Nissan 370Z Forum - View Single Post - Need some advice on coolant bleed using the lisle spill free funnel

ZPWR · 11-03-2021, 04:35 AM

Yo fellow Z owners. I just did a recent coolant flush and bled it with fresh new coolant using a spill free funnel kit - brand called lisle. And boy does it take ages! Like I took nearly 2hrs with a friend just revving the car, letting it idle, burping the upper rad hose - rinse and repeat like 50+ times.

My issue is I'm not quite sure if I have bled all the air out 100%. First I'll go over the current symptoms:

- Car's heater would only kick in at MAX temp with/without AC. Anything lower it's cold air. Before I would get hot air even with AC on on high temps.
- Little but minor rough idle. Hard to notice unless you sit real still. It was def alot smoother before I did this coolant job.
- A slight hissing noise in the AC vents at high temps (28 deg C)

What I noticed during the bleeding using this funnel kit, alot of my air bubbles escaped during idling right after revving abit. And for some reason it only worked with the AC off but with MAX temp. During this time we squeezed the upper rad hose a few times to help with the process. Also the front end was raised by jack stands.

Also when I revved the car for 10-15 seconds the coolant level on the funnel would rise and drop back down when I let it idle. Is this normal?

I got to the point where very tiny little bubbles escaped out of the funnel to barely any at all. But I felt this wasn't good enough and I have suspicions that there's still abit of air trapped in the system. Do you have to keep going until literally ZERO air bubbles escape the funnel? I feel like that would take all day.

Also I read that there isn't a bleeder port for the 370z and only the 350z has one. Is there another way to get all the air out?

I'm also considering just vacuum filling the whole system just to be safe. Don't want no cracked heads or white smoke problems in my fairly new Z. Some scary threads in here that I've already read. Gonna give me nightmares

I'm on the process of buying the whole kit plus a compressor to make it all work.

Any thoughts and advice always appreciated. I always received great input from these forums. Thanks!

(sorry for the long post)

11-03-2021, 04:35 AM	#1 (permalink)
ZPWR Base Member Join Date: Sep 2020 Location: Australia Posts: 31 Drives: 2012 370z Sport Rep Power: 3385	Need some advice on coolant bleed using the lisle spill free funnel Yo fellow Z owners. I just did a recent coolant flush and bled it with fresh new coolant using a spill free funnel kit - brand called lisle. And boy does it take ages! Like I took nearly 2hrs with a friend just revving the car, letting it idle, burping the upper rad hose - rinse and repeat like 50+ times. My issue is I'm not quite sure if I have bled all the air out 100%. First I'll go over the current symptoms: - Car's heater would only kick in at MAX temp with/without AC. Anything lower it's cold air. Before I would get hot air even with AC on on high temps. - Little but minor rough idle. Hard to notice unless you sit real still. It was def alot smoother before I did this coolant job. - A slight hissing noise in the AC vents at high temps (28 deg C) What I noticed during the bleeding using this funnel kit, alot of my air bubbles escaped during idling right after revving abit. And for some reason it only worked with the AC off but with MAX temp. During this time we squeezed the upper rad hose a few times to help with the process. Also the front end was raised by jack stands. Also when I revved the car for 10-15 seconds the coolant level on the funnel would rise and drop back down when I let it idle. Is this normal? I got to the point where very tiny little bubbles escaped out of the funnel to barely any at all. But I felt this wasn't good enough and I have suspicions that there's still abit of air trapped in the system. Do you have to keep going until literally ZERO air bubbles escape the funnel? I feel like that would take all day. Also I read that there isn't a bleeder port for the 370z and only the 350z has one. Is there another way to get all the air out? I'm also considering just vacuum filling the whole system just to be safe. Don't want no cracked heads or white smoke problems in my fairly new Z. Some scary threads in here that I've already read. Gonna give me nightmares I'm on the process of buying the whole kit plus a compressor to make it all work. Any thoughts and advice always appreciated. I always received great input from these forums. Thanks! (sorry for the long post) Last edited by ZPWR; 11-03-2021 at 04:50 AM.