Overheating

Drag0na5h · 06-30-2007, 04:23 PM

I would drive my car home from work everyday and my overflow would take a massive leak all over the ground as soon as I would turn off my car and get out to see it. Well turns out the problem was my radiator cap. The seal was messed up and wouldn't hold the pressure thus sending fluid back into the overflow reservoir. This happened however, after replacing the water pump and thermostat which I believe both had gone bad.

igosaur · 06-30-2007, 04:33 PM

Great, I'll try this first as it's the cheapest and easiest to do

Also, thinking about it the radiator cap does look a bit dodgy..

Thanks.

Quote:

Originally Posted by Drag0na5h

I would drive my car home from work everyday and my overflow would take a massive leak all over the ground as soon as I would turn off my car and get out to see it. Well turns out the problem was my radiator cap. The seal was messed up and wouldn't hold the pressure thus sending fluid back into the overflow reservoir. This happened however, after replacing the water pump and thermostat which I believe both had gone bad.

cre · 06-30-2007, 06:40 PM

Yeah, a bad radiator cap will have your coolant system purging all day long (or until it reaches the point where there's more steam than anything in the coolant system.

The radiator cap is a relief valve. The one our cars come with are largely dependent upon a preset amount of elasticity in the spring. As the spring ages and anneals from the constant heat cycling if begins to open at lower and lower pressures.

BTW - The temperature representation provided by the temp gauge is logarithmic. The temp can go pretty high with little to no movement, even up to arguably hazardous temps. If your temp gauge jumps into the red stop the car ASAP.

06-30-2007, 04:23 PM	#1
Drag0na5h 3" Exhaust Join Date: Jul 2005 Posts: 67	I would drive my car home from work everyday and my overflow would take a massive leak all over the ground as soon as I would turn off my car and get out to see it. Well turns out the problem was my radiator cap. The seal was messed up and wouldn't hold the pressure thus sending fluid back into the overflow reservoir. This happened however, after replacing the water pump and thermostat which I believe both had gone bad. __________________

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06-30-2007, 06:40 PM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Yeah, a bad radiator cap will have your coolant system purging all day long (or until it reaches the point where there's more steam than anything in the coolant system. The radiator cap is a relief valve. The one our cars come with are largely dependent upon a preset amount of elasticity in the spring. As the spring ages and anneals from the constant heat cycling if begins to open at lower and lower pressures. BTW - The temperature representation provided by the temp gauge is logarithmic. The temp can go pretty high with little to no movement, even up to arguably hazardous temps. If your temp gauge jumps into the red stop the car ASAP.