bottom end sound
 

Hiya all, first post in here and found a font of knowledge already with other issues that my truck is having... First lemme shine some light on the specs of my recently aquired truck :)

it is a 1996 Chevy Blazer LT, 160k miles, 4.3L vortec V6, 4wd, 4 door

I replaced radiator,tranny cooler and termostat( some schmuckmixed Gm dexcool with prestone <_<), and placed a new CAT on and the O2 Sensor( And that was a fight and a half)

Now here is the problem I am having

Just noticed a sound recently coming from underneath the floor boards the almost sounded like I had water sloshing around where the tranny hump and firewall meet... I parked the truck and hopped underneath while giving the truck some gass from the accelerator and i find out the sound is coming from the bottom end of the engine. I havn't been able to get under it with the help of a jacks stands or ramps, but it is more a clunking sound, but a smooth clunk... its really hard to describe :P

EDIT: Also when I accelerate from take off, at lower rpms i can here it, but it doesn't when at a steady pace

If anyone can help me I so would greatly appreciate it :)

thank you

RE: bottom end sound
 

You sure it's not coming from the passenger's side floorboard? Sounds an aweful lot like you have air in your heater core.

RE: bottom end sound
 

hmm I will have to check that... Which mean the stupid question...

"How do you check to see if you have air in the heater core?" [:-]

RE: bottom end sound
 

sounds sorta like a heater core, but that would be much higher. I would check your tranny and oil fluid levels first off.

RE: bottom end sound
 

I checked the fluid levels for the tranny and the oil just earlier today, it isat the full linesand the tranny fluid is still pink and translucent and the oil is still a nice amber color... So if that helps :)

RE: bottom end sound
 

sorry for double post but update as i forgot to mention this:

When i am driving i hear the sound as well at lower RPM's when taking off, but not at a steady speed and rev

RE: bottom end sound
 

if you pull in and out of your driveway back and forth, you should hear it sloshing near the radio area, try to see if it is coming from that area. if it is, you can take off your radiator cap with the car running and let any air bubbles come to the surface, this may help you

RE: bottom end sound
 

I just took the truck out to drop off a friend and had him listen in as well and it was on the passenger side close to the firewall below the dash where the radio is, so i will try to take the cap off and see if that works

tyvm all for the help so far :)

RE: bottom end sound
 

I had that problem on my 91. Exept the heater core actually had a leak in it. I didnt realize what was wrong untill i had antifreeze spilling out form the bottom of the dash on the passenger side. lol.