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Does anyone know of a replacement for the heater core for this or the pups, one that matches since the one in question is discontinued? Most dealers do not have it and it cost as much as my truck when they do. Also the same leak mine had is found in the ones at the yard.Any help???Anyone delt with this problem. Thanks

I think you have the same core as was used in the early Troopers. I had a bad leak in my 86 Trooper and fought with getting it fixed. Some Isuzu engineer had the bright idea to use plastic ends on a metal core and it seems like they all leak. I never did find any place with a replacement, though I saw a NOS Isuzu core go for $400 on ebay. One shop in town swore they could get it for $140, but found out different when they tried to get one in.

I finally found a good looking core for $40 in a yard that leaked when I put it in. It was better than what I had, but still not righ. I got fed up at that point at dumped some Bars Leak in it and it has held up for a couple years now. If you do that though, flush the cooling system first, bars leak will contribute to clogging if your cooling system is already somewhat gunked up. I've flushed the Trooper twice since treating it, and did not put any more barsleak in it either time, the core is still holding up. Some people prefer the aluminum radiator sealers, I dunno which would work best here. Original Bars Leak is pretty lightweight stuff so I think it might flow through to the heater core a bit better, but that is just a guess. Just stay away from the heavy duty stuff for cracked blocks/heads. I doubt they work well for big cracks anyway, but I bet they'd clog your cooling system much worse while they tried.

Forgot to mention that I had the same trouble with an 83 Pup my wife used to own. I had the core bypassed, but hooked it up again when we sold the truck and dumped a whole bottle of that stuff in there. I ran into the truck with yet another owner a while later and he said it still worked and didn't leak. Sometimes this stuff actually works.

I have located a all metal heater core of the same size in the yards then taken the to the radiator shop. For $90.00 the shop eliminated the valve and directed the inlet\outlet to the correct location. A $20.00 inline heater control valve located right under the air cleaner with a choke control cable through the firewall will with a minor bracket system will hook up to the original control slide in the dash. That leaky valve problem and wet floor mats are solved for good and no one knows any different.

My buddy junked the o.g. core, errrr, but that is some helpfull stuff if we find one at a yard, which knowing these pieces of dung, won't work either. We tried the stop leak type stuff but it did not work for us. Thanks though.