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it is alot of work. you will have to empty your a/c system as well so if you have working a/c it will have to be recharged when you are done. 1)discharge refrigerant gas. 2) dissconnct the negative battery cable. 2)drain the radiator. 3)remove the dash. 4)disconnect the a/c lines going through the firewall.(cap all open ends to keep dirt out). 5)disconnect heater hoses that go through firewall under hood. 6) under hood,remove the screw attaching the air inlet duct and blower housing support brace to the cowel top panel. ( 7)disconnect the black vacuum supply hose from the inline check valve under the hood. 8)disconnect the blower motor wiring. 9)under the hood remove the 2 nuts holding the evaporator case to the dash panel. 10)in passenger area remove the screw attatching the evap. case support bracket to the cowl top panel. 11)remove the nut holding the bracket below the evap. case to dash panelpull evap. case away from dash panel and remove the evap case assembly. 12)remove the 5 screws from the heater core access panel and pull the cover. 13)lift out the heater core and seals from evap. case. its going to be a pain i have a blown heater core in my 88 also ,so i will have to do the same thing.

pretty much spot on heres a site with a walk through and pictures to

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โˆ™ 2009-12-09 06:03:00
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Q: How do you replace the heater core on a 1988 Ford Thunderbird?
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