Leaking Engine Coolant

[Viraf]

Greetings, I have a 1993 GS300 which runs great but I noticed that it is heating up.

I checked the T-stat its ok. Pressure tested the radiator and its good als.

Finally I found that there is a hose right at the back on the top very close to the firewall whose one side connects to the engine and the other side connects to the "Flush/Fill" connector which is then connected to a control mechanism which is regulated depending if the heater is running or the AC. This hose is easily visible on the top right part of the engine at the very back.

Fluid squirts out at the base where this hose connects to the engine. There is no clamp there, and am not sure how that hose fastens and how to replace this so the fluid will stop squirting out and the car not heat up. I don't want to just pull it out and find that I have created another problem.

I also noticed that the fluid squirts out when there is pressure caused when the accelerator is pressed high (so when car is running fast) and when the AC is turned on.

Any ideas or suggestions. Has someone else had this problem and could you share with me as to how this was fixed. I could take it to the shop but I am a fairly handy guy and have done a lot of work on the car myself so want to take a crack it it with some guidance. Thanks.

Viraf