Radiator fluid loss

Burnt orange color at tailpipe. My guess is that the radiator fluid is being sipped through the head gasket. The car is a 1991 Honda Civic Hatchback Standard model with 4 speed manual transmission.

If your losing coolant, you have a leak. If you see evidence of it going out the tail pipe, it is internal to the engine. Head gasket, intake manifold leaks, or cracks/voids in the head are all suspect.

A mechanic can test for traces of combustion gasses in the coolant, and compression leak-down in the cylinders. Don’t guess about a leaking head gasket. Make sure, one way or the other.