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There's plent of places to lose coolant beside the head gasket. Check the heater valve on the firewall. Check for leaks from the small hoses under and around the intake manifold. Check for seepage or leaks at the radiator especially the header tank seams. The radiator cap can also be a problem. And of course the ultimate bad boys, the two 90 deg elbows on the pipe that runs under the exhaust manifold and the rubber cap on the pre-89s. Check for coolant in the foot well carpet and pray it is not the heater core, that is a serious pain to replace. If you have a coolant pressure tester hook it up and see how you do. If the system is maintaining pressure the radiator hoses should feel firm with the engine off and warm.

 

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I've used Toyota Long Life Red (concentrate) with great results. It was the factory fill in 1986-92 and is compatible with the brass and copper in the 7M and has phosphate for ferrous metal protection. The later premixed Toyota Super Long Life Pink (a HOAT coolant) would be a poor choice in a cooling system with any brass/copper. What issues did you have with red?

 

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That is the famous 90 degree bend hose. There is another at the front of the motor. Both get cooked by the exhaust and fail. Suggest replacing both. The heater hoses are also back there but are not that one.