[Donald E George]

Compressor high pressure outlet to condenser maybe? Definitely an A/C hose. The leakage you see there is compressor oil. If you have liquid there, you don't have A/C cowboy.:frown:

 

[Donald E George]

I believe the radiator top tank is sealed to radiator with an o-ring type gasket. Could be o-ring has lost resiliency letting coolant escape. New radiators aren't that costly. Use a DENSO.

 

[Donald E George]

Upon closer inspection, it looks like the top of the radiator is leaking. There is a line of pink crud around top of radiator. The pink fluid dropped to the fan and to the hoses. All hoses looked OK. I am going to rent radiator pressure tester from Autozone. As of now I believe the problem is the radiator.

My AC is running very cold and fine. In SoCAL, 100+ degree weather, my AC is pumping out super chilled air. I just had AC refrigerant refilled about 6K miles ago.

"super chilled air" being about 36F/40F. A/C evaporator temperature has to be maintained above 32F to prevent it from developing frost/ice. That is why the compressor cycles on and off, to prevent evaporator frost(or worse).

 

[Donald E George]

I changed out the radiator and 2 big hoses to the radiator. One tip I need to give out to get a few of the 2" screw hose clamps. The clamp from Toyota wouldn't fit over new hoses. I was able to reuse a few clamps but not everyone of them fit.
I had to remove battery, air intake inlet and the tube that connects between intake inlet and air filter box.

This video helped me.
https://www.youtube.com/watch?v=yrVQ38cSkqU&index=26&list=PLlTUEWrjg_WinKSq1WR9Omc-9iMh7345_&t=97s

Excellent presentation dia. You're the man.:thumbsup::thumbsup:

 

[Donald E George]

There is no pressure on the overflow hose so OEM doesn't use a clamp. I doubt if a clamp will solve the problem. Probably a crack in the top tank where hose connects to radiator.

 

[Donald E George]

Donald E George, you have been very helpful. I put permatex ultra grey sealant on overflow hose and the stub. It didn't stop the leak. I opened up the cap and the coolant gushed out. I didn't see any drop coming out of the cap but I believe the cap is causing the leak. It looks like the o-ring needs to be changed. Notice in my post #27, the thumbnail shows the cap can only fit sideways. I am not sure if the orientation makes a difference or not. I am going to change out the o-ring and see what happens.



Update: i couldn't find the o-ring at a good price. They cost more than the cap. I came across this:
https://www.ebay.com/itm/400740286231?ViewItem=&item=400740286231

Look at this with these 2 orings. I don't know where I would buy the replacements for these kinds of o-rings. This looks like it will stop the leak for sure.

Don't know what you are referring to when you say the cap will only fit "sideways." The radiator cap has two(2) seals. Look at it and you can see where it seals to the radiator. The top seal maintains the cooling system pressure(about 15psig) and the lower seal allows coolant expansion by lower seal opening and coolant flow to overflow tank. Cooling system cools to ambient which creates a partial vacuum and cap allows coolant to return to engine. Cap is a two way valve. Don't bother with anything but OEM caps. The one you are showing is garbage.