard and see if they've
got any diesel Rover 75s breaking if this turns out to be a water heater.
The 75's just about new enough that there's some chance they'll have them.

P.

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Mark Pewsey - 24 Oct 2004 06:29 GMT

| I've just been taking my "other car" - a Rover 75 - to bits and
| putting it back together.
[quoted text clipped - 13 lines]
|
| P.

Hi Paul. If it's a Thermo Top it's a coolant heater, and you'll have
found that it was plumbed into the heater matrix, as well as a fuel
supply.

Idea is to heat the coolant so the heater works better, plus as the
engine warms up quicker makes it more responsive, efficient etc.

Does yours have the control plugged in so you can set a timer so it
comes on independent of the engine? If not, you can buy these and
retro-fit them.

Look at www.webasto.co.uk for more details.

Well worth having.

Mark

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Blippie - 28 Oct 2004 15:37 GMT

>Does yours have the control plugged in so you can set a timer so it
>comes on independent of the engine? If not, you can buy these and
>retro-fit them.

Would this work with the Freelander's TD4, I wonder?

Cheers

Blippie
--
Ten minutes of this rain will do more good in half an hour than a fortnight
of ordinary rain in a month.

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Mark Pewsey - 29 Oct 2004 09:05 GMT

|| Does yours have the control plugged in so you can set a timer so it
|| comes on independent of the engine? If not, you can buy these and
[quoted text clipped - 5 lines]
|
| Blippie

Possibly. Webasto Do the ThermoTop in two main flavours - plain and
ThermoTop C. Have deleted OP so no idea which one was mentioned before.

The plain one takes it's fuel feed from the engine's injector return
pipe and stores about 30 minutes worth in an internal tank.
This requires a low(ish) return pressure - fine for the old 110/90
Diesel Turbo, and 200TDi, but not for the Td5 which has a very high
pressure system. Don't know about 300TDi or the TD4 I'm afraid.

For the TD5 I needed the newer ThermoTop C version - it gets it's fuel
independently by having it's own pickup in the tank. Because it pumps
it's own it can run for much longer - standard timer control allows two
one hour burns instead of a single 30 minute one. On my current car (VW
Caravelle, sorry) it even has it's own battery and can run until the
battery dies or tank runs out).

Mark

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