How to remove heater core 93 jeep yj - Wrangler Jeep Cars & Trucks

ZJ Limited

• 17989 Answers
• Posted on Oct 20, 2008

SOURCE: how to remove heater core

Is a typical case, but we can use like a general method:
First remove all the water from your system by draining the radiator, it's best to do it this way so you can add new coolant and keep the mess to a minimum, after your water is drained, go ahead and remove the heater core feed lines.

1. Remove top of dash pad, do this by removing several screws located under the foward lip of the pad, don't forget the screws in the defroster vent holes!
2. Remove the lower trim panel from the underside passenger side dash ( if there is one there)
3. Look under the dash on the passenger side and you will see the plastic box in which houses the heater core, remove all the screws that surround this box, there will be one screw on the top that will be very difficult to get at, this is why you have removed the top of the dash so you can get at it with two hands,if you need to see this screw get outside of the car and look down at the dash from the passenger side and then your going to have to depend on feeling with your hands.
4. At this point you should have the plastic box off and now your looking directly at the heater core, the core is held in place by a steel clamp fastened with screws, remove these screws, and remove the clamp.
5. Now it's time to remove the heater core , get some plastic sheeting and lay it around the passenger foot well because there going to be some water in the core yet, pull it out gently, you might have to wiggle and gently pull, take your time, it should come out fairly easy.
6. Once you have the old core out, it's time to install the new one, I can't tell you how important it is at this point to be very patient when installing the new core, you may have to slightly bend the new core tubes to get them through the firewall, you may end up taking it out a couple of times BE CAREFULL!!!!!!
7. Once you have sucessfully got the core in place, install the core clamp, then re-assemble

SOURCE: can't remove dash to replace heater core in 2004 jeep grand chero

Need more info.
Where is your hang up? If I remember correctly the Jeep dash pad (all of the plastic) comes off first then if you need more access, the metal structure of the dash comes out. Make sure you un-bolt and un-plug the Passenger Air Bag because that comes with the dash pad. DISCONNECT THE BATTERY while the air bag is disconnected and make sure your body is grounded while you un-plug and plug in the air bag!!!

SOURCE: removing heater core from a 93 chevrolet blazer

heater core under dash passenger side . Remove 2 hoses on fire wall carefully then take cover off the heater box & remove heater core. be careful not always an easy job!

SOURCE: Heater Core replacement

yes you do have to disconect the a/c system.google dash removal for jeep.hope this helps

Vincent G

• 2363 Answers
• Posted on Dec 03, 2009

SOURCE: high idle on 93 jeep yj 4 cly no vaccum leaks

Don't forget to check/test the coolant temperature sensor.

The computer (ECU) check the resistance value from the coolant temp. sensor.

If it's out of range then the computer (ECU) will not idle down the rpm.

Also check the condition of the wiring lead from the sensor to the firewall.