04 G35, Heat Problem - Page 3 - G35Driver - Infiniti G35 & G37 Forum Discussion

Dec 1, 2011 | 01:06 PM

#31

g35 cornhusker

Registered User

Joined: Oct 2011

Posts: 5

Likes: 0

From: Omaha Nebraska

Turns out mine was blown head gasket the guy who did all the mods on my car f**ked it up like I said my car only has 20k on it! fml!

May 21, 2012 | 08:39 PM

#32

richard0ne

Registered User

Joined: Sep 2011

Posts: 25

Likes: 2

From: Redondo Beach CA

Damn that totally sucks bro. Sorry to hear that for reals. How is the car now? How much is it to replace a head gasket?

Nov 26, 2012 | 04:31 PM

#33

speedk1ng

Registered User

iTrader: (2)

Joined: Oct 2012

Posts: 143

Likes: 7

From: Northern Colorado

Quote:

Originally Posted by Z1Motorsports

It was definitely air in the system, most non VQ oriented mechanics do not know how to properly bleed our coolant system.

Elevate the front of the car (where radiator cap is highest point in the system), Top off radiator and coolant reservoir

Start the car

Turn the Heat on 90* and fans on high

Let it idle until operating temp is reached

Rev the car to ~3k rpm and hold for 10 secs

Let the car idle for a couple seconds

Repeat steps 5 and 6 4-5 times

Turn off the car

Place a fan in front of the car and allow it to cool completely down to ambient temp

Check reservoir and Radiator level, add if necessary

Repeat Steps 2-9 until you no longer have to add Coolant and your heat is Hot

*Warning: If temp gauge begins to quickly climb immediately shut the car off, let it cool to ambient temp and check fluids.
**Perform at your own risk, It is highly recommended for a professional familiar with the platform to perform this task.

-Rob

Rob,

Our '04 FI G35 is a recent purchase but had a Mishimoto dual core radiator installed at some point so the cooling system has been opened. The heater has never worked for us. Recently I had the car up on jacks installing a BBK and when I drove it immediately after, the engine temp gauge was all over the place (mostly hot). All I could figure (since I didn't open the cooling system) was that an air pocket moved from the heater core to the head.

After reading your instructions above, I went through the process and found a huge air bubble in the cooling system. When I opened the bleed valve (with the radiator full), there was nothing but air in that hose going to the heater core. I ran through your process and after repeating steps 5-6 a few times, the G finally has heat...but only when the engine is above 2k rpm. If you sit at a light idling for 30 seconds....the air gets cold again. I apparently have more air to chase.

I just ordered a Lisle Spill Free funnel which will be here tomorrow. With that, I should be able to get the rest of the air out of the system. What a pain.