How do I replace the heater core in my 1994 Isuzu Trooper?

SOURCE: heater core replacement

Actually if your handy the heater core on this car is pretty easy..  passengers side under the dash... but here is a link to some sites that will probably help  
from .... one of the wikki sites.. LOL cant remember which now

The heater core is located under the dash, in the center above the "hump". The container holding the core looks like a black plastic box. Remove the ash tray for easier access. You may have to also remove some other covers under the dash. First drain the radiator. Then you have to disconnect the hoses. There are two hoses connected to nipples of the heater core that are thru the center of the firewall. This has to be done from underneath the car while raised. I also had to unbolt a frame support to get to the hose clamps (I have big hands; you may be able to reach them without unbolting it). Remove the screws that hold on the cover to the heater core. You should be able to get the old one out now. Just go in reverse order to put it back together.

also this link is very handy they have a pretty complete collection for MANY vehicles
http://www.autozone.com/shopping/repairLanding.htm

SOURCE: replace heater core 1994 chevy g20 conversion van

Here a are the instuctions to remove it. I did not know if you have A/C or not so I included both for you.

REMOVAL & INSTALLATION
Without Air Conditioning
ALL MODELS
See Figure 1

1. Disconnect the negative battery cable.
2. Remove the coolant recovery bottle.
3. Place a pan under the van and disconnect the heater intake and outlet hoses. Quickly remove and plug the hoses and support them in an upright position. Drain the coolant from the heater core into the pan.

1. Remove the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw. Remove the duct.
2. Remove the engine cover.
3. Remove all the instrument panel attaching screws.
4. Carefully lower the steering column. Raise and support the right side of the instrument panel. Refer to for further details.
5. Remove the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
6. Disconnect the temperature door cable. Carefully fold the cable back and out of the way.
7. Remove the three nuts from the engine compartment side of the distributor case and the screw from the passenger compartment side.
8. Remove the heater case and core assembly.
9. Remove the core retaining straps and remove the core.

1. Install the core.
2. Install the core retaining straps.
3. Install the heater case and core assembly.
4. Fasten the three nuts on the engine compartment side of the distributor case and the screw on the passenger compartment side.
5. Connect the temperature door cable.
6. Install the defroster duct-to-case attaching screws and the two screws attaching the distributor to the heater case.
7. Install the steering column.
8. Fasten all the instrument panel attaching screws.
9. Install the engine cover.
10. Install the duct. Install the heater distributor duct-to-case attaching screws and the duct-to-engine cover screw.
11. Connect the heater intake and outlet hoses.
12. Fill the cooling system.
13. Install the coolant recovery bottle.
14. Connect the negative battery cable.

1. Disconnect the battery ground cable.
2. Remove the engine cover.
3. Remove the steering column-to-instrument panel bolts. Lower the column carefully.
4. Remove the upper and lower instrument panel attaching screws. Remove the radio support bracket screw.
5. Raise and support the right side of the instrument panel.
6. Remove the lower right instrument panel bracket.
7. Remove the vacuum actuator from the kick panel.
8. Disconnect the temperature cable and vacuum hoses at the case. Remove the heater distributor duct from over the engine hump.
9. Remove the two defroster duct-to-firewall attaching screws below the windshield.
10. Under the hood, disconnect and plug the heater hoses at the firewall.
11. Remove the three nuts and one screw (inside) holding the heater case to the firewall.
12. Remove the case from the van. Remove the gasket for access to the screws holding the case together. Remove the temperature cable support bracket. Remove the screws and separate the case. Remove the heater core.

1. Install the heater core.
2. Assemble the case and fasten the screws.
3. Install the temperature cable support bracket.
4. Position the gasket, then install the case in the van.
5. Fasten the three nuts and one screw (inside) holding the heater case to the firewall.
6. Connect and plug the heater hoses at the firewall.
7. Fasten the two defroster duct-to-firewall attaching screws below the windshield.
8. Install the heater distributor duct.
9. Connect the temperature cable and vacuum hoses at the case.
10. Install the vacuum actuator at the kick panel.
11. Install the lower right instrument panel bracket.
12. Fasten the radio support bracket screw.
13. Fasten the upper and lower instrument panel attaching screws.
14. Fasten the steering column-to-instrument panel bolts.
15. Install the engine cover.
16. Connect the battery ground cable.
17. Refill the cooling system as necessary.

SOURCE: Starter removal - 1994 Isuzu Trooper

pull the starter away from the bellhousing and turn the drive end upwards then it will come out from the engine compartment tight i know but i have just done mine so i know it will come

Charles McElchar

• 389 Answers
• Posted on Sep 28, 2009

SOURCE: change a cv boot on a 1996 isuzu trooper

First their are two different front axles in 1996 troopers. Isuzu changed the 4wd system from auto lock hubs to drive control axle.auto lock hube are on the older trooper's with the light and wiper switches on the dash. The same way to change both. Auto hub remove the six hex. screws slide off the hub remove the sirclip from the driveshaft. Newer hub has 6 alan-head screw's again remove them then the hubcap then the sirclip on the shaft and slide off the round spacer. Next 4 bolts from the lower balljoint and the brake's. Pull out the hub until it clear's the shaft remove the inner boot clips slide the inner boot out the shaft. Clean the grease from the end of the axle then with your fingernail feel along any of the 3 tracks in the axle and near the outer end of the track you will find a wirelike split ring slide a screwdriver under the ring and lever it off . Pull out the drive clean off the grease. You will see a sirclip on the end of the joint remove it and slide off the joint. You can replace either boot from that end. The outer joint is held on with a snap ring on the shaft inside the joint and is not easily removed need a hammer and drift to drive off the end and when removed its hard to get the snap ring on the shaft back into its place.You can change both boots from this end as well. Cheers

SOURCE: How to replace a heater core in a 1994 chevy 1500

As with all vehicles it seems the first part that they build around is the heater core. It is under the dash above the floor housed in a black plastic sealed box. Sealed with goop. Locate that box and start removing everything around it that is peventing taking the cover off. Of course disconnect the heater hoses under the hood a thefirewall.

Warning it is never as easy as it sounds.