Description
If you’ve noticed coolant disappearing without any obvious leaks or your engine running hotter than it should, your expansion tank cap might be the culprit. This little part has a big job—it keeps your cooling system balanced by controlling pressure and helping recover coolant as your engine heats up and cools down. When it’s not working right, you’ll lose coolant and risk overheating on those long field days.
What You’re Getting
- Calibrated pressure relief that opens at just the right point to protect your system
- Built-in vacuum valve pulls coolant back from the tank as things cool down
- Universal design fits most common agricultural expansion tank setups
- Durable seal that won’t crack or compress from coolant exposure
- Safety feature gradually releases pressure before you can fully remove the cap
Built for Real Farm Work
Modern tractors rely on expansion tank systems to handle the constant heating and cooling cycles of field work. Whether you’re running a utility tractor with a loader, working ground with a row-crop machine, or pulling heavy equipment with a high-horsepower unit, this cap keeps your coolant where it belongs—in the system, not on the ground.
Made to Last
The pressure spring is calibrated to open at the correct pressure, protecting your radiator and hoses from damage while keeping your cooling efficient. The vacuum valve does the opposite job, sucking coolant back from the expansion tank as your engine cools, preventing air pockets that create hot spots and problems.
Good to Know
Before installing, check the expansion tank neck for cracks or buildup that could prevent a good seal. Never remove any cooling system cap when the engine’s hot—even expansion tanks build pressure. Make sure this cap seats fully and locks properly, or it won’t do its job. After installation, check both your radiator and expansion tank levels. The expansion tank should be about a third full when cold, giving room for hot coolant to expand.
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