For switching to standard heater hoses: just leave the coupler in, but remove all the innards (clips, o-rings and spacers; be sure to get them all). That way, 5/8 heater hose fits semi-snug. If you take out the coupler then there will be a big hole in the firewall. Cut the metal pipes shorter and then use enough hose so that there are no kinks. Use a heavy duty hose so it does not kink.
The no-coupler setup has been posted about quite a few times, if you do some searching you can see the various ways people have solved it.
1998 Volvo C70 Overheating and fog on windshield
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erikv11
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Re: 1998 Volvo C70 Overheating and fog on windshield
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6
153k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 197k
'07 XC70, black, 205k
'07 XC70, willow green, 212k
'99 Camry V6
153kgone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
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