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I don't mean or intend to challenge you, Grande. But for a correctly setup Gen 3 Camry V6, there is only 1 radiator cap. That radiator cap (16 psi capacity) is on the water outlet housing mounted to the engine. The correct radiator for your Gen 3 Camry V6 has no radiator cap. There are no automotive applications, that I am aware of, that use two separate coolant pressure caps. Look at your owners manual, I don't think you will see any reference for a radiator cap on the radiator itself. Check it out at a Toyota dealer, if you want.
What likely happened is, somewhere along the life of the car, the radiator was replaced (given its age, one would expect a radiator replacement). The correct radiator was not installed, evidently. It should not have a radiator cap. Look at automotive parts companies online (like Advance Auto Parts, O'Reilys, NAPA, etc.), and they will illustrate the proper radiator for your application is one that has no radiator cap on it, because your car already has it in the system, only mounted on the water outlet attached to the engine.
On your current setup, where does the overflow from your radiator go?
The water outlet on your engine, just below the radiator cap, has an overflow tube going to your reservoir, where you can see the level of your coolant. Does the overflow on your radiator, below its radiator cap, go to the same reservoir? If so, it must have been altered to accommodate a radiator that has a radiator cap when the original radiator was replaced.
Last edited by 93celicaconv; 04-04-2010 at 10:50 AM.