G37 Overheating issue

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May 11, 2018 | 04:25 PM

Sparrow Greg

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G37 Overheating issue

Hey guys/galls I am fairly new to the G life, I recently purchased a 2011 G37 sedan auto base model and I am having a issue, the car overheats on stops only and once I turn the heat on it drops to normal almost instantly, if I leave the Ac on it climbs to H in no time, I recently replaced the T stat thinking that was the problem and it wasn’t , also the fans are working perfectly, anyone have any idea or have this happen ? Any help is appreciated , thanks !! Vehicle has 63k miles .

May 11, 2018 | 04:36 PM

slartibartfast

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Is coolant at proper level in the radiator and overflow container? How old is the coolant?

May 11, 2018 | 04:57 PM

Bommerang

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Seems like you've checked everything except what slartibartfast said which would be the coolant level itself? More than likely it may be low or just really old coolant.

May 11, 2018 | 05:55 PM

Sparrow Greg

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I have never changed the coolant , the levels are fine tho . Car has 63k miles but iv never changed it, should I do a coolant flush ?

May 11, 2018 | 06:01 PM

GdaddyNY

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Are the cooling fans working? Fan modules are common failures

May 11, 2018 | 06:41 PM

ILM-NC G37S

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Double check the fans to ensure they are turning at full speed. I had the same problem: temp would rise when stopped at a red light/ drive-thru, etc. and drop to normal once I started moving again. Also, my A/C did not blow as cold. I tested the fans and it turned out they were both giving up the ghost.

May 11, 2018 | 09:03 PM

Sparrow Greg

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Both fans are working well, I think I’ll do a coolant flush and see what happens , I can’t think about anything else that can cause this issue, it’s extremely wierd

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May 11, 2018 | 09:47 PM

slartibartfast

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Please report back if the flush fixes the issue.

May 13, 2018 | 07:57 AM

Sparrow Greg

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I want to do a test before the flush , is there a way to make my cooling fan work always when the vehicle is turned on? Maybe by bridging the temp sensor ?

May 13, 2018 | 08:53 AM

#10

GdaddyNY

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Quote:

Originally Posted by Sparrow Greg

I want to do a test before the flush , is there a way to make my cooling fan work always when the vehicle is turned on? Maybe by bridging the temp sensor ?

If you have a good scan tool (not just a code reader), you can usually activate the fans. I thought you said the fans are working fine?

May 13, 2018 | 12:27 PM

#11

ILM-NC G37S

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The car already has a self test protocol built in. This link is for the Nissan Note but the procedure is the same:

http://www.noteownersclub.co.uk/foru...topic2638.html

In my case I ran the IPDM self test and one fan only spun at half speed and the other never came on. To make sure it was the fan motors and not the module, I disconnected the fans from the module and ran 12V directly to the fans- they were goners.

In the end I bought a used, complete fan assembly from a 2016 370Z off eBay and 20min. later problem solved.

Last edited by ILM-NC G37S; May 14, 2018 at 09:27 AM. Reason: Fixed link

May 13, 2018 | 05:19 PM

#12

GdaddyNY

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Great diagnosis! Glad you got it figured out.

May 14, 2018 | 08:41 AM

#13

Sparrow Greg

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@ Gdaddy, it’s so wierd , I park it at home and the fan works once it’s warm, I go out into traffic and it starts to heat up and I park and check and the fan isn’t working , then turns on maybe 1-2 mins later , I’m guessing there’s something wrong with the module ?

May 14, 2018 | 08:52 AM

#14

Sparrow Greg

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Quote:

Originally Posted by ILM-NC G37S

The car already has a self test protocol built in. This link is for the Nissan Note but the procedure is the same:

http://http://www.noteownersclub.co....topic2638.html

In my case I ran the IPDM self test and one fan only spun at half speed and the other never came on. To make sure it was the fan motors and not the module, I disconnected the fans from the module and ran 12V directly to the fans- they were goners.

In the end I bought a used, complete fan assembly from a 2016 370Z off eBay and 20min. later problem solved.

The link doesn’t work but I’ll try to research and see if I find how to do the test as I strongly believe it is the fans malfunctions when it wants , this morning in my drive way once it warmed up the fan kicked in, however on my way to work the temp started to rise at a stop and I got out and the fan was not working , I parked at a gas station and it was working a couple mins after, this is wierd iv never seen a car do this, should I replace the module ?