ronandsue74 Report post Posted July 26, 2012 The coolant expansion tank reservoir cap (radiator cap) on my 05 Inspire is a 16 lb cap. A 16 lb pressure cap seems rather high to me. My engine is the Cat C9 serial #9DG01439. I am the second owner so I don't know if this is the original cap. Feedback is appreciated. Thanks, RJ 05 Inspire #51264 Share this post Link to post Share on other sites
Riotravelers Report post Posted July 28, 2012 Use vin and engine serial number and go to chasis manufacturer first and engine manufacturer second. Share this post Link to post Share on other sites
