Blogs Car Info Our Show Deals Mechanics Files Vehicle Donation

Engine over heating problem

I have a 1993 Toyota Camry V6LE with 197000 miles. Recently I have replaced radiator, thermostat, hoses, water pump, timing belt etc. When engine runs first 30 minutes the temperature shows normal, after that the engine gets over heated and the coolant starts boiling and comes out from the plastic resorvoir tank bleeder vent.

The coolant circulation is OK, thermostat, water pump, fan, temeperatur gauge all seem working. No white smoke from exhaust or no coolant leaking.

I am afraid of taking the car on the road. Please help. Thanks.

Are the cooling fans working?

There may be a restriction in the heater core or hoses.

Bleeding the air from the coolant system can be tricky. Air in the system can cause overheating. There are, probably, two places to bleed the air out. Use the repair manual you may have “forgotten” to buy before, to find the bleed points.

Thanks. But the engine cooling system has a plastic resorvoir tank that has pipe connection with both engine jacket top and the radiator and also has an overflow pipe. Is not that a bleeder? Or are you talking about air trap inside the radiator?

Yes, the fan is working.

Yes, the fan is working well.

There may be air trapped in the cooling system. Here’s how to purge the air out.

Get the engine up to operating temperature. With the engine idling, slightly loosen the upper radiator hose clamp. Take a flat bladed screwdriver, and slip it between the upper radiator hose and the radiator hose neck. Allow the engine to idle until all that comes out of the upper radiator hose is coolant. Retighten the clamp and check the coolant level.


Thank you so much. What if I take the car to a Jeffylube for a radiator service where I suppose they flush the cooling system by air pressure and refill the coolant. Do you advise that?

No, they’re likely to really screw it up. Find a real non-chain local mechanic.