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Hey guys, Today, I was inspecting my car and realized there doesn't seem to be a radiator cap, unless it is somewhere deep under the fender over the radiator.

However, I also realized the overflow bottle is basically contained within the pressurized coolant system. It has a screwed cap that is rated for 21 kPa. Does that mean the cap of the overflow bottle basically acts as the radiator cap?

On my older Jeep GC WK, the overlow bottle cap is simply a no screw cap and the bottle is not pressurized. You can open the cap on the bottle while the engine is running as the radiator cap keeps the pressure of the overflow bottle and sends or receives the excess fluid in a controlled manner.
 

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Yeah this trend has been going on for a long time, at least back to 2002 (that is the oldest vehicle I have worked on which had no radiator cap and pressurized reservoir system)
 
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