New to this forum,
I have a 1990 subaru legacy 2.2l 5-speed and having an overheating issue. list of things i have done since owning car. Transmission, suspension, brakes, wheel bearings, clutch, flywheel, timing belt, water pump, thermostat, alternator, battery, radiator, head gasket. After replacing the head gaskets still running into overheating problems can drive around 20 miles. shortly after the check engine light comes on and most or all of the coolant goes into the overflow reservoir and straight to the ground. Here are my thoughts and ideas.
1: Water pump somehow working incorrectly (not likely)
2: New radiator plugged up (not likely)
3: Thermostat bad (possible)
4: Heater core is original possibly clogged (very possible)
1: have replaced everything but heater core, coolant temperature switch, relays for cooling system. What else could it possibly be?
2: should i bypass the heater core and see if this revolves the issue?
3: is there anything that im missing that i should do to source the problem such as; pressure test cooling system, replace the thermostat or do a (pan test) to insure proper closing and opening?
Please help so frustrating lost and not sure what to do next any comments and or ideas will be greatly appreciated.