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A "heater" or a "heater core"?
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.
Take the glove box out. Look in behind. Have fun -- it's not a nice job.
you need to take apart the lower dash on the passenger side. This is not a fun job.
To replace a 1988 Dakota heater core, first discharge the A/C. Then remove the lower instrument panel before removing the heater box unit.
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.
There is a fuse for the blower motor on the fuse panel, I do not know of a relay.
http://www.coolcats.net/tech/troubleshooting/heatercore.html
the heater makes the core get realy big so that the sun can get realy huge and shine brighter
If you are asking about the heater blower motor it is mounted to the heater ducting in the engine compartment on the passenger side.
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.
You have to pull the dash and all the lower fascia, then remove the box that houses the heater core. Take the clamps off the heater hoses from the engine compartment side of the firewall and disconnect the heater hoses. Disconnect the bracket that holds the heater core in place from the inside of the passenger compartment (if present.) Carefully remove the heater core and discard it. Install a new heater core reversing the above steps.