heatert core is leaking
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1990 Chevrolet G Series Van (G20)
Question: how do i replace heater core
Answer #1ZeeTech March 17, 2011, 05:48Master
Answer #2guitarslayer April 25, 2012, 12:40Rookie
drain coolant,disconnect the 2 hoses to core on engine side of firewall,inside you will have to unscrew majority of the passenger side of dash and prop out with a piece of wood etc. to access core and open up heater box.remove screws to core. remember how you get core out of box and re-assemble.you will have to play with all those lines etc. that get in your way,etc. good to have a 2nd person to help guide from opposite side of firewall. took me 4 hours in a freezing garage. good luck!!