Radiator cleaning fluids work a lot like drain cleaners: they dissolve the deposits so they can easily be flushed from the system. Because your radiator is made of thin tubes, it's the area most prone to blockage – and that causes your engine to overheat. Deposits start to build up in the numerous nooks and crannies. As a result, small particles pollute your coolant system, and you end up with a variety of gunk being pumped around your engine. All moving parts create friction, and though lubricants reduce the effect, some wear is inevitable. Many antifreezes contain corrosion inhibitors which help, but nothing stops the process entirely. While aluminum doesn't “rust” in the same way as steel, a chemical reaction called electrolysis means it still corrodes eventually. Modern motors use aluminum where possible it reduces the problem but doesn't solve it completely. Why do you need radiator cleaner fluid?Īny system with water in it is eventually prone to corrosion, especially when steel components are involved. It's about keeping your coolant system healthy and maximizing the life of your engine. You normally need a small mirror to see the weep hole on the bottom of the pump.You might notice little or no improvement in performance after a radiator flush. I still say failing thermostadt unless the water pump fails the pressure test. Back flush the heater core both directions.ģ) If flushing fails to remove blockage from core, core needs replaced.īut your big concern has to be first why is your engine overheating. If one is cold, either obstruction in one of the hoses or the heater core, or heater control valve is shut. You have some flow with it in the coolest setting(a/c off).įrom Service Manual: If air from vents is not hot: Causesġ) Thermostadt stuck open, prevents engine coolant from warming up enough to carry heat to the heater core.Ģ)Heater hose blocked. When you ask for heat inside, the valve opens and allows hot coolant to flow through the heater core and provide heat in the cabin area. You do have a heater control valve, vacuum driven. Same thing for A/C, but from evaporator instead. When we turn on heater, an valve actuator send hot air from the core to the cab. This was replaced by an air valve actuator.
About the heater valve, I think it's a very old technology (in 70s-80s).
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