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mkmac · 04-07-2016, **(Subject: Disappearing Coolant )**

(03-27-2016 )DrivingZiggy Wrote: Yeah, found the coolant leak. It's the sleeper heater core. Well, maybe just the o-rings. But I bought a new core. Surprisingly, it didn't come with o-rings. So we went to the nearest O'Reilly's and got a couple that fit. No good. So we put the old ones in. Still no good.

Now, the old ones looked like some kind of "step down" type of o-ring. So I then went to the dealership and got the "correct" o-rings and they look to be quite similar to the O'Reilly's ones, just maybe thicker. So the parts called a mechanic up front. He said that sometimes the clamp that holds the tubes into the core bend. So I also picked up one of those. Discussed the job with my nephew, and we're gonna try. Perhaps these new o-rings are a "crush" type? We'll see. We're gonna give it a shot at noon--a couple of hours away.

Oh, and the entire system really didn't look so bad. Really not all that much soot. A small amount of corrosion around the actuator which the dealership wouldn't sell me because it's part of the entire EGR valve and costs over $900. Cleaned everything anyhow and replaced sensors. Painted the intake, venturi, and sleeve while they were out. Scraped as much paint off of the bolts as we could, so they now are nice and shiny. I hope they don't rust!

So everything went back together nicely--you never know if it will when I'm working on something! And she cranked just fine with the new batteries. But I didn't run her for very long because of the leak. I hope the new o-rings are what we need.

In regards to your heater core you need the right one's from the dealer they are blue coated I believe the coating will come off with handling(only so you can't return used ones)they are not crushed they are round your old ones looked like that cause they are shot,your aluminium pipes are very thin they bend very easy.you may have to bend them slightly to get them to seat right.also try to seat the pipes in their holes the best you can, then put the plate back on the plate need a slight concave look to it. about 1/16 max this will insure proper pressure on the flange around the pipes. then watch as you tighten the screw that the flange will be flush with the heater core. you should only see a slight bit of the flange on the pipes when finished, and the o rings are metric O'Reilly's won't have them. your dealer must have the right or at least go to a bearing supply store..........