hey guys i got a 94 cummins and when im sittin in the cab with the truck idling its sounds like to me u can hear like coolant runnin to the heater box and i have never heard this noise b4 and i was wonderin what i should do bout it.....im gittin ready to change my thermo tomm cause its not gittin up to temp. but i didnt kno if that had something to do with it or not but i thought it was jus weird any answers would b appreciated thanks

 

If you can smeel or "taste" something sweet while sitting in the cab, your heater core may be leaking.....

 

no i cant smell anything i can jus hear it

 

is the blower fan on for the heater-a/c system???

you may have a loose fan or debris in the fan when on low speeds makin funny noises.


I would back flush the cooling system.

1-use the radiator flush solution to clear out the junk

2-cut a T in and back flush with a hose.

3-fill back up with 50/50 mix

wont cost too much scratch and will be a PM at the same time

 

My 97 makes that noise every morning when I start it, has since new, But mine only does it in the morning when started, only lasts a few seconds though! Sounds like water running through a plastic pipe.