Topic: Heater core bolts

[95yjman]

I'm trying to remove my heater core out of my 95 YJ.  Its down to get getting the box out itself. How many bolts are there and where are they at in the engine compartment area? Anybody know of any write ups? Thanks for any help!

[Bikerjr1]

If I remember right there are 4 of them.  You should be able to see all of the on the firewall once you remove the battery box.  You might also have a tight spot inside by the radio antenna.  I removed mine when I pulled the unit out of my '93.  It made it easier to put back in, but the antenna is a pain to put back.  There are some pictures search here and over on Jeepforum.
JR

[sharpxmen]

I'm trying to remove my heater core out of my 95 YJ.  Its down to get getting the box out itself. How many bolts are there and where are they at in the engine compartment area? Anybody know of any write ups? Thanks for any help!

this is from the FSM (unfortunately there's no picture for YJ, only for XJ and they're different)

HEATER CORE AND HOUSING
REVIEW ALL WARNINGS AND CAUTIONS IN
THIS GROUP BEFORE PERFORMING THIS
OPERATION.
REMOVAL
(1) Drain coolant from the radiator.
(2) Disconnect heater hoses.
(3) Disconnect vent door cables.
(4) Disconnect blower motor wire.
(5) Disconnect defroster duct.
(6) Remove nuts that attach the heater housing
studs to the engine compartment side of the dash
panel.
(7) Remove heater housing assembly by tilting it
downward, to disengage it from the defroster duct.
Pull it rearward and out from under the instrument
panel.
( 8 ) Remove heater hosing cover from the housing.
(9) Remove heater core from the housing.
INSTALLATION
(1) Install the heater core into the housing and install
the cover on the housing.
(2) Position heater housing on the dash panel. Be
sure the housing studs all extend through the dash
panel.
(3) Install the seals on the heater core outlet and
inlet tubes and over the blower motor housing.
(4) Install attaching nuts on the housing studs.
CAUTION: DO NOT over tighten the attaching nuts.
The housing could become distorted causing air
leaks and improper heater door operation. Tighten
the nuts alternately and evenly until 2 stud threads
are visible beyond each nut.
(5) Connect defroster duct to the housing.
(6) Connect blower motor wire.
(7) Connect vent door control cables.
( 8 ) Connect heater hoses.
(9) Fill cooling system.
(10) Check system operation.
BLOWER MOTOR (HEATING)
REMOVAL
(1) Remove heater housing.
(2) Remove blower motor-to-heater housing attaching
screws
(3) Remove blower motor from the housing.
INSTALLATION
(1) Position blower motor into housing.
(2) Install and tighten blower motor-to-heater
housing attaching screws/nuts.
(3) Install heater housing.
(4) Check blower motor and heater operation.

[jdarg]

You are looking for four nuts that were roughly 12-3-6-9 o-clock with the battery tray at the 9 o-clock looking under the hood. They all have star washers on them and some of them may be serving double duty holding wiring or vac lines in place too IIRC.

If you live in the rust belt be careful taking off the nuts...the studs break easily so try to clean them w/ wire wheel etc before loosening.

[95yjman]

Thanks guys for the help! and yep I found out first hand that they break easy. Broke two of them off

[jdarg]

If you don't have a welder you can get a female/female connector of the same thread from a hardware store to fix it if there is still enough left to grab onto that (there was on mine, it still had about 1/2" of the stud left.) Then just put a rubber washer & reg washer between that and the firewall and it will fit like a dream.