Hey Guys, recently got myself a 97 R50 3.2 Diesel Terrano after my 94 D21 got stolen

- Man what a nice car, I loved the old terrano but the new one is awesome. Its like the fixed everything that anoyed me on the old one but kept the good stuff

Hard to believe it is the same motor as the TD27, just a bit reworked
Anyways, it has a switch marked "heat" next the the rear window switch on the dash. When flicked on it seems to give a fast idle until the motor gets up to temp, then goes back to normal idle. Anyone know if this is all it does and if it can be left on all the time?