[PDF] Heaters - Parker Truck Hydraulics Center 1 For on-highway trucks, assuming all tractor lights and blowers are on. Use of more coolant fuel heater, but it also offers coalescer and filtration options that Fuel Filter/Water Separator With Heaters: exchanger to heat incoming fuel. The 300RC Series features high Coolant/Fuel Heat Exchangers - Plantoil/diesel conversion Jun 29, 2006Coolant/fuel heat exchangers do exactly what their name implies. They take heat from hot coolant and transfer it to the cooler (VO/PO) fuel. Since coolant heat is essentially waste heat produced by the engine transferring some of this "free" heat to the VO.(which must be warmed to lower its viscosity). is the most efficient way to accomplish this.
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