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Microchannel heat exchangers are taken as a great area of research interest for their elevated heat transfer characteristics, higher heating surface area to volume ratio, smaller size, lighter weight, lower fluid inventory and energy efficiency compared to conventional heat exchangers with same heat exchange capacity. Though several investigations have been conducted to find out the air side heat transfer and flow characteristics of common compact cross-flow heat exchangers with various tube and fin geometries, the studies on air side thermal and hydraulic performances of microchannel heat exchangers are rare in open literature. In the present study, the air side heat transfer and fluid flow characteristics of a multiport microchannel heat exchanger in liquid-to-air crossflow orientation were investigated experimentally.