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Old 02-21-2021, 01:01 AM   #11
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The VG30E has a burp valves for the coolant on the intake manifold.

Back off the bolt, let the air escape, and the coolant will flow.
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Old 02-21-2021, 05:31 AM   #12
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Nissan said the fan clutch should be changed every time the timing belt is replaced.
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Old 02-21-2021, 07:47 PM   #13
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I checked the fan clutch and it's good. Lots of resistance when it's turning.

Discovered a leak. This one is my fault because it's coming from the thermostat housing. This was my first thermostat job and getting the new one in required a lot of trial and error because of the tight spot that it's located in.

I used grey rubber sealant and the gasket that was sold to me with the thermostat. I've never used sealant before and I suspect that it smeared during reinstallation, is therefore uneven and creating a leak. I did clean off the old sealant and crumbly gasket before putting the new stuff in.

Is it necessary to use sealant AND a gasket? Could I use only a gasket and have a tight seal?
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Old 02-21-2021, 07:58 PM   #14
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Some people like to use RTV and a gasket. I prefer to use only a gasket where there is one.
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Old 02-21-2021, 08:29 PM   #15
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And I've only used RTV
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Old 02-22-2021, 01:51 AM   #16
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I had the same issue with a 97 with a four cylinder, one of the hoses remained cool while the other got super hot. I sold it before I figured out the problem. I told the new owner about it and he didn’t care. Not a big deal here in Phoenix. Without the thermostat installed, it never warmed up. Now, anytime I replace a thermostat, I check to see if it opens before I install it. Put the thermostat in a pot with some water and heat it up. You’ll be able to confirm if it works or not. I didn’t think the thermostat could get put in backwards in the six cylinder. I agree with making sure you have enough coolant and you’ve bled off all the air. Also make sure the little relief button/tab/hole on the thermostat is in the correct position, should be at the top I believe.

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Old 02-22-2021, 06:01 PM   #17
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How old is the water pump? It's a possibility that the vanes on the impeller could be worn and not sufficiently moving the coolant through the system
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Old 02-24-2021, 05:42 PM   #18
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As far as I know, it's as old as the truck. I found out the timing belt had been replaced 6 years ago, but don't know if anything else in that area was.

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Originally Posted by Ftown View Post
How old is the water pump? It's a possibility that the vanes on the impeller could be worn and not sufficiently moving the coolant through the system
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Old 02-24-2021, 05:44 PM   #19
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Thanks for all of the feedback so far.

Just for kicks, I tested both the old and new thermostats in a pot of hot water. The old one opened at around 180 degrees, the newer one around 190. They're rated for 170. Is their performance considered acceptable, or will the delayed opening cause overheating?
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Old 02-24-2021, 05:47 PM   #20
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I've fought with a LOT of overheating issues on my VG30i. If you have even the tiniest of leaks it will get air in the system and the truck will overheat. I've replaced every coolant hose on my truck (some two or 3 times) as well as all the gaskets in the inlet/thermostat/etc. area multiple times. The vast majority of times I've dealt with overheating, finding the leak meant cleaning each coolant hose/pipe, filling the system, running the truck until it overheated, then letting it cool off so you don't burn yourself and checking all those pipes. If you find one that's got some discoloration around it, even the tiniest little bit, that's probably where air is getting in and your coolant (probably in the form of steam) is escaping.
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