i see where your coming from now. but who reaches back to open the bottle? Shit... crank the car in the morning flip the warmer on....purge the system. And there you have it all the time!!! LOL Sorry if i'm being a smartass. Just how I see it. Well a swap only takes a couple hours. I love working on my car. Still trying to finish this bitch! Think I could build one blind folded( not really) but close to it! So simple, but yet complicated! Buy the way!!! I F%$$%^^& HATE PLASTA-GAUGE!!!!!