non-freezing

She shivered in the garage while he spent half an hour in deciding whether to put alcohol or patent non-freezing liquid into the radiator, or to drain out the water entirely.

Sinclair Lewis - Main Street

An explanation of the non-freezing of the main Lake has been offered by several local "authorities" as owing to the presence of a number of hot springs either in the bed of the Lake or near enough to its shores materially to affect its temperature. But I know of few or no "facts" to justify such an explanation. I was assured that several who had tried had had narrow escapes from drowning.

George Wharton James - The Lake of the Sky: Lake Tahoe in the High Sierras of California and Nevada, its History, Indians, Discovery by Frémont, Legendary Lore, Various Namings, Physical Characteristics, Glacial Phenomena, Geology, Single Outlet, Automobile Routes, Historic Towns, Early Mining Excitements, Steamer Ride, Mineral Springs, Mountain and Lake Resorts, Trail and Camping Out Trips, Summer Residences, Fishing, Hunting, Flowers, Birds, Animals, Trees, and Chaparral, with a Full Account of the Tahoe National Forest, the Public Use of the Water of Lake Tahoe and Much Other Interesting Matter

The Golden Eagle's vacuum tank and crank-case were attached and a supply of non-freezing oils and gasolene drums, carefully covered with warm felt, taken on board. "Your instructions are," were Captain Hazzard's parting words, "to fly to the southward for a distance of a hundred miles or so, but no further.

John Henry Goldfrap - The Boy Aviators' Polar Dash : or Facing Death in the Antarctic