Skip the auto shop - Our mechanics make house calls

Q: Water pump issue

asked by on

If a very small amount of pink antifreeze is crystalized around the metal hose of the water pump leading to the engine, does this mean the water pump needs to be replaced?

My car has 40700 miles.
My car has an automatic transmission.

Most people wouldn’t say yes, it needs to be replaced. But the truth is, there is a bit of an argument within the industry about this. Before I go to far into that, let’s make sure we are clear on the form of leak we have here. I’m assuming there isn’t any liquid, only a crystallized stain at the water pump weep hole. If there is any wet drips or evidence of stains that indicate antifreeze has been running wet, then I would say the water pump should be replaced. Look directly below the pump to see if there is any evidence of a larger leak. A water pump seal is a unique seal that under certain circumstances will seep coolant. This is what you see in the form of crystallized antifreeze.

From my perspective, at 40,700 miles, as long as there isn’t any wet antifreeze dripping or pooling anywhere, I wouldn’t worry about it. Water pump seals will often weep when they are in the process of cooling or warming. This is more prevalent in climates that experience extremes such as snow or desert summertime temperatures. Water pump seals are spring loaded devices that are designed to work within the varying pressures that are normal for a cooling system. When the environment is extreme, it pushes these seals to their limit. I’ve seen vehicles that actually leak on warm up or cool down, but not when cold or fully warm. It’s not very often and newer vehicles have better designed pump seals, but the inherent weakness is still an engineering challenge.

I draw the line at wet weep holes or dripping. Even then, this is often a manageable condition. Short of running coolant out the weep hole at a constant rate, no matter the temperature, keep track of your coolant level. A weeping hole is not much more than a couple of drops of coolant. You shouldn’t be able to detect any loss from such a small weep.

Another detail that is important, but I wouldn’t expect to see on a 40,000 mile vehicle, is particulates flowing through the cooling system. If you see any evidence of small particles in the cooling system, this can damage the water pump seal and create leaks. If this is the case, I recommend a complete flush of the cooling system. In which case the best way to flush a cooling system is by removing the water pump and thoroughly flushing water through the block with a water hose. But I have never seen a 40,000 mile Toyota have such a problem, so this is doubtful.

If you need assistance and want a professional to take a closer look, a certified mechanic from YourMechanic can visit your home or office to inspect the fluid leak.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My car makes a cracking sound in the front while driving.

It sounds like you may have worn CV joints. the CV joints are the couplings on the end of the axles that allow the wheels to steer while under power. When they are failing they usually make a popping sound...

Q: stuck in 4 low

If the motor moves through it's range, there may be a problem with the transfer case. Try this first. When you switch from high to low range, gears have to disengage and reengage. When you are attempting to switch the...

Q: The Check Engine light is on. I know the vehicle needs a new catalytic converter.

If someone has already diagnosed that the catalytic converter is faulty on your vehicle and you know they are correct, that is the cause of your check engine light. Your oxygen sensors pick up more fuel in the exhaust when...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...