SUPER_YOCOM Posted October 18, 2017 Report Share Posted October 18, 2017 Thanks in advance. I need to know which is the in and the out of the inlet/outlets?Ill be doing a core flush soon,Just maybe I will have heat. 84 Nap z.Is the top in or out please? Thanks Yocom 1 Quote Link to comment
datzenmike Posted October 18, 2017 Report Share Posted October 18, 2017 It really doesn't matter that much, like asking if a sandwich tastes better upside down. On the engine side of the firewall the hot water from the block is the bottom hose, the top one goes to the intake and eventually to the lower rad hose inlet to the water pump. 1 Quote Link to comment
MikeRL411 Posted October 18, 2017 Report Share Posted October 18, 2017 For CYA in case of future heater core leakage the inlet should go the heater ON OFF valve side. That's the only be careful step. 1 Quote Link to comment
datzenmike Posted October 18, 2017 Report Share Posted October 18, 2017 You would need two shut off valves to isolate the heater if there was a leak. Water would still be supplied from the lower rad return side. When the engine is hot there is always some pressure in the cooling system I would assume the stock set up is hot side to the valve but it will still give heat flowing in reverse.. 1 Quote Link to comment
SUPER_YOCOM Posted October 19, 2017 Author Report Share Posted October 19, 2017 Thank you,both Mike`s 1 Quote Link to comment
millican Posted November 14, 2017 Report Share Posted November 14, 2017 Well dang. When my heater core started leaking, I just connected the two hoses that went to it together. They're still like that. I figured if I could do without heat in upstate NY, I could here on the Mississippi Gulf Coast. And yes, the Datsun was driven here from NY (in March). I've had no luck finding a heater core. 1 Quote Link to comment
datzenmike Posted November 14, 2017 Report Share Posted November 14, 2017 You're ok for the winter but come spring either fix that heater or plug those heater hoses.Normally when it gets hot out and the heater is shut off the valve remains closed and no hot water is moving. When you connect them together the hot water from the head is recycled without cooling it right back into the engine again. If you compare the heater hose to the top rad hose about 20% of your hot water is not being cooled at all. This put a big load on the rest of the cooling system. 1 Quote Link to comment
millican Posted November 15, 2017 Report Share Posted November 15, 2017 That's a good tip. I did notice that it lost some cooling ability like that. Having a defroster is one thing I miss. 1 Quote Link to comment
DrvnDrvr Posted November 15, 2017 Report Share Posted November 15, 2017 https://www.ebay.com/itm/Ready-Aire-9382-HVAC-Heater-Core-For-Datsun-Nissan-80-83-620-Pickup-720/182690496406?fits=Make%3ANissan%7CModel%3A720&epid=79189232&hash=item2a8933bf96:g:PvsAAOSwCOpZezh8&vxp=mtr 1 Quote Link to comment
millican Posted November 15, 2017 Report Share Posted November 15, 2017 damn. and I checked on ebay for stuff just a day or so ago. I need to use more effective search terms. Thanks man! 1 Quote Link to comment
Crashtd420 Posted November 16, 2017 Report Share Posted November 16, 2017 Just Make sure the pic matches what you want... I've gotten screwed with not visually checking parts and just ordering because they say it's for a certain vehicle.... Not only eBay but rockauto and even the parts stores.... 1 Quote Link to comment
captain720 Posted November 17, 2017 Report Share Posted November 17, 2017 Just Make sure the pic matches what you want... I've gotten screwed with not visually checking parts and just ordering because they say it's for a certain vehicle.... Not only eBay but rockauto and especially the parts stores.... Quote Link to comment
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