ProJect Posted December 3, 2022 Report Share Posted December 3, 2022 (edited) Update: solved and documented removal with photos and notes here: https://imgur.com/a/yQTQwN7 https://imgur.com/a/Y7V8QfL Happy to give back to this amazing community, thanks again!!! Hey guys! Tried my best finding an answer on my own but couldn't find anything relative to the 1979-1983 720. Do I need to remove the entire dash to remove the heater core on this one? My manual is kind of incomplete on this section, doesn't really say. Trying to save myself the hassle if I don't need to fully disassemble the dash. Thanks in advance! Edited December 13, 2022 by ProJect Added update and pictures Quote Link to comment
datzenmike Posted December 3, 2022 Report Share Posted December 3, 2022 No need to remove the ash. Heater slide control ables can now be removed, even the one to the fan box. Disconnect the plastic bellows hose between heater and fan Drain the cooling system to below the heater and disconnect the two hoses from the heater core. Might be easier to warm the engine so they are soft. There's a stud on the left and right side of the heater in the fire wall close to the floor and heater is secured with nuts. There is a bolt at the top back. Just the three fasteners. Don't be surprised if I missed something. The heater box splits vertically through the middle and is held together by spring clips, don't lose them. 1 Quote Link to comment
Thomas Perkins Posted December 3, 2022 Report Share Posted December 3, 2022 (edited) Funny Mike,if the 82 is like the 85.You have to lift the right side of the dash to get the heater core out.I have replaced. 3 of them.Now they are obsolete.That is why I got a custom made heating and air.Could not find another one.I was getting them from Auto Zone and the last one I took out,they gave me my money back cause they said they no longer could get them.The guy,Jack could not find one either,and that was a blessing cause he installed a custom made one and all the junk Nissan stuff is in the land field.When you put a after market heater core in,it doesn't fit in the heater box right and causes problems.You have to start at the blower motor and work your way to the heater core.Then the seals will need replacing cause they will be dry rotted.The heater box and the a.c. box share the same stud,that is why the dash has to be lifted.I used a 2x4 to hold it up.No manual will tell you how to do it.All the heating and air switches have to be removed.You have to pretty much go in the same order as putting it back together.Guess what,never will have that issue again.It is a bitch,getting all the vents lined back up since the dash was lifted.See the green scrub pads i used to seal it.Here is a heater core I found one Ebay after Auto Zone gave me my money back and it was the exact same kind and only last a year or so.I still have the Nissan blower motor if anyone wants it.The heater box has the new heater core in itIt would not fit in the box good and caused problems when you adjusted the switches,The oem one's have the plastic elbows.Look at the date on the bottom pic.2014.If you look at the bottom pic you can see that rod is real close to the core pipe and it rubs on it when you turn the switch.And at times it does not work.Junk after market heater cores. Edited December 3, 2022 by Thomas Perkins 1 Quote Link to comment
datzenmike Posted December 3, 2022 Report Share Posted December 3, 2022 I think I had one laying around, maybe two. Guessing '83 and up. I think one had 4 fan speeds, I don't know what year that was. Quote Link to comment
Thomas Perkins Posted December 3, 2022 Report Share Posted December 3, 2022 (edited) Yeah Mike,I bought a new blower motor resister and they gave me the white one and mine uses the black one.So I still have it in the box.But I no longer use the blower motor that Nissan uses. Edited December 3, 2022 by Thomas Perkins Quote Link to comment
ProJect Posted December 5, 2022 Author Report Share Posted December 5, 2022 Fantastic info and thank you guys so much. Looks like I have a slightly different setup in my 82, from what I've read at least the blue and control module are different(my fan has 3 speeds, but the last one isn't working, not sure why). Got the rad drained, hoses disconnected, doing this all while replacing the water pump since everything's already drained. I'm going to go in there tomorrow after some of the snow out here clears up. I'll take some pictures while I do it for future 79-83'ers with the same question. Been kind of a wild ride because I had a bolt snap while pulling my old water pump. For future reference, should I spray some sort of penetrant onto bolts I pull or prepare them in some way? Seems bolts love to snap on this old girl. I can learn to replace parts all day long on you tube, but those little rule of thumb things your dad is supposed to teach you usually aren't included. My dang dad always called a mechanic 😞 Thanks again! I would be pretty freaking lost without y'all. Quote Link to comment
bottomwatcher Posted December 5, 2022 Report Share Posted December 5, 2022 I lost a fan speed due to a simple solder break. 2 minutes with a soldering gun all good. 1 Quote Link to comment
ProJect Posted December 13, 2022 Author Report Share Posted December 13, 2022 (edited) Alright guys, got everything taken apart and ready to pull the heater... except that one bolt in the back. Looks like it rests right behind the center ventilator duct T splitter thing. At this point do I need to pull the dash? Not sure how I'll get to that screw unless I just loosen the dash and shimmy it up? Anyway, here's pictures of my total progress: https://imgur.com/a/Y7V8QfL Part 2: https://imgur.com/a/yQTQwN7 And attached to this post is the diagram with the screw I can't get to(yet). Thanks again, guys! Edited December 13, 2022 by ProJect Added the complete removal pictures, thanks guys! Quote Link to comment
ProJect Posted December 13, 2022 Author Report Share Posted December 13, 2022 (edited) Alright, well I put on my big boy pants and unbolted the dash enough to lift it and got an articulating wrench in there. The dash was less of a PITA than I had imagined, but getting a wrench in was not easy. I updated my Imgur folder to site the complete removal for future users. With that done, I got it loose and out! Quick question: What kind of foam do I need to replace the weather stripping? Is it necessary to re-foam that whole flapper? Thanks again!!! Edited December 13, 2022 by ProJect Quote Link to comment
Thomas Perkins Posted December 14, 2022 Report Share Posted December 14, 2022 Yeah,all that sealant is dry rotted.Check my pictures,i have boxes of green scrub pads i used with 2 way tape,it was free even the tape and it worked,but I no longer have the Nissan heating and air.It sealed it. Quote Link to comment
ProJect Posted December 14, 2022 Author Report Share Posted December 14, 2022 Excellent solution! I think I have both of those things sitting around, if not the tape I have some good strong spray adhesive. Quote Link to comment
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