Fluid sloshing sound in 97 silverado

[Tiger]

I have a 1997 Chevy Silverado 5.7l and for as long as I can remember, when I
take off in forward in the morning, I hear a sloshing sound of fluid running
somewhere under the dash. Of course, nothing comes out wet, and no levels
are low that I can tell, but what is that? It possibly sounds like the
liquid in the heater core. It happens whether the heater or the AC is on.
Is it bad? How can I stop it?

[Dean Dardwin]

Tiger,

You have air in the cooling system. Fill the radiator.

Dean

[Tiger]

I admit I do have a slow leak in the cooling system somewhere, but every two
weeks or so I check and top off the radiator and reservoir.

"Dean Dardwin" <d...@dxd.com> wrote in message
news:3C4F3E53...@dxd.com...

[Dean Dardwin]

Tiger,

Bingo! And if you don't get that leak fixed don't be real surprised if you end up having to replace the engine. The coolant may be going in the crankcase; Vortecs have a intake manifold gasket problem. Or, if the leak is external, you'll end up with enough air in the cooling system to overheat the engine. At a minimum you'll have to R&R the heads.

Dean

[Tiger]

Dean,
If this is a common problem, is it covered such as in a recall? The truck
has 60k miles on it so the warranty is over. If I will end up having to pay
for this out of my own pocket, how big of a deal is it to fix this intake
manifold gasket problem?

Thanks,
Clint

"Dean Dardwin" <d...@dxd.com> wrote in message

news:3C501E55...@dxd.com...
Tiger,

Bingo! And if you don't get that leak fixed don't be real surprised if you
end up having to replace the engine. The coolant may be going in the
crankcase; Vortecs have a intake manifold gasket problem. Or, if the leak is
external, you'll end up with enough air in the cooling system to overheat
the engine. At a minimum you'll have to R&R the heads.

Dean

Tiger wrote:

I admit I do have a slow leak in the cooling system somewhere, but every

twoweeks or so I check and top off the radiator and reservoir."Dean Dardwin"

<d...@dxd.com> wrote in messagenews:3C4F3E53...@dxd.com...

Tiger,You have air in the cooling system. Fill the radiator.DeanTiger wrote:
I have a 1997 Chevy Silverado 5.7l and for as long as I can remember,
when I
take off in forward in the morning, I hear a sloshing sound of fluid
running
somewhere under the dash. Of course, nothing comes out wet, and no
levels
are low that I can tell, but what is that? It possibly sounds like

theliquid in the heater core. It happens whether the heater or the AC is

[Mr Backdraft]

----------------
Just fixed it on my 97, had a friend that works in a shop do it, took
about two hours ,for him, and cost would have been about $250 or so.
You don't need to let this go much longer, also check your radiator
cap, if you have a bunch of buildup under the cap, get gasket fixed,
and flush cooling system and buy new radiator cap.

=======================================
==Most People work just hard enough ==
==not to get fired and are paid just ==
==enough not to quit - G Carlin. ==
=======================================

[Dean Dardwin]

Tiger,

I've heard of people paying around $500 at a dealer. For a lousy $40
gasket. But don't let it go. If you have coolant in the engine, your
bearings don't have long to live.

Don't think there is a recall but there are some TSBs. You can check at
www.nhtsa.com.

Dean

[Justin Fisher]

I was one of those people who got stroked for $500 at the dealer. But I had
to get the truck fixed immeditely, so I paid the money instead of looking
around for a better deal. Mine was so bad, that when I would pull up into my
driveway you could see fluid dripping.

"Dean Dardwin" <d...@dxd.com> wrote in message

news:3C50CD24...@dxd.com...

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[Norman Goodenough]

Give you all a heads up, On my '97 5.7L I had a bolt back out that hold the
tension pully for the belt. The first time it did this was no big deal and
did it at start up. I had it takin in to a dealer and "repaired". That
happened at 36,000. Then about 6 month's later at about 54,000 the sob did
it again while I was going down the road. I lost my belt, fan, fan clutch,
shroud, and radeator all in the blink of an eye. My Dad had a simaler
problem on a 4.3 '96 s-10. Anyone else experence this?

[Knuckles]

Dean Dardwin <d...@dxd.com> wrote in message news:<3C501E55...@dxd.com>...

> Tiger,
>
> Bingo! And if you don't get that leak fixed don't be real surprised if
> you end up having to replace the engine. The coolant may be going in the
> crankcase; Vortecs have a intake manifold gasket problem. Or, if the
> leak is external, you'll end up with enough air in the cooling system to
> overheat the engine. At a minimum you'll have to R&R the heads.
>
> Dean
>

So Dean, if someone had this problem, wouldn't they notice in their motor oil?

-Knuckles

[The Maupins]

From all the postings ... it appears this is too common to not be aware of.... is
it a defect in gasket design/composition, or in the manifold... is there a bolt
loosening tendency that can be added to periodic safety / preventative checks???
Sure would like to avoid any event as described by so many....
96 - 7.4 Vortec in a C3500
Thanks

[toddgilly]

I had that problem too after replacing the heater core in my 95 Cheyenne
for the third time and finally figured it out. The heater core supply
and return tubes come out of the bottom so any bubbles in the system
remain at the top of the heater core. To solve this problem you have to
fill the heater core with water before installation and cap it until you
connect the hoses and fix any leaks in your system before doing so.
Once all of the air is removed, I don't hear the sloshing sound any more.

I have had to replace more heater cores than I am comfortable with and
they fail within a couple of months now. Fortunately they are replaced
under warranty but it is the hassle of changing out the core. I still
have not put all of the screws back. I am thinking about putting ball
valves on the heater hoses so when it starts leaking, I can shut it off
and take it back to the dealer.

Anyone else having continous chevrolet heater core problems? These are
OEM genuine GM heater cores and they always leak in between the fins
somewhere in the middle of the core.

[Philip Mc]

I had a small leak in my 88 Chevy heater core and I used stop leak to fix
it. Occasionally I hear a sloshing noise that I could not really figure out
what was, and it pretty well has to be what you guys are saying here...
strange, real strange :-)

"toddgilly" <todd...@cox.net> wrote in message
news:3C74776E...@cox.net...

[czec...@gmail.com]

A very old thread, but for those who might be researching this currently - same sound coming from under passenger side dash of my 98 C1500. I describe it as a whirring sound. Found solution on other forums: there is a washer on the inside of the heater hose closest to the engine where it connects to the lead coming thru the firewall. Disconnect the hose and fish out the washer. You might need to make a hook out of a cotter pin or some stiff wire to fish it out of there. It wears out over time and starts vibrating around inside the line as fluid moves thru- that is what causes the sound. You can discard the washer and don't have to replace it. All it does is slightly restrict the amount of fluid that moves thru. One post on the other forum said they had the dealer do this for them and they did not replace the washer saying it wasn't needed.