You probably have a refridgerant leak. You can have it recharged, but it may just leak back out again after a few days or weeks. You need to have a pro service it.
Check the fluid.
temperature is cold red is hot
sounds like a transmission problem to me, clutch or g'box? dunno why it works when its hot, maybe the clutch slips more when its cold???
Cold is what I've found works best.
How to check valve clearance on 3E Toyota engine
An echo is expected to return more quickly on hot days compared to cold days, as sound travels faster in warmer air due to the air molecules moving more quickly and being less dense. The speed of sound typically increases with temperature, resulting in shorter echo return times.
heat rises and cool air sinks
The word is "spue," the King James-era spelling of "spew." The New King James translation renders it "vomit." The King James passage is: Revelation 3:15, 16 - I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth. From the New King James: I know your works, that you are neither cold nor hot. I could wish you were cold or hot. So then, because you are lukewarm, and neither cold nor hot, I will vomit you out of My mouth.
A hot and cold mixer valve works by combining hot and cold water streams to achieve the desired temperature. The valve has two separate inputs for hot and cold water, which are mixed together based on the position of the handle or knob. By adjusting the ratio of hot and cold water flow, the valve regulates the temperature of the water coming out of the faucet or shower.
It can, but hot water works better because it helps to dissolve grease and hardened food better than cold.
Hot usually works best, but try them both and use whichever one gives you the most comfort.
Because the engain is too cold, the engain works best when it's hot