Overheating

ULISES23

MEMBER
2008 INFINITI G37
3.7L
V6
2WD
AUTOMATIC
178,000 MILES

My car overheats after 5 minute of operating. If you open the radiator cap it has no water but the reservoir is full. When the car overheats you can see smoke and water marks behind the engine cap towards the passenger side. The leak does not seem to be coming from the radiator because the spill is not coming from the front. As soon as you add coolant, you'll see it on the ground automatically. The coolant seems to spill from under the throttle body, everything is so compacted together that is hard to see where the issue is.

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

I would start by doing a pressure test to locate the leak. Once you locate it, take a picture and post it here for me to see.

https://www.2carpros.com/articles/radiator-pressure-test

https://www.2carpros.com/articles/car-is-leaking-coolant

I would also replace the cap. It sounds like it has a bad valve in the cap.

The thermostat is another thing you should change as well as it may be stuck closed causing the coolant to get too hot.

https://www.2carpros.com/articles/how-an-engine-thermostat-works

Roy

Removal and Installation

REMOVAL
1. Remove engine cover.
2. Remove air duct and air cleaner case assembly (LH).
3. Remove reservoir tank.
4. Remove oil cooler water pipe mounting bolt, and move aside water pipe.
5. Remove engine undercover with power tool.
6. Drain engine coolant from radiator drain plug at the bottom of radiator.

CAUTION:
Perform this step when the engine is cold.
Never spill engine coolant on drive belts.

7. Disconnect radiator hose (lower).
8. Disconnect intake valve timing control valve harness connector (LH), and remove intake valve timing control solenoid.

imageOpen In New TabZoom/Print

9. Remove water inlet and thermostat assembly (1).

CAUTION:
Never disassemble water inlet and thermostat assembly.
Replace them as a unit, if necessary.

A: Do not loosen these screw.

Images (Click to make bigger)