banzai510(hainz) Posted August 12, 2022 Report Share Posted August 12, 2022 (edited) Since I got 2 toyotas for cheap I been using them the last year and half and put the Datsun in the garage. The toyotas are great rigs and I love them , Nice more modern vehicles that stop start quiet when driving but no attention So I pulled my 510 and 521 out,I been using my 521 last month or so People love them wave as How much for sale ect.. I get home yesterday and notice massive amount of water in the cab. The Heater core has been leaky the last 10yrs or so but not enough to warrant anything major. But last night it I looked into it and the inlet/outlets must have cracked casue when I tried to get the hose off it was turning. then just snapped. so I took it apart and said no wonder the heater was weak all the pin needle in there. I had 2 spare heater core from Ted in Olympia,Wa and I said fuck which one is good? So i pour hot water in there till full and let them sit and picked the one that wasnt leaky. Does anybody make new ones that can get basic measurement to make chinese clones or something? I will install tonite and hope this dont leak. The heater valve in this one is broke and stuck but lucky is on the Open Mode where water will flow into the core. Edited August 12, 2022 by banzai510(hainz) Quote Link to comment
datzenmike Posted August 12, 2022 Report Share Posted August 12, 2022 Looks about right. My '71 was similar. Problem is the core is only as large as the palm of your hand and heating a 521 cab is a challenge. Fan is also pathetic for defrost. Quote Link to comment
Stoffregen Motorsports Posted August 13, 2022 Report Share Posted August 13, 2022 Bring it to your local radiator shop and see if they can make one for you. Quote Link to comment
banzai510(hainz) Posted August 13, 2022 Author Report Share Posted August 13, 2022 I got the other used one installed. The valve is stuck on OPEN which I was lucky man I have to tell you it was like a totally different heater once the pine needle were cleaned out. I cant wait for it to get cold!!!!!!!!!!! 1 Quote Link to comment
thisismatt Posted August 14, 2022 Report Share Posted August 14, 2022 Why not fix the valve while you had it apart? 1 Quote Link to comment
bilzbobaggins Posted August 14, 2022 Report Share Posted August 14, 2022 Fuck being stuck open, mine is......so much more heat here. 1 Quote Link to comment
Crashtd420 Posted August 14, 2022 Report Share Posted August 14, 2022 I think the biggest problem with the 521 heat is the connection to the fresh air .... the heater box has no recirculation ability so your constantly trying to heat the colder outside air, if you have one of those boots still.. Last year I bought one of the heater boots and I have debated removing it ever since.... I had better heat without it ... 1 Quote Link to comment
banzai510(hainz) Posted August 14, 2022 Author Report Share Posted August 14, 2022 20 hours ago, thisismatt said: Why not fix the valve while you had it apart? I wanted it to run now as I havent driven the truck for a year or so. I wanted to get my time driving it before the winter rains come. I dont want to attemp to change and actually makle it worse. the other heater core was actaully leaking from multiple areas and also the valve. anyway I leave all my heater boxes on the ON open valve position to keep waer and tear on them to a minimun my 510s and my 521. The 521 vent and the shut off vent actaully keeps the heat out of the cab. make a clone w/o the valve if this ever goes bad again but drove it all day to day and seems it will last a while Quote Link to comment
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