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Originally Posted by quickdiversion
I think there maybe something people are over looking.
Is your water pump old or new? I did not catch that it was replaced.
What can happen with an old water pump, especially in a high reving motor and under boost is that the fins are not spinning at the correct speed they were designed for. The cause the water inside the pump to cavitate, meaning that it will actually start bubbling and creating air pockets in the water. This will keep the water from covering all the surfaces it is supposed to and can make cooling less effective.
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Age of a waterpump isn't a 100% definitive reason for poor working ability. Sure the bearings can go bad, but it's not like it's 'not going to work' as well as a new one, this side of the impellars rotting or rusting way, which is highly unlikely.
Quote:
Originally Posted by fliprayzin240sx
I vote bad HG...atleast one thats slowly going bad. Its probably leaking under load.
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HG, a bad radiator cap, or a fan that isn't working properly.
Quote:
Originally Posted by silviaNC
Thanks for the help guys, I fixed the water leak issue and set up fans to 180 on/170off and car stays between 185/195 so I think I got it straight. Still need to take some time and go thru the gauges wiring and alternator check when I get a day off. Water pump.is fairly new.
I checked evrything relater to hg and block and everything is good. I just hit 1k miles on build
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I think it's less a mechanical issue, and more electronically related like you've posted. Get the gauges on their own system, and use proper relays/fuse/gauge of wire to keep them seperate.
Having the E fans come on at 180 is a much better idea too, have them shut off at the same time.
Also, where is your sender for coolant temp located?