Volvo XC 90 Owner's Manual page 217

NOTE
•
If there is not sufficient residual engine
heat available, this function cannot be
started
•
This function will be turned off if the vehi-
cle is locked from the outside in order to
avoid using residual engine heat unnec-
essarily. This function is primarily
intended for use when the engine is not
running but someone remains in the vehi-
cle
CLIMATE
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