Just bought my truck this week. '01 Sport, 5.9 with auto trans. After I start it, and for about 20 seconds or so, I hear what sounds like fluids running through lines under the truck. It's hard to describe but it's almost like a river sound....like water running over rocks. After about 20 seconds it stops. Sound seems to be coming from right around the rear of the engine/front of transmission area.

Any ideas?

Thanks in advance.

 

sounds like the heater core maybe...is there any leaks? does the sound come from the dash area?

 

Could be, hard to pin it down. I'm going to have the wife start it tomorrow while I get down near the floor/bottom of dash area and see if I can track it down.

 

yea, if it is a fluid sound, see if there are any leaks anywhere,, if not, its inturnal, and there will be more work to be done

 

I see no external leaks of any type.

 

open the glove box and stick your ear up to it. i bet its the heater core gurgling due to air in the lines. meaning either a blown heater core, bad radiator cap or a leak somewhere.

 

I'll do it tomorrow, thanks.