dodge promaster diesel about 55k kilomter first time I noticed in a cold day -10c. heating wasn't working I was busy heating guy. I know it cover up to 60k kilo. but have to leave my truck one day for diagnostic then go back leave my truck at least two days. then was ok for a while this 2017 winter around feburary problem comes again. cold day heating isn't working on and off.. some time whole days..now over 60k kilo missed warranty.