Wednesday, Feb 15, 2006 at 18:34
My Turboed GQ runs cool all the time.
A few pointers which may help....
1.Obviously the Viscous fan is critical. If it is not working 100% when you need it you'll overheat.
2.Use the lowest % glycol Vs water mix you can get away with considering your winter temperatures. Water is a better coolant than glycol because it needs more kilojoules (or BTU's or what ever you prefer) to raise a litre of water by 1 degree than the glycol. I run only about 10% glycol. If you can get away with no glycol then do so - but of course you need a suitable corrosion preventative. I use Redline's "Water wetter" additive which I believe helped considerably. See their website.http://www.redlineoil.com/products_coolant.asp?productID=53<a
3. Radiator must obviously be clean internally as well as externally.
4. I tapped in to the heater line using a commodore heater valve, and added an extra mini radiator (using a heater core from the wreckers) fitted in my 'roo-bar, so that I always have water flowing thru the heater line instead of it being shut off when you are not using the heater.
5. I have an oil cooler fitted- figured it takes load of the internal heat exchange cooler near the oil filters.
6.Finally, I fitted a High flow thermostat, though I don't know how that compares with the genuine Nissan variety as mine went in the bin years ago.
Net result is an engine which NEVER runs hot even though I tow a heavy van and boat and run 12psi boost on my turbo.