Originally Posted by Highpockets
thanks has factory ac but not hooked up,and yes the fan is on the front outside of the vehicle so your telling me that it would only be needed for the ac system and was put there for that purpose...
if thats the case then what to do about engine getting to hot i have a new brand new engine and weber carb that runs great but after driveing it for a while it just gets to hot and the overflow radiator bottle spews out fluid....clutch fan seems fine and it pures like a sowing machine so what would you guys suggest me doing to remedie this????
You have a problem that needs to be identified & fixed.
Stock radiator should be ample cooling for a stock engine provided it's clean & not clogged - and this has nothing to do with rust - when last was that one cleaned? What condition are the hoses in? Waterpump? Radiator cap? How do you know the clutch fan is fine?
Where did you get a brand new engine from? Do you mean a remanufactured engine? Is it the same size as the original? Who did the work? Who jetted the weber? Is the timing correctly set? What thermostat is in it? Was the head retorqued after the first thousand or so miles - if not the head gasket could be gone.
There are many, many possible causes for overheating and you'll need to check them all.
Try to identify when (what conditions) the overheat occurs - when stationary & idling, in heavy traffic, uphill towing, highway speeds, etc. - as this information can usually be used to pin point problem areas.
As an example - a stock radiator in good condition can handle the heat output of the stock engine at highway speed with no fan, depending only on the forward motion of the vehicle to force air through the radiator - if your engine were overheating under these conditions, the problem would either be more heat than normal (lean mixture, incorrect timing) or less cooling than normal (insufficent coolant flow caused by hoses, pump, radiator).
Another example - an engine that overheats in traffic and parked & idling, but not at highway speeds would point to insufficient air flow through the radiator - which point to a failing clutch fan.
One more thing - define "spews out fluid" - is it boiling over or is it overflowing?
It's normal when the engine heats up to have expansion and fluid being transferred to the overflow bottle (it's actually an expansion tank), and what is supposed to happen is that when the engine cools, the fluid is drawn back into the cooling system - but - a defective radiator cap can hold pressure and allow the expansion but not the return.
Caps are cheap and easy to change, so if your's isn't new or nearly new, and you're not having a violent boil over, change it.