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Old Jul 7, 2020 | 03:16 PM
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GraphiteGhost
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Joined: Jul 2009
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From: Central South Carolina
Default Re: Heater core replacement

Originally Posted by bnelson1970
Thank you for the help both George and ala_Xfire. Okay. Now I know I'm pushing my luck but I want to make sure that I understand. There are two nearly perpendicular hoses that go into the firewall and then into the Heater Coil. They are located in front of the silver engine heat shield and 1/2 a foot under the O2 sensor directly above (passenger side). Are you suggesting (George) that if I clamp both of these perpendicular hoses, that these are both the supply and return and this will be a somewhat legal bypass for now? OR that it will just go back around and come in on the other side?? I'm trying guys and I definitely don't want to hurt my engine.

thx again. what am I missing??

hey...if I can get around NOT doing the coil right now and still get the engine up and running and not hurt anything then I'd much rather do that as opposed to tackling something that will cause me to make up swear words...

thx,
Brian


Brian, those two hoses are the two ZONES (passenger and driver). The other line is on the firewall closer to the drivers side (if I remember correctly). If I am not mistaken, the SUPPLY line is the single line near the center on the drivers side and the two returns are the hoses on the passenger side. The duovalve controls the throttling on the two return sides (zones). The rest pump is forward of the duovalves below the passenger side headlight assembly (on the LHD cars). You should download the online service manual, look up the heating system piping, and use that while you do the repair (section 24, @ page 65 titled HEATER SYSTEM in my 2008 service manual). Good luck!


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