Question about Pontiac Bonneville

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I have a little water leek from a small pipe under where the heater hose pipes meet the top of the engine could you tell me what it is it only leaks when the engine is cold my car is a 2001 pontiac bonneville

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It's a thermostat bi-pass and not uncommon to rust especially if the anti freeze coolant has not been changed on time. some can be changed some are part of the water pump, if you do not have a repair manual go to your local library and see if they do. Other wise the book stores especially used one, all carry them. The one I like,is called auto repair for dummies, they have pictures as well as an easy to read format.

Posted on Sep 29, 2010


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My 2001 Terracan highlander has coolant leaking under the engine.Can someone tell me where the leak is coming from and how to fix it? The car has a v6 3.5l engine.

Could be welsh plugs on side of engine are corroded.
Could be a smaller pipe like a heater hose pipe or an auxilary cooling pipe .Had one of these little extra pipes on a mitsubishi sigma under the inlet manifold that was leaking.
Did you use a coolant in the engine as water can corrode welsh plugs in engines as I found out on my car !.

Jun 11, 2016 | Cars & Trucks

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I have a hose leaking water it is located just below the connection of the lower radiator hose at the connections of the engine - i need to replace the hose and its in a very hard to reach spot - what is...

FWD car blues...... what engine option?
if you cant reach the clamps with simple accesory parts removal.
then its FWD blues. front wheel drive, ,
id say check the FSM. or for how to do this.
there is no magic here, how to reach things, depends on persons size too. so.?????
did you look under the fender for access plates? behind tire>

the parts list on line at honda tell you the names
ever look there, water hose. bypass, heater, etc.>>>.

on some cars some hose are very hard to replace.
some even need the alternator pulled. or other parts .
for sure not the whole engine.

there are only 6 hose (water) small on the engine
3 bypass hose below the Throttle body. &1 at middle of long pipe.
long steel water manifold. pipe.
and 1 larger at from block to heater valve
and 2 larger going to , heater,

did you ever click , the water hose name here?

Sep 24, 2013 | 1995 Honda Accord

2 Answers

I have a leak and cannot find where it is coming from!? Could it be coming from the water pump?

Yes its likely most water pumps have a small hole on the under side of them called a weep hole. Its there to let you know that the seal is starting to leak and the pump needs to be replaced before it completely fails say on the highway and dose a lot of damage to the engine If its coming out the bottom center of the pump shaft and just driping a little then its time to replace the pump you should be able to feel the hole with your finger

Jan 11, 2011 | 1996 Mazda 626

1 Answer

I am seeing water behind the pump on the top of the motor in the v under all the fuel injection / intake is that normal for water pump to leak there if its bad?

its not normal. the water pump will leak in front, not back. There is a pipe and hose down in the VEE that can leak. If the pipe is bad, you will need to remove the pump to replace it. The intake manifold will need to come off, to replace the pipe/ hose. the hose connects a pipe behind the water pump to a pipe at the rear of the block to a heater hose.

Dec 12, 2010 | 2000 Ford Expedition

1 Answer

Water leak, appears to be from small hose, but can...

is it near the top? its likely the heater core routing pipe, runs accross the top of the engine. very common problem

May 20, 2010 | 2000 Ford Windstar

3 Answers

Seat Alhambra 1996 1.9L water leak drivers footwell

the water can travel along surfaces or beams in the car so you cannot tell where it is actually leaking. in my ford windstar water leaked in right over the fuse box. it ran along a cross beam from the passenger side. if it has those plastic strips they use to go in between small gaps in the metal... like along the roof where the roof is and the metal of the sides joins it is likely they are leaking. best to take a garden hose and have someone inside the car with a flashlight on the floor looking for leaks

Oct 22, 2009 | 2004 Volkswagen Touareg

1 Answer

Bad leak from little 2 inch L shaped hose next to lower firewall

its either the hose,or the heater core.
the core can crack where the pipes meet the core and
if you can smell antifreeze in the car and the windshield fogs,it is the core....the hose can also crack on the inside of the firewall and get misdiagnosed as a heater core.
big job,the dash has to come out

May 11, 2009 | 1996 Pontiac Grand Am

2 Answers

Water Leak

I have a 2000 that did the same thing. There is a small pipe that comes through the firewall to drain water from the air conditioner coil inside. The water comes out of that pipe and wicks back into the inside. They make a little extender to put on that pipe to take the water away. I fixed it by attaching a small hose to the pipe and putting a little goop around it where it comes through the fire wall.

Jun 30, 2008 | 2002 Oldsmobile Silhouette

1 Answer


  1. Sometimes the steam from under the hood, because it is over heat.

  1. Check the water hose include the heater hose, it is a smaller hose behind the engine on the top near the back of the hood, find out which hopes is leaking.

  1. If the hose is OK, check the freeze plug on the engine, because if the engine is too old, maybe the plug was rust and leaking, when it’s leaking, the engine is hot, you will see the steam under the hood.

  1. When engine is hot, you have to be very carefully, do not open the water cap, if you want to open, you have to either wait a while or use a heavy towel to cover the radiator cap, then open it.

  1. Maybe the radiator is leaking.
I hope this can help you a little bit. good luck.

Jun 24, 2008 | 2001 Chrysler Sebring

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