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Old 01-21-2009, 06:38 PM   #1
knox
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2002 L-Series 3.0L Sedan
Default O-rings for heater core?

Hello I read on here about using O-rings from a hardware store to fix a leaking heater core. The size I have is 1" O.D. 3/4" I.D. and 1/8" thick. And I can't get the pipe to fit with the new O-rings. They are too big! Were do I find the correct size? Now I seen that I need 1" O.D. 9/16" I.D. and 1/8" thick. Is this the right size? I have went to Ace, Lowe's and Auto Zone. Any help would be appreciated.

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Old 01-22-2009, 12:47 PM   #2
GregS&L
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2001 L-Series 3.0L Sedan
1995 SL2
Default Re: O-rings for heater core?

Welcome to the board.

When you say the pipe will not fit, is it because the inside diameter of the o-ring is too small for the pipe or is the outside diameter of the o-ring too big for the heater fitting? Believe 1" O.D. 3/4" I.D. and 1/8" thick is the correct size. I measured my old o-rings and that was the correct size, although the OD was closer to 15/16" - probably smaller due to compression.

Did you lube the o-rings, the pipe and the fittings with Teflon paste or silicon grease before installing? It is a tight fit. When I did mine a year or so ago, I could not get the pipe, the o-rings and the clamp to bottom out in the heater fitting without lubrication. Once I got it all (with some wiggling and pushing) it has not leaked a drop.

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Old 01-24-2009, 10:25 AM   #3
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Default Re: O-rings for heater core?

Ok, well I guess I'll lube the pipes and try again. Thanks for the help!

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