The X-Trail heating does appear pretty weak - I can only conclude it is down to a combination of factors:
1) The car only has front vents - and has a pretty reasonable volume to fill.
2) The car needs to held above 2000rpm for the heat to build into the cooling system
3) The car has a pretty large cooling system
Having just returned from a weekend in the mountains - I was able to confirm that the car needs to be kept above 2000rpm or the engine temperature drops.
1) The car only has front vents - and has a pretty reasonable volume to fill.
2) The car needs to held above 2000rpm for the heat to build into the cooling system
3) The car has a pretty large cooling system
Having just returned from a weekend in the mountains - I was able to confirm that the car needs to be kept above 2000rpm or the engine temperature drops.