> Indeed the Xantia doesn't have an electric heater. So when I do it in the
> way you suggested I think the oil will stay at a low temperature for a long
> time.
.. I don't know, that will only be true, if the heating circuit
is actually closed off when you turn off the heating. Many modern
cars just don't let the warmed air reach you, thus saving the
costs for a 'real' heating valve. If this is the case with the
Xantia, the motor temperature won't be affected by the way you
use the heating. But someone with more insight into the heating
circuits should step in here...
With my former car, I had to leave the valve (a real one) closed
until the motor started to warm up. But that's a different story.
> Is it possible to build in an electric heater aftherwile?
These are heating resistors in the cooling liquid hoses. I don't
think it's easily possible to add them...
> Now the temperature outside is about 5 celsius and I have to drive more than
> 10 kilometers before the oiltemperature raises till 80.
..do you have an oil thermometer? I don't, but with the
Berlingo, it takes up to 15 km (at about zero °C) till the
thermostat opens to the actual cooler circuit (visible by a
noticeable drop, then slow rise in the water temperature
display).
> Maybe I have to buy a waterheater like they use in Sweden?
If you're usually parking near a power plug at night, that could
be quite a good investment.
Look at http://www.defa.com/heating.php3, for example...
Hartmut

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