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Isuzu Trooper Heater Core

12 messages,  Last post on Sep 04, 2010 at 8:26 PM

You are in the Isuzu Trooper Forum.

What is this discussion about? Isuzu Trooper II, Heating / Cooling, SUV

Messages Page 2 of 2

#3 of 12 Re: 93 Trooper - Changing Heater Core ??? [gruntbuggly] by jkung

Dec 07, 2006 (9:34 pm)

Replying to: gruntbuggly (Oct 08, 2006 2:36 pm)
Hi: I just joined this group hoping to participate in the discussion. I am in the process of changing my 93 Trooper heater core . Have you found the info that you needed ? I have the factory service manual which is very detail and useful.
I am however get stuck on the removal of the two water hoses connected to the heater unit outside of the firewall. Do I need to get the clamps from under the vehicle ? I can see/feel the clamps but do not have ebough room from the top to disengage the clamps/hoses.
 
The heater core assembly with the "White Plastic housing" is made up of three pieces. If you require further details, please email me and I will send you the details.
 
For now.. those two hoses are holding me back. I have removed the dash and attachments from the inside already.
 
BTY, where did you buy your new heater core ?
 
Thanks.
 
James

#4 of 12 Re: 93 Trooper - Changing Heater Core ??? [jkung] by gruntbuggly

Dec 09, 2006 (9:08 am)

Replying to: jkung (Dec 07, 2006 9:34 pm)
I did finally work this out on my own. I never got a good set of disks for the Trooper, but I finally got "bloody-minded" about it and dove in!
 
The hoses from the engine to the heater core - I undid the motor side connections first, then got some ridiculously long needle nose pliers (cheapo ones from Sears Hardware) to undo the clamps from the heater core itself. This wasn't impossible from the top side, maybe your clamps are on crooked, or the wrong way around! BTW, a shorter handled set of angled needle nose pliers was needed to get the second (lower) clamp off.
 
I ordered the heater core from a place listed on car-part.com. There were several available, I got one from a salvage place in Michigan (eww, I'm from Ohio!), but it was in pristine condition.
 
A couple side notes -
 
1) I did have to take the white air handler apart to get the old core out, and needed to keep it apart to get the new core back in. It's a pain, but it did work.
 
2) There are two small hose pipes that stick through the firewall that need to be removed from the old heater core and attached to the new one. TRY NOT TO BREAK THEM!!! I did crack one of them trying to get the new core into the car, but I epoxied it, put electrical tape (just a little) around the outside, and prayed that the hose clamp could keep it all together. (It has for over a month now!)
 
3) To me, the hardest part of getting this back together was getting the new heater core back into place with the pipes through the firewall. The insulation on the outside of the firewall will fight against you, and the interior housing for the air-conditioner coil will be in the way. Loosen it all up and nudge it as far to the right as you can!!! It will eventually push through. Once it's back through and in position, I put on the front of the white air handler, and got the hoses connected up.
 
4) Watch for this!!! Once I got it back together, I tried to drive it to work the next morning. On the way, I saw that my temp was rising way up! It turns out that my thermostat was stuck shut. Since the heater core is in the loop with the engine, it is my nagging suspicion that this caused the heater core to blow in the first place. I had steam pouring out at the passenger seats floor! The thin aluminum in the heater core was the easiest place for the steam to blow out. I'd at least check this, or just replace the old thermostat while you've already got the system drained. A new one was $13.00 at NAPA.
 
Good luck! Post again if you have more questions! Good Luck!!! chris

#5 of 12 85 trooper ll heater core by arloi

Feb 22, 2007 (3:52 pm)

Guess that I'm in for a long job on this one. See by other post that the dash is being removed. Is this a must? I have taken off every clip and nut in sight and still haven't move the heater. thanks for any tip on this. I have yet to find a new core. will try the car-parts.com that was refered to in one of the post. Notice that a flaper arm was broken that need to be replaced. Maybe can find one at a salvage yard. Thanks for any tips and advice.

#6 of 12 Re: 85 trooper ll heater core [arloi] by gruntbuggly

Feb 23, 2007 (7:41 am)

Replying to: arloi (Feb 22, 2007 3:52 pm)
Yes, the entire dash needs to come out. At least on the '93 Trooper. The heater core is never supposed to need replacing, so there's no shortcut to doing it. Yes, I'd check local salvage yards as well. You'll probably need to get the whole air-handler body from the salvage yard, and likely have to go there and remove it yourself. Still, it'll be good practice! Good luck! chris

#7 of 12 heater core. by arloi

Feb 25, 2007 (11:16 am)

Not knowing what to expect, when I get the hearter core removed. Is it possiable to have it repaired. Or would that not be recommended. I have located one at a salvage yard, I would have to remove it and would not know the condition of it. Price is right $10. The guy told me it fits 84 thru 88. Isuzu dealer quoted me a price of $294. for new one.

#8 of 12 Re: heater core. [arloi] by arloi

Feb 25, 2007 (6:21 pm)

Replying to: arloi (Feb 25, 2007 11:16 am)
Well, I have it out, and can see that it has a plastic fram with metal cores and fins. Don't think it can be repaired. Unless there is a very good glue made for it. It dosen't look like it is in too bad of shape.

#9 of 12 Re: heater core. [arloi] by gruntbuggly

Feb 26, 2007 (10:25 am)

Replying to: arloi (Feb 25, 2007 6:21 pm)
Maybe a radiator place would fix it, but I doubt it. Good luck! Cheer up! You're half way done!

#10 of 12 Re: heater core. [arloi] by boxtrooper

Feb 26, 2007 (8:13 pm)

Replying to: arloi (Feb 25, 2007 6:21 pm)
A really goos radiator shop might be able to make you a new one using just your end caps or even fabricate new end caps also. Its worth asking.

#11 of 12 Heater core by arloi

Feb 28, 2007 (11:10 am)

Went down to a pic-and -pay salvage yard. Found an 88 trooper with a heater core. Taking a chance with it, but only $10., maybe I will be lucky. Will go have it tested before I install it. Also found out the 81-82 chev luv used the same core. The salvage yard can give a lot of info, in regards to what different vehicle use the same parts. Also picked up a couple of dash vents for $1 each. I'm not proud. They look better than my broken one. Now when the sun shines again, I'll have something to do again.

#12 of 12 heater core..help by mthaner

Sep 04, 2010 (8:26 pm)

I have a 90 trooper which I purchased with out a heating core installed, supposedly leaked.., thought it would be no problem to replace.. I cant even find one for a 90, with out paying over 400. and waiting several weeks to arrive from Japan.. is there a substitute ( Mitsibushi Montero ) part I can use, I even heard maybe Chevy S10, any help would be apperciated...

Messages Page 2 of 2

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