AIR CONDITIONER FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To speedily heat a car room even on a vehicle mounting a high efficiency diesel engine etc., on it. SOLUTION: A compressor 7 is driven by connecting a clutch 8 when heating is judged to be insufficient only with a heater core 5 in accordance with cooling water temperature of an engine 22 to be detected by a water temperature detection means 25 in the case of driving heating by closing a third flow rate control means 14. At this time, the clutch 8 is cut off and it is displayed on a display means 27 by judging it as a failure when detected pressure at a pressure detection means 17 exceeds second standard pressure Ps2 before set time Ts passes after it exceeds first standard pressure Ps1. In the meantime, when it is judged that heating is insufficient only with the heat core 5, the clutch 8 is cut off.