Subienewbe Posted January 25 Share Posted January 25 Hopefully this helps someone else. I picked up a clean XT a couple months ago that was run out of oil and was knocking bad. It had a bunch of work done by the PO and he just wanted to stop the bleeding. I found an unmolested engine at Pick-N-Pull, pan was spotless and leakdown of 4% on all cylinders. So far it runs great but now that it's running there is no heat on the passenger side. I found the actuator not working and replaced it. Now with a functional actuator still no heat. I pulled the dash and now that I could look down into the HVAC box I could see the blend door intact. Reading that some have found a plugged heater core I hooked up a 5/8 heater hose to the garden hose and flushed both directions for quite some time but found just a slight improvement. I finally decided to pull the heater core and verify. Sure enough, running hot water into the core only the driver side of the core got warm, the passenger side cold. I cut it apart and sure enough plugged solid with a jelly like substance. Possible mixed coolant types or stop leak? 1 Link to comment Share on other sites More sharing options...
KZJonny Posted January 25 Share Posted January 25 Yikes! I too have heat to only the drivers side of my OBW, and this is not encouraging. Hah! I've done the rad flush, also with little success, and the next thing i had planned was to set up a pump and some sort of caustic to circulate through the heater core in hope of clearing it up a little. That does not look encouraging tho..... Would you guess it is a consistancy that any amount of chemical/ flushing action will have an effect? I really don't think it is worth my time to pull the dash on an 18 year old NA Subaru to fix the problem properly..... Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 25 Share Posted January 25 I have a brand new heater core ready to get installed. But I've been lazy to pull the dash.. Link to comment Share on other sites More sharing options...
Subienewbe Posted January 26 Author Share Posted January 26 8 hours ago, KZJonny said: Yikes! I too have heat to only the drivers side of my OBW, and this is not encouraging. Hah! I've done the rad flush, also with little success, and the next thing i had planned was to set up a pump and some sort of caustic to circulate through the heater core in hope of clearing it up a little. That does not look encouraging tho..... Would you guess it is a consistancy that any amount of chemical/ flushing action will have an effect? I really don't think it is worth my time to pull the dash on an 18 year old NA Subaru to fix the problem properly..... I'm not sure, but a buddy that works at a Dodge store said they made a setup with a bilge pump and they circulate concrete cleaner in a bucket or tote. He said you need to neutralize it so it must be caustic. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 26 Share Posted January 26 (edited) 14 hours ago, Subienewbe said: I'm not sure, but a buddy that works at a Dodge store said they made a setup with a bilge pump and they circulate concrete cleaner in a bucket or tote. He said you need to neutralize it so it must be caustic. mmh. I need to look into it. If there is a way to break down this green crap without removing the heater core, I am all for it! Edited January 26 by xt2005bonbon Link to comment Share on other sites More sharing options...
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