There is another big reason why you want to keep your radiator cap in good working order and not drive around with a bad radiator cap. This lack of pressure sometimes stops coolant from your car’s expansion tank from moving back into your cooling system and it results in your radiator hose collapsing. All Rights Reserved. I have a 2003 Cadillac deville. Whatever the case, you should prepare to make the necessary repairs to your cooling system. Let’s learn more about what a radiator cap is before talking about some of the signs that you’ll see when you have a bad radiator cap on your hands. This helps to prevent the radiator from overflowing or having the radiator cap explode off of the radiator. Stant 10334 Lev-R-Vent Radiator Cap - 18 PSI. Additionally, the spring, plunger, and valves that are situated inside of a radiator cap can all go bad and stop a radiator cap from being able to maintain the pressure in a, If you ever find yourself with a bad radiator cap in your car, you’re going to want to have it replaced right away. I'm having troubles with my furnace this morning. Same truck as always: 92' Ford Ranger XLT with 2.9 V6, 4WD, auto transmissi... Hi all, have a 2002 pt cruiser. It’s also important because it makes it nice and convenient for you to add coolant to your car when it’s running low on it. Your radiator cap is a small part that plays a big role in keeping your engine from overheating. It may have caused a dangerous build-up of overpressure causing bursts or cracks which ultimately lead to leakage. As we just alluded to, there is really no telling when any of these things might happen. Quail cap problems, still. Always check the radiator/expansion tank when replacing a faulty cap. The radiator cap is actually much more important than that. The seemingly simple cap on it plays an important role in the radiator's performance. Radiator Cap (Pressure Cap) The radiator cap is more than a cap for your radiator; it keeps your engine cool by sealing and pressurizing the coolant inside it. If the radiator cap is too rusted then replace it for a quick and inexpensive fix. This is easily spotted by removing the radiator cap and inspecting the underside of it. Discussion Starter • #1 • Jan 19, 2011. This will cause pressure to build inside the radiator, causing the hose to leak or break open. But it won’t be able to do this if you have a bad radiator cap in your car. What is The Average Blower Motor Replacement Cost? Therefore, knowing the functions and symptoms of a bad radiator cap is a handy and straightforward DIY maintenance tip that you should pocket to maximize your engine’s performance and lifespan. I thought I had it fixed but not so. Once the coolant or water reaches the radiator cap it rises from the radiator, which allows the coolant to flow to another chamber. But before you can do that, you’ll need to spot some of the signs that will let you know that it’s time to have your bad radiator cap thrown out to make way for a new one. 0; Broken Radiator Cap. If you notice any kind of problem in these components, you should have these checked by a good mechanic. If the cap isn’t releasing excess pressure properly, that pressure can force the coolant to leak out at the point of least … Radiator problem of the 2002 Jeep Grand Cherokee 35. Even something seemingly as simple as your radiator cap has an essential job that helps keep your engine cooler than it would be otherwise. The pressure in this system is what allows the boiling point of your car’s coolant to be elevated, which makes it possible for it to remove heat from your engine and keep it cool. In addition to keeping the coolant in your car contained, the radiator cap in your car is also responsible for keeping your car’s entire cooling system pressurized. As the water or coolant boils it becomes compartmentalized within the radiator. by thom. Or you might have a radiator that’s leaking. Mercury Engine Repair Cost – Avoid The Mercury Cougar. But if your radiator cap gets to the point where you’re seeing any of the signs we just mentioned, it wouldn’t be a bad idea to have a mechanic handle replacing it for you. The radiator cap seems like a very simple device that has no other use than being a stopper for a hole. CPC Auto Components Radiator Cap SP05459 . A bad radiator cap can render the whole cooling system ineffective and cause costly damage to the precious engine. But those aren’t the only reasons why the radiator cap in your car is important. And one of the things you should look at is your radiator hose. 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