Greetings!
I am new to this community and I look forward for your help and advice.

I inherited a 1992 Honda Accord EX from my grandfather who unfortunately passed away in 2020. Since then his beloved Accord has been stored and the time has come to put it back on the road. The engine has been occasionally started and idled and driven in the garage during the past few years.

However it has developed a coolant leak at the thermostat housing. Upon further inspection, it is leaking at the metal coolant pipe at the thermostat housing. Please refer attached picture.
Any advice on how to remove that pipe to reseal or replace?
Many thanks in advance!

 

There are several heater core sized hoses and possible smaller vacuum hose sized hoses attached to the connection pipe.
To remove it you must remove those hoses and then the thermostat housing which bolts to the cylinder head. Note it is directly to the right of the red circle, the Lower Radiator Hose goes to it.
With the housing unbolted you should be able to wiggle the connecting pipe free. It is seated/sealed by O-rings at either end, use appropriate lubricant when installing the new O-rings.

Removal of the air intake, between throttle body and air cleaner housing, will give you room to see.
Inspect the pipe for damage/corrosion. Replace the various heater core hoses while you have it apart.

Upon refilling the coolant system, leave the engine OFF, turn the heater valve to full hot(this opens a mechanical water valve), there is a bleeder screw on the thermostat housing that needs to be left open to bleed the air out of the system. I'd suggest using clear hose to watch for air bubbles when filling the system. When it is solid with no more air bubbles the system is purged of air. Close the nipple and fill the radiator and expansion reservoir to full.

 

Apologies for not giving an update.
I followed your helpful instructions and managed to patch the leak. There was a small pin hole formed due to corrosion. I flushed the system and added the correct coolant.
I had trouble bleeding the clutch after replacing both the master and slave cylinders. I tried every bleeding method but I couldn’t get any pressure. I ultimately had to remove the new master and bench bleed it first and then reinstalled and after a couple of pumps it built pressure. Bled the system and she’s now drivable after 3 long years!
Up next is replacing all the vacuum lines from the carb…
Cheers!