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It could be thermostat, radiator or water pump.

AnswerBad or no thermostat, bad water pump, plugged radiator, plugged water jacket, loose fan belt, bad clutch fan, radiator too small for application.

Also try bleeding the coolant system of air.

is the coolant fan electric or manual?

What make and model vehicle is this 305 in?

if its a 3rd gen firebird or camaro, check for blockage between the condenser and radiator

[air blockage] leaves and junk get trapped in between the two pieces. flush out with water hose or air pressure. good luck

Addition:

I had a 305 that had a thermostat stuck completely open, it overheated because the coolant went through the radiator so fast it didnt get cooled off. For like $20 its a good first step.

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โˆ™ 2011-09-13 23:43:18
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Q: Why does a 305 engine always over heat the coolant is NOT leaking?
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If you mean engine coolant is getting into the car, the heater core is leaking coolant causing the coolant level to drop and that causes the engine to over heat.


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If coolant is leaking from a car it means that your radiator has a hole in it. If this is not fixed the car will over heat.


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The heater core is leaking coolant.


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You could be leaking coolant, your blower fan might not be working, etc.


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By the way of using coolant oil......................


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