How to change heater core on 1988 jeep wrangler

SOURCE: 94 jeep wrangler overheating

Have the cooling system pressure tested. If it holds pressure, that's a good thing. If it doesn't hold pressure, you may have a leaking head gasket. What may be happening is the crack in the head gasket could be blowing hot air into the cooling system causing it to overheat.

SOURCE: heater 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.

SOURCE: VACUUM HOSE DIAGRAM FOR 1988 JEEP WRANGLER 4.2 I6?

here is a link with all the vacum diagrams for your jeep. hope it helps.
http://www.autozone.com/addVehicleId,1076002/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528008ab9d

SOURCE: 2000 Jeep Wrangler heater core

When I drive my 2000 Jeep Grand Cherokee I can hear water. I was told to blow out the lines of the heater core with a compressor. Where is the heater core located?

ZJ Limited

• 17989 Answers
• Posted on Sep 16, 2009

SOURCE: how to replace heater core in a 1988 jeep

Jeep Cherokee XJ Heater Core

Work for '92 models, but can use it like a reference guide.



Figure 1

1. Disconnect battery ground cable, then drain cooling system.
2. Disconnect hoses from heater core.
3. If equipped with A/C, remove evaporator/blower housing as follows:
   1. Discharge A/C system, then disconnect hoses from expansion valve.
   2. Disconnect electrical connector and vent tube from blower motor.
   3. Remove console, if equipped.
   4. Remove lower instrument panel attaching screws, then the lower panel.
   5. Disconnect electrical connections from A/C relay, blower motor resistors and A/C thermostat.
   6. Disconnect vacuum hose from vacuum motor.
   7. Cut evaporator/blower housing to heater core housing retaining strap, then disconnect heater control cable.
   8. Pry retaining clip from rear of blower housing flange, then remove the three retaining screws.
   9. Working from engine compartment, remove evaporator/blower housing attaching nuts, then the evaporator drain tube, Figure 1.
   10. Remove right kick panel, then the instrument panel support bolt.
   11. Pull right side of dash outward, then rotate housing downward and towards rear of vehicle until studs clear dash panel. Remove housing from vehicle.
4. Remove heater core to housing retaining screws, then the heater core, Figure 2.
5. Reverse procedure to install.