Thorlock was commissioned at Midland on November 13, 1944, and arrived at Halifax on December 16. On January 7, 1945, she left for Bermuda to work up, setting out on February 1 for the return journey northward. Later that month she was allocated to EG C-9 and on February 26 left Halifax to pick up her first convoy, SC.168. She served for the remainder of the war as an ocean escort, making five transatlantic trips. On May 12, 1945, when on the final leg of an Atlantic crossing with convoy ON.300 from the U.K., she was diverted, along with HMCS Victoriaville, to accept the surrender of U 190 and escort the U-boat to Bay Bulls, Nfld. She was paid off on July 15, 1945, and placed in reserve at Sorel. Sold in 1946, she served in the Chilean Navy as Papudo until disposed of for scrap in 1967.