common sense says heater core will be right into the firewall & you'll see 2 hoses coming out of it

they're 5/8" thick... you can't just stick your hand and feel around back there? (of course, w/ the engine cold)
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yea im going to do pressure test is there some way you can do it yourself or buy something from like autozone
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yeap, rent a tool free loaner program
http://www.autozone.com/autozone/ino...tingAndCooling