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Sound of fluid rushing forward on start up

Posted: October 14, 2017, 8:39 pm
by Chef_Zimm
After siting for a while I hear a rush of fluid (gas I am assuming) from behind me moving forward towards motor. Is this normal? It sounds to be on the pasanger side....
Thanks ahead of time guys!

Re: Sound of fluid rushing forward on start up

Posted: October 14, 2017, 8:48 pm
by slick4x4
You might have to give more details
Engine ? Trans ? Mostly stock ?
You can hear this while the engine is running ?
Never been able to hear fluid really....
The heater might have antifreeze running thru it
Hard to beleave it would make much sound.....
Usally only can hear exhaust leaks & vacume leaks

Re: Sound of fluid rushing forward on start up

Posted: October 14, 2017, 9:40 pm
by Chef_Zimm
292, 4speed, completely stock. It last for a quick second right after the engine starts. You can hear it loudly rushing forward.

Re: Sound of fluid rushing forward on start up

Posted: October 14, 2017, 10:01 pm
by FarmMotorSports
A little air trapped in the heater core... :2cents:

Re: Sound of fluid rushing forward on start up

Posted: October 14, 2017, 10:06 pm
by Chef_Zimm
And is that something to worry about? Air in the heater core. How would I remedy that? It’s a new sound...

Re: Sound of fluid rushing forward on start up

Posted: October 14, 2017, 10:14 pm
by slick4x4
I would think if your coolant level is
Topped off... shouldn't be a problem

Are you sure it isn't the starter disengaging ?

Can you start it , run 15 seconds , shut off...restart, does it
Sound the same way... or just after sitting a while ?

Re: Sound of fluid rushing forward on start up

Posted: October 14, 2017, 11:05 pm
by Chef_Zimm
Only after sitting a while. It clearly is fluid and air gurgling.

Re: Sound of fluid rushing forward on start up

Posted: October 15, 2017, 8:32 am
by tomrooster
Like Farm says (A little air trapped in the heater core...) check your coolant level . Tom

Re: Sound of fluid rushing forward on start up

Posted: October 15, 2017, 8:57 am
by 64 f100
Like my uncle always said if it makes a noise you don't want to hear turn the radio up. :lol:

Re: Sound of fluid rushing forward on start up

Posted: October 15, 2017, 6:08 pm
by FarmMotorSports
My experience is if it's full of coolant, and kept full, it will eventually work it's way out of the heater core.
The more you use it the sooner it will happen.
But it's just noise, and shouldn't cause any other problem.

Re: Sound of fluid rushing forward on start up

Posted: October 15, 2017, 6:48 pm
by unibody madness
On the other hand if it does it every time it sits for awhile, you may have a leak in the heater core, or heater hoses that is tiny enough to not be noticed.
I would take the cover off of the heater box and check for obvious signs of a leak that will cause rot.
Easiest way to check is to loop a hose at the water pump so you bypass the entire heater system.

Re: Sound of fluid rushing forward on start up

Posted: October 16, 2017, 6:16 am
by Toyz
As noted on the “other” site, this is quite often symptomatic of reversed heater hoses.