briq4

I have an 05 EX, and from time to time I can hear gurgling coming from the heater core. Usually when I'm starting up from a dead stop. Just wondering is there a bleed bolt somewhere that might alleviate the air that is somehow in there? And more importantly do you think it will hurt anything? I would think the coolant in the engine would have a way of working any air bubbles out of it but how would it get out of the heater core?

Any ideas would be greatly appreciate.

Miracle

Undo the radiator cap, turn on the heater in the cabin, and let the water pump purge the air out of the system VIA the open cap. Then, just fill the system as nessecary.

briq4

Do you think I'd need to let it idle with the cap off for over 20 minutes? That's how long I did it, and if I revved the engine it would just spill out the radiator cap, The fans came on several times, and the heat was on as well. Anything I'm missing here?

Boilermaker1

sure you dont have a pinhole in a hose? I'm not sure how you'd hear air bubbles inside the system, but youd certainly hear something leaking out.

briq4

Perhaps I used the wrong word to describe the sound, it's more a gurgling sound. NO coolant is being lost, it's just you can hear a slight sound as though you had a water bottle and you poured it out.

Newborn_

I've never looked, but i'd like to bet there's a bleed screw on one of the hoses somewhere.

Curiouz_G

you know, ive had that sound in my car since 15,000 miles and im going onto 23,500. i cant figure it out for the life of me. ive searched everywhere on 7thgencivic.com and couldnt find anything that helped.

postman

gurgling noise in overflow tank probably. check your radiator cap and bleed screw should be near the upper coolant line going into the engine

LowTec MOHawk

hey guys, i remember a while back coming across a ServicNews publication a while back about this. and i searched the service manual to see if theres a bleed screw and there isnt one on the d17 engine. n e way heres a copy of honda's servicenews pub. for the gugling sound:

Gurgling From Heater Core
Accelerating Thru 1,400 rpm
Trapped air in the heater core of a ’01–05 Civic can
cause an occasional gurgling that’s loudest when
lightly accelerating through 1,400 rpm with the
temperature control dial cranked all the way to
maximum heat.
Bleeding the cooling system might cut down on
the noise but, in some vehicles, the heater core
may still gurgle even after extensive bleeding.
Here’s a way to bleed the system and get good
results:
1. Make sure the temperature control dial is set to
maximum heat (it’s turned fully clockwise).
2. Remove the radiator cap, and attach a Matco
Tools Spill-Free Funnel (P/N SFF2) to the
radiator filler neck. If your shop doesn’t have
one of these nifty tools, you can insert a clean
outer CV joint boot into the filler neck opening
instead.
3. Start the engine, and let it idle until it reaches
normal operating temperature.
4. Fill the funnel with engine coolant. The funnel
raises the engine coolant level, increasing the
pressure on the air bubble.
5. Lift up the right front corner of the vehicle.
Increase the engine speed, and “burp” the
heater core by massaging the hoses.
6. Turn off the engine.
7. Remove the funnel, and reinstall the radiator

briq4

are they talking about massaging/Burping the radiator hoses or the small hoses that run to the heater core itself? And it sounds kinda kinky, but hey if it works I'll try it.

LowTec MOHawk

haha i dunno.......id just try both upper lower radiator hoses and the heater hoses.