Patent ID: 6938675

Claim:
A heat exchanger comprising: a plurality of first tubes made of metal in which a first fluid circulates; a plurality of second tubes made of metal in which a second fluid circulates; a plurality of third tubes disposed between the first and second plurality of tubes; a pair of header tanks made of metal communicating with the first tubes, the second tubes and the third tubes; and two separators made of metal disposed in each of the header tanks to divide a chamber in each of the header tanks into a first space communicating with the first tubes and a second space communicating with the second tubes, the two separators defining a third space between the first space and the second space communicating with the third tubes; wherein the two separators are joined by brazing to a respective header tank under the condition that the two separators are inserted from a slit hole formed in the respective header tank; a hole for communicating the third space with the outside of the respective header tank is formed in the respective header tank; and there is no fluid inlet or outlet associated with either of the third spaces.