I purchased my 1993 Toyota from someone who modded a bunch of stuff in the engine, including putting in a header, taking out the Catalytic convertor, removing the A/C compressor and moving/rewelding different pipes (including the cooling system pipes).
Anyway, I’ve noticed that it’s heater has never worked, and I just figured I needed to replace the thermostat. In the stock engine, you need to drain the coolant system, and then remove the bottom radiator hose. I did that, and discovered that when he welded the new coolant pipes on, he failed to put in mounts for a thermostat, and there was no thermostat there. Is this fixable at all, or am I stuck without a thermostat (and heating in the winter?)