Answer: Signs include reduced water pressure, unusual noises from the pump, frequent cycling on and off, water discoloration, and visible leaks.
Yes it can go bad without any leaks or noise. The impeller could be damaged, the shaft could be broken, or it could could be cavitated which would decrease flow. Normally though a bearing will go out and will cause a noise. This is most common.
Since you cannot physically inspect the impeller and inside of a water pump without removing the pump, the best way to know if it is functioning properly is to visually inspect the coolant condition, test the coolant pH and protection levels, test drive the vehicle to verify normal operating temperature, and squeeze ...
Repairing a water pump typically involves replacing the faulty pump rather than repairing individual components, as water pumps are generally sealed units.
A water pump replacement costs between $400 and $800 depending on the vehicle and the difficulty involved. Parts can run from $200 to $400, with labor services similarly priced. These estimates do not include taxes or shop materials, and disposal fees.
If your car's water pump goes out, one or more warning lights may pop up on the dash. For example, you may see the low coolant warning, overheat warning, or a check engine light.
The expected lifespan of a water pump is 60,000 miles to 90,000 miles, but many can last longer than that. Usually, once your car has reached the coveted 100,000 miles, you can plan on the need for a pump replacement soon. Sometimes, this cooling system part will give you signs that it needs to be replaced.
Install a new gasket and gasket sealer between the water pump and the engine mounting service, and install the pump. Reconnect all hoses to the water pump, and replace any brackets or accessories removed previously. Replace the fan, pulley, radiator shroud (if so equipped) and drive belts.
Driving with a bad water pump, especially if it's blown, is not advisable. Get a Professional Assessment: Once your vehicle is at the repair shop, have a professional mechanic assess the extent of the water pump damage and recommend the necessary repairs or replacements.
The time it takes to replace a water pump can vary significantly based on the type of pump, its location, and the complexity of your plumbing system. Generally, the replacement process can take anywhere from two hours to a full day.
When the water pump fails, there may be insufficient coolant running through the engine causing it to run too hot and overheat. This can lead to the failure of the engine gasket, cylinder head, and other components. If left unfixed, your engine could get so damaged that it requires an overhaul.
For the water pump, to test if it is operating efficiently, drain 1/2 the coolant from the radiator, feel the overflow tank and crank the engine and let idle. The coolant in the overflow tank will be sucked into the engine cooling system within 10 minutes. If it does not, the water pump is bad.
In some cases, the water pump can maintain this type of operation for weeks or months, or even longer, or it could fail immediately after by seizing up.
It works on plastic, aluminum, and metal radiators in heater cores, engine cooling jacket, gaskets (including head gaskets), water pumps, and freeze plugs.