03 M45 Coolant leak under intake manifold

Forum for Infiniti M35 and M45, and Nissan Fuga owners.
ngtr800
Posts: 10
Joined: Mon Nov 08, 2010 9:58 pm
Car: 2003 M45

03 M45 Coolant leak under intake manifold

Postby ngtr800 » Fri Feb 03, 2012 11:35 am

I noticed that the coolant level was low and that the coolant was accumulating underneath the intake manifold just behind the thermostat housing. I used a pump to remove the coolant underneath intake manifold about 24fl oz. I could see the coolant rise just behind thermostat housing when i added more coolant.

Has anyone had a similar experience? and what are some of the suggestions of what it could be? thanks

Car has 94,000 miles and coolant flushed every 20,000 miles.


seldomseen
Posts: 1308
Joined: Thu Jan 24, 2008 7:40 am
Car: '12 Altima Coupe 3.5 SR & '15 Lexus GS350 F Sport

Re: 03 M45 Coolant leak under intake manifold

Postby seldomseen » Tue Feb 07, 2012 5:45 pm

Just take your car to the dealership and they will be able to fix the problem. :ohno:

ngtr800
Posts: 10
Joined: Mon Nov 08, 2010 9:58 pm
Car: 2003 M45

Re: 03 M45 Coolant leak under intake manifold

Postby ngtr800 » Sun Feb 12, 2012 9:41 pm

I finally had some free time today to fix the leak under the intake manifold. It turned out to be an o ring that had deteriorated. The o ring from the heater pipe that connects to the cylinder block just behind that water pump. I had to take off the intake manifold, fuel injectors, and a bunch of hoses. It wasn't a hard project i just followed the instructions on the manual that i download from this website.

Don't forget to check underneath the intake manifold for leaks of your m's.

ngtr800
Posts: 10
Joined: Mon Nov 08, 2010 9:58 pm
Car: 2003 M45

Re: 03 M45 Coolant leak under intake manifold

Postby ngtr800 » Sun Feb 12, 2012 9:54 pm

Here is a picture of the intake manifold removed

Image

Here is another picture of the heater pipe where the o ring went bad

Image

LIBRILZ
Posts: 1458
Joined: Sun Mar 04, 2007 3:17 pm
Car: 1990 Nissan 300zx
2007 M45 Sport

Re: 03 M45 Coolant leak under intake manifold

Postby LIBRILZ » Sat Mar 28, 2020 9:49 am

surprised more folks haven't had this problem..Or maybe they have?

Going to tackle this myself soon.


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