When it overheats, the remaining coolant boils and that just adds to the problem. First have someone run a cooling system pressure test. Follow this procedure. Install the pressure tester. Pump it up to 5 psi and see if it holds that pressure. It might. Then start the engine and watch the pressure gauge.
Goose the throttle. Does the gauge jump? The breech in the headgasket allows hot combustion gasses to be blown directly into the water jacket, adding more heat than the cooling system can dissipate, adding volume by adding gasses, and adversely affecting the ability of the cooling system to disspate heat.
The headgasket seals the oil passages between the block and the head also, and if an oil passage is involved in the breech it can allow movement of oil into the coolant with the combustion gasses. The breech will erode quickly and grow, the head will inevitably warp, and you rengine will be history. Below are common symptoms that may appear with a faulty coolant expansion tank.
As coolant gets hot due to it absorbing heat from the engine, the liquid expands and creates additional pressure in the radiator. As the pressure causes the coolant to get higher than the radiator pressure cap , the excess coolant needs to be captured somewhere in order to prevent leakage. So, the radiator coolant overflow tank functions to serve this exact purpose. The excess fluid flows into the overflow tube and goes into the overflow tank. Once the driver parks the vehicle and turns off the engine, the heat dissipates which causes the coolant to not be as hot anymore.
The coolant will then contract instead of expand; resulting in the volume of the coolant decreasing. This is kind of like a vacuum effect where the pressure decrease allows the excess coolant in the overflow tank to flow back out of it, so it can return to the radiator.
If the radiator coolant overflow tank is damaged or cracked, then you can expect coolant fluid to leak out of it. Sometimes cracks will form on the overflow tank if it is too old and worn out. You should notice small puddles or drops of coolant on your garage floor or in your driveway. Note: Coolant is very harmful to dogs and cats. There have been many cases of dogs and cats getting very sick or even dying because they ingested engine coolant.
In addition to the coolant leak, there will be an apparent coolant smell coming from the front of your vehicle. If it gets bad enough then it may even circulate throughout the cabin of your vehicle. So if you smell this warning sign, check the condition of the overflow tank and replace asap.
As a result, you can expect the temperature of your engine to rise and become overheated. This will be indicated on the engine temperature gauge located on the dashboard. If you check your coolant levels in the radiator coolant overflow tank and they are low, then you either have slowly evaporating or leaking coolant.
To confirm, you need to actually check the coolant level to make sure you have a leak. The overflow tank cap is often the cause of the leak. The radiator cap allows the pressure to build inside the engine as the coolant heats up until it reaches about pounds a typical cap rating. Since pressurized fluid boils at a higher temperature than room temperature fluid, that allows the system to operate a higher temperatures without boiling over. When the pressure exceeds the cap pressure rating, some fluid is allowed past the radiator cap and flows into the reservoir.
Then, when the fluid cools and contracts at the end of the day, the cap allows the coolant in the reservoire to freely flow back into the engine, keeping the system full even after the fluid has contracted.
The level in the reservoir will rise and fall as the coolant heats up and cools down. If the reservoir is filled too full, excess will blow out the overflow tube when the coolant heats and expands.
And put fresh fluid in there. Thank you everyone for your posts…The car is NOT over-heating at all, and the hoses are hooked up correctly to the reservoir tank.
I agree with your general consensus to change the radiator cap, perhaps the excess pressure is whats pushing all the coolant out of the reservoir.
BTW, i replaced the thermostat about 20k miles ago.
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