answersLogoWhite
Heater Cores and Blower Fans
Isuzu Trucks

How do you change heater core 1990 Isuzu pick up?


Top Answer
User Avatar
Wiki User
Answered 2008-09-09 21:43:00

You've picked an elaborate repair, way more elaborate than it should be. Make sure the core is definitely the problem - you won't want to do this if you don't have to. Remove: steering wheel, all plastic steering column trim, instrument cluster and housing ( speedometer cable is snapped to the back, no tool required just small hands). Remove lower dash panels, some misc heater ducting under the dash, radio, radio mounting bracket, and the dashboard support bracket behind it. Disconnect 2 control cables running to the white plastic heater box (now visible) and 1 running to the air source under the right hand dash. Disconnect cigarette lighter wiring. Disconnect fuse box from dash assembly (drivers side bottom). Remove dashboard - it's held at five more places: the bottom two corners, under two vents at the top dashboard corners (they pull out) and under a plastic cover center top of dash (must be pried out - try not to damage the plastic). Drain engine coolant. Disconnect the two heater hoses from the heater core pipes where they protrude into the engine compartment through the firewall. Best to replace these hoses now, while they're accessible. They're cheap. You can now disconnect the plastic heater box assembly from the firewall and remove it from the vehicle. Remove all of the brass screws holding the box halves together and it will come apart easily. The heater core nests inside, held snug in the box by foam seals. These will often be hardened or disintegrating and if so should be replaced; otherwise air leakage around the core will cause poor heating in winter and heating of the cab in summer. Note: unlike most other cars this Isuzu has no valve in the coolant hose. In this terrible design the heater core is constantly hot and there's no easy way to shut off the fluid flow if the core develops a leak. Many owners will be forced into an immediate and unreasonably expensive dealer repair, which is the whole idea behind this. Assembly is the reverse. Good luck. The only reason you would be reading this post is if you are faced with the task of replacing the heater core. I'll skip the usual points of disconnecting battery, draining as much coolant as possible - I checked the Hayes Manual - their solution was the usual quick sweet way which never seems to work and I did consider the above task as well. Looking for an easier way out this is how I re and re'd the heater core on my 1992 Isuzu P/U Extended Cab without airconditioning. I hope it saves you some stress. The task is not easy, about 4 hrs inside the cab. So we begin: Remove the glove box (easy), remove the lower trim under the glove box (easy), remove trim panel over the radio (easiest), remove the ashtray and ashtray housing (easy), remove the front metal housing the radio slides into (a little struggle), here's the key to removing the heater box through the right side which makes life a whole lot simplier, remove the metal dash support directly behind the metal housing you just removed (it is what prevents the heater box from being pulled out to the right), there are two 10 mm nuts into the floor and two on the top of the bracket (medium) - once you have it out cut off about 1/2 in from the top metal tab (makes it putting it back in easier. Now back to the heater box itself - unplug the power on the heater box, squeeze the accordian box together and pull it out (easy). Unsnap the heater control cables and undo the heater box from the firewall (four 10 mm nuts hold it on). (easy) From the drivers side, slide the bottom black plenium out. At this point there should be nothing from preventing the white heater box from coming out the right side with a little wiggling. Once you have the white heater box removed from the vehicle there are about 15 screws holding it together (you have to take them all out) easy. Replace the core (your new one may require a little foam or something to support it on the sides) I used door draft foam on a roll. The new one will not be an exact match to the old one. The heater box will be in three pieces - screw the whole affair back together, making sure everything lines up and operates nicely. OK - With a little wiggling you will be able to slid the heater box back in - (this is not easy) carefull with the copper pipes, a little easier if you have a buddy on the drivers side guiding it in place. (Hard) Replace the four nuts onto the firewall - this gets the box out of the way for the second most difficult part - putting the metal dash support back in (the one you trimed the 1/2 in from the top tab. Secure the two bottom 10 mm nuts and at least one at the top (small hands help) medium. Replace the front metal bracket (the one the radio goes into ( medium) - Connect the heater controls and snap in the cables. Replace the accordian ducting, plug the electrical connector (easy), replace the trim piece under the glove box (there will an air duct attached to it) (easy) put the glove box, ashtray and radio back in and then the radio cover (easier). Do the engine side hook ups, replace new coolant, connect the battery and hey you saved yourself about $500.00. The secret of whole job is the dash support brack must come out. Good luck, just had to share my morings activities while still fresh in my mind....Cam

001
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0
User Avatar

Your Answer

Loading...

Still Have Questions?

Related Questions

How do you changetheheatercoreina1990eddiebauer?

how do i change the heater core in a 1990 Eddie Bauer


Where is the heater core on 1995 Isuzu Rodeo?

www.tirerack.com


Where can you get a heater core for your 1984 Isuzu P'up Are any other model trucks heater core the same?

beside the engine


Will a heater core from a 1989 4-cylinder 2.6 liter Isuzu Trooper fit in a 1990 V6 2.8?

Should be the same


How do you change a heater core in a 1987 Ford Bronco II?

change out the heater core


How do you change heater core in 98 suburban?

how to change heater core in 98 suburban


Heater core replacement for a 1990 ford e-350?

Remove the water supply lines from your 1990 Ford E3 50 heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.


How do you replace heater core 1990 Ls400LEXUS?

In order to change the heater core on an 90 ls400 you have to remove the entire dash pad and cross bar to be able to remove the heater core box. This is a job for and experienced LEXUS technician www.lextechautomotivellc.com


How do you replace the heater core on a 1990 Chevy Corsica?

Drain the water from your 1990 Chevy Corsica cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.


Why no heat on 1990 silverado heater core I've changed control and thermostat.?

Have you flushed the heater core?


How do you change a heater core on a 1995 eclipse gs?

how do you change a heater core in a 95 eclipse 2.0L


How do you change heater core in 1992 buick skylark?

Im asking how to change the heater core. I don't have the answer.


How do you change a heater core on a 2000 Chevy impalla?

how do i change a heater core on a 2000 Chevy impalla


How do you change heater core on a 1999 ford?

Instualation of a heater core on a 1999 Ford Explorer V6, how do you install the heater core.


How do you change heater core on a 1990 Plymouth acclaim?

This process could take up to 3 hours. The Heater core is best flushed if you are having problems with flow. Is this an option? F. Garay


Where is the heater core 1990 cadillac deville how do you replace heater core Layout of heater core?

comes out inside . remove glovebox and go in that way . about one hour .


How do you change the heater core on a 1988 Isuzu trooper?

Tear the dash out. It may be clogged. Try applying water pressure to the hoses coming of your firewall.


Where is heater core in 1990 Plymouth acclaim 2.2L?

The heater core is inside the Hvac housing, under the dash.


How do you change a heater core on a 2002 Altima 2.5?

how do you change a heater core on a 2002 Nissan altima 2.5


How do you change heater core pt cruzier?

is it a big job to change a heater core on apt cruiser2001 limited


How do you remove the heater core from a 1991 Isuzu Trooper?

do you need to take the dash off


How do you change Audi 4000 heater core?

Remove the water supply hoses from your heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.


How do you change the heater core of a 1997 corolla and what are the symptoms of a bad heater core?

coolant on the floor


How do you replace the heater core on e150 1997?

How do i change the heater core on a 1997 ford e150


How do you change heater core on 2001 ZX2?

Remove the water supply lines from your 2001 heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.