Q: Swollen coolant water pump bypass hose

asked by on

I have a coolant hose that I need help identifying. It comes from the bottom of the thermostat and appears to go into the block. The problem I have is the hose swole enough to strike a bolt close by and puncture it. I haven't had any cooling issues lately, but I did recently "fix" a leak I couldn't find by using some sort of cooling system stop leak.

My car has 150000 miles.
My car has an automatic transmission.

The small hose that comes from the bottom of the thermostat housing and has a small bend then goes straight down into the top of the water pump is called the water pump bypass hose. This is the hose you wanted to be identified. If you had a coolant leak and it stopped when you used the stop leak is most likely coming from the thermostat housing. The thermostat housing is made from plastic with rubber O-rings to seal in the coolant. The housings are known to crack and start leaking coolant. You would need to replace the thermostat housing assembly to stop the leak.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Swollen coolant water pump bypass hose

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: i have a Mitsubishi io 4g93 it only accelerates up to 1500 rpm and the engine is shaking what could be the problem?

Hello. Thank you for writing in. The vehicle is at an age where it needs to updated and maintained. The issue will hopefully be solved by performing some regular maintenance. Start by performing an oil and oil filter change. When...

Q: Engine coolant disappeared

The engine could have an internal coolant leak and the coolant is being consumed into the motor. This is is you do not see any leaks anywhere on the round or on the engine. I would recommend having a mechanic...

Q: Broken air conditioning due to leaking tube

I think you might have two separate issues here. The air conditioner "coolant" is a pressurized refrigerant that can only be installed with special equipment. The coolant that you poured in and had leak out of the bottom is the...

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...
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...