Review on Zerostart 3309040 Circulation Compressors Agriculture by Charles Lewis

One of these has been on my John Deere Bulldozer 450 for many years. It quickly heats up the entire cooling system and makes cold starts easier. I have block heaters with freeze plugs on a Massey 165 tractor, a Case 580L hoe and a Case 1840 skid steer loader. They take them three times longer to bring up to temp and even then the system doesn't heat them up as well as it does here. I have no complaints and honestly this is one of the best upgrades I've made to a bulldozer.