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.

A: Most people wouldn't say yes, it needs ...

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・Save up to 30%

Get a quote

What others are asking

Q: When I press the brake I hear a click on the passenger front.

You may be hearing the brake pad moving in the caliper bracket due to a small amount of rotor warpage and grooves. This may be okay if it is very minor, but I do not take chances with brakes since...

Q: Sometimes the truck will start and run just fine, and other times it will barely want to start and I need to press the gas pedal

Hello. This can be caused by a few different things. If the vehicle will run by pressing lightly on the gas pedal then it may be a bad idle control valve. If it sticks, it will allow too much air...

Q: Multiple replacements required due to popping clutch

Hey there, thanks for writing in about your 1992 Toyota Paseo. It sounds like there is some underlying electrical issue that is occurring. A loose or corroded connection can be causing problems in the ignition circuit. I would recommend having...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...