G35 Coupe V35 2003 - 07 Discussion about the 1st Generation V35 G35 Coupe

everything new still overheating

  #1  
Old 03-21-2019, 02:23 PM
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everything new still overheating

I changed the rad, thermostate, water pump, rebuild motor... Car is still over heating...no air lock..
Please can someone help. Thanks 2005 g35 revup
 
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Old 03-21-2019, 02:41 PM
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Did you replace coolant temp sensor... do you have heat at idle? Most likely there's still air in the system the VQ35 is really hard to bleed. Use vac bleeder or no spill radiator funnel
 
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Old 03-21-2019, 02:47 PM
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Thanks I didn't replace the coolebnt sensor...
I do not have heat at idle.
I did use a no spill rad funnel.
 

Last edited by edwin05; 03-21-2019 at 02:53 PM.
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Old 03-21-2019, 03:23 PM
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Pressure test the system and the cap.
 
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Old 03-21-2019, 07:03 PM
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Originally Posted by [email protected] View Post
Pressure test the system and the cap.
Best idea! ^ Just because you replaced almost everything in the cooling system doesn't guarantee they're all working as intended! I always test a thermostat before installing it! Pressure test, will pinpoint where the system is failing so you're not throwing more unnecessary parts at your G!
Gary
 
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Old 03-31-2019, 08:27 PM
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Watch motordynes video on how to do a coolant flush. It shows the most efficient way to bleed the system of air
 
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Old 04-01-2019, 11:51 AM
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Thanks Where do i find that video
 
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Old 04-01-2019, 12:10 PM
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It's not a video by Motordyne the company, it's a YouTube user who goes by the name "Motordyne G35".

I haven't watched the video so no comment about it but it's not as hard as people make it out to be if you just follow the directions. I can only guess that most folks are in a hurry and just fill the thing up which will never work on this car.
 
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Old 04-01-2019, 12:14 PM
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awesome thansk!!
 
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Old 04-01-2019, 05:56 PM
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The shop did a cylinder leak test.
1st cyl 3psi
2nd cyl 25psi
3rd cyl 15psi
4 cyl 25psi
5 cyl 5psi
6 cyl 20psi

Do I have to change my head gasket
 

Last edited by edwin05; 04-01-2019 at 06:00 PM.
  #11  
Old 04-01-2019, 08:00 PM
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Those are not real leakdown test numbers, it will be displayed as a PERCENTAGE, not psi.

Basically the manifold you use has two gauges, one shows how many psi is being applied to the cylinder (about 80psi usually) and the other shows what percentage of the air is being lost. iirc mine was like 15% average across all cylinders, they were pretty much all the same from one cylinder to the next. I have a rev-up with 130k on the factory rings so I wasn't surprised about the 15% number, usually you want it under 10% on a new motor.
 
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Old 04-01-2019, 08:10 PM
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so does this mean I do need to change my head gasket?
 
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Old 04-01-2019, 08:18 PM
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No it means you need to post the actual results of the leakdown test. If you are unsure how to interpret it then take a photo and upload it.
 
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Old 04-02-2019, 07:00 AM
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G35 sedan w/ too much money in mods
Originally Posted by edwin05 View Post
The shop did a cylinder leak test.
1st cyl 3psi
2nd cyl 25psi
3rd cyl 15psi
4 cyl 25psi
5 cyl 5psi
6 cyl 20psi

Do I have to change my head gasket
Why didn't you ask the shop the same question? And if you did what did they say?
 
  #15  
Old 04-07-2019, 12:31 AM
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Maybe an obvious question but are both fans running? One of the relays could be out and you could have just one side working and not be aware of it. That would cause overheating if you run the AC with one fan running in stop and go traffic.
 

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