Skip the auto shop - Our mechanics make house calls

Q: water pump replacement. 2011 Buick Lacrosse

asked by on

hi. i have a quote for a water pump replacement. 2011 Buick Lacrosse. Does Also, I'm leaking fluid. the dealership says "we think it's the water pump because of trace fluid found near it". The pressure check evidently isn't finding a leak and yet my car is leaking pretty badly. it actually seems to lose the fluid after sitting and not cranked up. Any suggestions would be grateful.

My car has 46000 miles.
My car has an automatic transmission.

Hey there. It does sound as though you need a water pump. Water pumps have very different sealing methods than every other component on your car. This is due to the rotating nature of the pump and the pressure in the cooling system. It is one of the most well known detail in the automotive industry that a water pump will leak when your car is in the process of cooling down or when it is cold.

As the motor warms up, it builds pressure in the cooling system that seals the front water pump seal. When the car is shut off, the water pump front seal will cool faster than the rest of the car and this creates a coolant leak. Its seems hard to believe that it would be able to leak a lot and then not at all, but they frequently do.

When a technician pressure tests a cooling system, it is simulating a hot cooling system. The same situation that the water pump is not leaking. When they do a visual inspection, they will see dried coolant coming from the water pump weep hole, but no actual coolant leaks.

This is a classic scenario that is very common. Rest assured that if my interpretation of your situation is correct, you will need a water pump replacement.

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

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 turn signals are not working, could you please tell me where the turn signal flasher fuse is located?

Hi, thanks for writing in. I would recommend checking the fuse first. If the fuse is good in the fuse box, I would then check the flasher relay which is located on the firewall behind the glove box. You may...

Q: In 2nd gear, car feels like it might independently shift

Hi there, thanks for writing about your 2011 Audi S5. Your vehicle's transmission has 2 clutches that alternately engage and disengage, under computer software control, as the vehicle accelerates and decelerates. The software compensates for wear in most cases, but...

Q: Car wont accelarate

Hi There, If the catalytic converter was not replaced it may be possible that in the event that it is clogged bad enough, it may still be continuing to force the car into a "safe mode" which is what happens...

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.