Snowmobile heat exchanger assembly

A heat exchanger assembly comprising:

• a front portion;
• a middle portion rearward of the front portion;
• a rear portion rearward of the middle portion, at least one of the front and rear portions being curved from the middle portion, the at least one of the front and rear portions extending below the middle portion;
• a top part;
• and
• a bottom part disposed below the top part and being joined to the top part,
• at least one of the top and bottom parts defining a recess,
• the top and bottom parts defining therebetween a passage formed in part by the recess,
• the passage having:
• a first portion of the passage extending along a first side of the heat exchanger assembly;
• a second portion of the passage extending along a second side of the heat exchanger assembly;
• an inlet fluidly communicating with the first portion of the passage near a first end of the passage;
• and
• an outlet fluidly communicating with the second portion of the passage near a second end of the passage,
• at least one of the inlet and outlet is defined in the at least one of the front and rear portions extending below the middle portion,
• wherein the passage is adapted such that fluid enters the passage via the inlet, then flows in the first portion of the passage in a first direction, then flows in the second portion of the passage in a second direction opposite the first direction, and then exits the passage via the outlet.