tite_tite

Yes, I was afraid of that & not sure if some pre-req stuff needs done before replacing leak hose. I ran into this DIY therefore I asked. Interesting DIY I may say

Nissan 370Z: Eliminating hot coolant heater hoses on both throttle bodies - Nissan 370Z Forum

antirice

iTrader: (2)

I wouldn't bother bleeding the system. I have disconnected water hoses from multiple locations, without bleeding the system afterward. Never had an issue, YMMV.

Also I don't know what year is your car, but most likely the hose is not the problem. It's the clamp that's losing tension. So all you really need is to put new clamps on.

tite_tite

2010 G37 sedan. Coolant drain & fill done bout 11k ago in 9/2015.

I'm thinking if coolant comes out then bleeding is needed but if not then no bleed.

I'm gonna just change the whole hose. Website has it for bout $8 so hopefully dealership is bout same.

Keep the input coming. Appreciate all

tite_tite

Upon further inspection.. It looks like it's leaking from back of engine too . Looks like it is the hose going to the left throttle (passenger). This one might b a little tougher to get to.

tite_tite

I was able to changed the leaked hose by driver side throttle. Please see below post for advice on sand paper I need.

Now to back of engine. Is the hose leaking or are those residue from the throttle body leak hose. I zoomed in & doesn't looked to be leaking. Prob need to wiped clean & monitor. Pic 5, is that the plastic coupler?

tite_tite

which sand paper is recomended for cleaning the pipe.. there is some rust/corrosion from the leak coolant. i tried a razor blade but it is not cleaned all the way & afraid it may leak and/or seep. thanks in advance.

crookncastle

pic5 is not a coupler. that is just a holder that keeps the hose in its place. as far as sandpaper i would suggest using steel wool and spraying it with some good lubricant and use that to clean off the rust. then put a little dielectric grease inside the hose so when you slip it on to the throttle body coolant pipe it will not only help the hose slip on easier but prevent corrosion from building up again.

tite_tite

Dang it.. It's leaking from back not as bad as the leaked hose replaced. Maybe the clamp cuz it's is only leaking from back but not front. Will most likely change hose & clamp. Hope all goes well.

NOTE: not much coolant came out when leaked hose was replaced so didn't bleed. Will see how I feel after hose replace (back) before bleeding.. Lol

RJ's_G37

Was searching through threads so hopefully you guys can help me out..about a month back i noticed a leak,it was the tope hose and the oem clamp was fried so i replaced it and filled my coolant tank..last week i noticed the smell coming back and was able to take pictures..if you guys can help me out id appreciate it

tite_tite

take the engine cover off & take pics w/ lights or outside during the day.. that way we can see better..

bransja

HA! I just bought my 2012 with 46k and that is the exact location mine is coming from!! dealer tried to tell me we needed to pull motor and replace rear intake and gaskets...

tite_tite

changed the hose but my forearm(s) all scratched up.. boy it is pretty tight back there.

i highly recommend you use/get this tool for removing/installing clamp for hose. that little guy will do good!!

tite_tite

Additional pics. Hope this will help the next person. Will update further if leak continue to leak... finger crossed & hope not

pic 1 - hose & part number(s)
pic 2 - the little sucka in the back
pic 3 - ideal position for flashlight. light can be had for FREE at harbor freight. rubber band is VERY important cuz it fell a couple of times + it was stuck on the frame/wire/something..

tite_tite

Help Needed. Can you tell me if this is push in all the way or i need to push the hose further in? it's the hose from the back to the throttle (passenger side). Thanks in advance.

crookncastle

looks like its seated properly.