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PEX fittings

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XRogerX

06-26-2007 22:53:20

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The heater core lines went out on my 99 Sable, so I went around the block to inquire about getting some new one. $245! For two rubber hoses, with some steel sections and a crossover hose. Not bloody likely! I bought 6 feet of 5/8" heater core hose, but to prevent sharp bends in the line, I needed some 5/8" brass 90s with barb fittings. I couldn't get proper barbs, so I used PEX fittings instead, which have less prominent edges to the barb section, but nevertheless fit the lines well, and snugged up tightly with hose clamps and the original Ford spring clamps. What exactly are these fittings for? I gather it's some sort of new home heating system connections? Do you think antifreeze will do them any harm? Looked like ordinary brass to me.

As an aside, the repair cost about $30 in parts, plus a couple of hours labour. I pity the people who can't do their own work on their vehicles. I bet I'd be north of $600 in charges if a shop did it. It also vindicates my decision to buy the lower spec Vulcan engined car, since I would have had no choice to bring it to the shop if I had a 32V Duratec in there. They are squeezed in there like sardines in a tin.

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MarkB_MI

06-27-2007 03:15:44

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Re: PEX fittings in reply to XRogerX, 06-26-2007 22:53:20

PEX is "expanded polyethylene" pipe. It's a very high quality plastic pipe that's used in a lot of new construction in place of copper. (Around here, if you use copper in new construction there's a good chance scrappers will get the copper before the house is built.) It's also the preferred pipe for radiant floor heat.

PEX connections are normally used with a ring that's crimped around the pipe. But I see no reason 1/2 inch PEX fittings couldn't be used with 5/8" heater hose. PEX is fairly rigid, which is why the ridges around the barb are small.

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Wardner

06-27-2007 18:17:24

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Re: PEX fittings in reply to MarkB_MI, 06-27-2007 03:15:44

PE is engineer-speak for polyethylene. PEX is an acronym for polyethylene-cross-linked. There is nothing expanded about it. It is made from medium density polyethylene and modified with some sort of radiation. An alternative process adds the chemical silane at some point. Wikipedia has all the data.

I have 75 miles of 5/8" linear low density polyethylene tubing. Let me know if you need some.

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MarkB_MI

06-27-2007 19:16:21

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Re: PEX fittings in reply to Wardner, 06-27-2007 18:17:24

I stand corrected. Cross-linked it is.

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CH(upstateNY)

06-27-2007 03:14:29

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Re: PEX fittings in reply to XRogerX, 06-26-2007 22:53:20

Yes, PEX is for radient or hydronic heating. I buried 1500 feet of it in the concrete slab in my new barn. Antifreeze won't hurt it as I'm using a 38% mix of glycol in my system.

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