Get a manual on your van fron the parts store or AUTOBOOKSONLINE.COM
http://www.vannin.com/
Drain the water from your 1988 Chevy cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. The heater core will come out.
if its like the 1988 u would have to remove the glove compartment and it should be right behind that, ask a mechanic to make sure ,
To replace a 1988 Dakota heater core, first discharge the A/C. Then remove the lower instrument panel before removing the heater box unit.
First remove the right front speaker and cover then remove the top bolts in the heater box and the remove the heater hoses out front in the spare tire compartment. Then remove the two straps holding the heater core in place. Reverse order for installation.
Inside of the car. Remove the glove box.
The dash has to be removed to gain access to the heater box. The heater box then comes out and is split open to replace the core.
Drain the water from your Dodge Ram truck cooling system. Remove the water lines from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
under your driver side dash. you may have to remove the kik panel
A "heater" or a "heater core"?
Remove the positive battery cable from your 1988 Chevrolet 1500 pickup truck battery. Remove the cables from the front of the starter. Remove the starter retaining bolts. Reverse the process to install your new starter.
The 1988 Chevy G 20 Van heater core can be found behind the passenger side kick plate. You will need to remove the kick plate in order to access the heater core.