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Hey guys, About 6 months ago my water pump gasket started leaking. I ordered a brand new Nissan GTST pump, belt and gasket. Gave it to my mechanic as I was not brave enough to take the timing belt off and lack of time etc.... Anyway, he put it all back on but there have been a few things I have noticed and I am not sure if it is a result of things he's done or I just havent noticed it before: 1. As soon as I got the car back I noticed a slightly different note from the motor running, sounded a little more noisy. - He said thats due to the new water pump belt and it's a little tight so it might make that sound for a while, fair enough, admittedly it has reduced in noise, but not completely, not like it used to, I'm probably just pedantic about my car - nothing to worry about? 2. The car definitely does not run as cool, on the powerfc on cruising on the freeway even in melb's current cool weather, I am sitting on about 81-82, if I boost through a gear and then just roll after that temp instantly goes to about 85-86, when it was hot earlier this year just cruising on the freeway on a 35 degree day it got to about 95-96, never seen it that hot before. to consider though, with the responsiveness of the current turbo, when cruising in 5th on the freeway I am always on boost, and turbo is water cooled so I know that is contributing, but I remember when I had another turbo that was just oil cooled temps would never ever move past 78deg(I get that the turbo itself was hotter, but what about the motor?). I still have the factory clutch fan and shroud, I have never had the current radiator flushed, maybe an idea? 3. I think alot of these issues may still be caused by air bubbles, I have tried to remove the bleed screw mutliple times etc and have had a few odd bubbles come out. I have never noticed it before, but when I drive to work (32kms), then turn car off and sit there for a minute, you can start to hear bubbles of something bubbling away. It sounds like coming from around the back of the block - maybe through my turbo's braided water line - very hard to pin point, but there is definitely bubbles somewhere in there and they sound watery, ie they arent a glug, glug sound but more of a blip blip blip sound. I tried to record it but it's fairly faint and can't get it on an iphone. happens after a decent drive. Do I need to rebleed the system? Everything else seems fine about the car, oil is nice and dark, no milky bits, boosts well (not when completely heat soaked) and is running normally - the reason I am so concerned about cooling is because it's a GTS+T,so higher compression and it can suffer pretty badly from heatsoak so I would like to keep temps as cool as possible - 78 to max 80 all the time. thoughts? suggestions?
