The excellent performance of the modern automobile environmental control system tends to accentuate the passenger discomfort experienced during the engine warm-up period in very cold weather. Quick-heat systems utilizing combustion techniques can significantly reduce this warm-up period and can not only improve comfort, but also contribute to safety and improved engine life. These factors are discussed, together with details of a quick-heat system which reduced the warm-up time of a large American automobile by over 80% in actual tests.
