cooling problems vs 5.0lt

[timgray]

hi guys i was wondering if someone can give me some advice on getting my car to run cooler. out on the highway its fine but around town it reaches up to the second line past the half way mark.is this normal. im not running thermals just the stock viscus fan running off the water pump. have already changed thermostat given radiatir a flush and filled with fresh water and coolant.when im driving it around town and it heats and i shut it down it sometimes pumps water out of the overflow and i already changed the cap also. any help would be aprecited thanks

[VrWagz1]

It sounds like you have a very small minor leak somwhere for the over flo bottle to fill up and pump water out. Basically if it depressurises over say 10 min with a minute leak it wont re-suck the expelled water back in from the overflo bottle and it simply fills it up and spews it out. Look at your hose clamps, thermostat housing(especially if theres evidence of pooling in the inlet manifold next to it), and welsh plugs, and heater tap too, water pump front seal too. Also check your thermo fan is hardish to turn, if its sort of freewheeling a bit then it wont be effective in drawing air through the radiator in traffic jams. That will give you a start anyway.

[BlackVXGTS]

The water is pumping out of the overflow bottle because the coolant is overheating. When you turn the engine off, the pressure in the cooling system decreases and the coolant expands. Normally this is not a problem but if your coolant is overheating and you turn the engine off, the loss in pressure causes the coolant to boil and pump out of the overflow bottle. The thermostatic clutch in your fan may need replacing.

THERMOSTATIC CLUTCH TEST

1. Drive vehicle to achieve normal operating temperature.
2. Stop vehicle and run engine at approximately 2000 rpm.
3. Listen for fan engaging (indicated by fan noise or 'roar') when engine is hot. When temperature has been reduced sufficiently, fan clutch should disengage - indicated by a drop in fan noise.
4. If fan is continuously engaged or disengaged, replace thermostatic clutch.

If it's faulty, save yourself some money and just get a new clutch (the centre bit) and relocate the fan blades from the old fan onto the new clutch. You don't need to replace the fan blades themselves.

[deanos70]

see if there is any oily substance on the fan, if so the silicon fluid in the clutch fan has leaked out,
definately sounds like a clutch fan or radiator problem , your clutch fan should disengage at higher speeds and just let the force of air flow cool your radiator, and run at lower speed when not much air is getting pushed into the radiator

have a good look at your radiator see if the fins are real brittle as well