Since it's a second vehicle and I don't use it much, I don't really want to spend money on a diagnosis and have been trying to research how I could diagnose (and maybe fix) the problem myself.
https://www.toyotaofeasley.com/air-conditioning-isnt-cold/ says:
1. A refrigerant leak
If the air still isn't cold after adding more Freon then there is probably another leak in the system.
- A bad compressor
There will usually be a loud noise when you attempt to turn on your air conditioner if the compressor is broken.
3. A clogged orifice tube
The orifice tube is located between the condenser in the front of the radiator and the evaporator in the passenger compartment. If there is an obstruction in the tube, it will stop the refrigerant from reaching the evaporator, causing your system to blow warm air.
4. It loses its charge
A very common cause of an air conditioner not being cold is that the refrigerant needs to be recharged. You can charge it yourself with a charger kit, but you may be more comfortable bringing it to the shop for an easy fix.
- The fan is damaged
You can recognize this symptom if you can feel cold air but it is not actually blowing.
Blend Air Door is jammed
Dirt inside the system
Moisture in the air conditioning system
I would guess my problem is #1, 3, or 4.
Do you have any more detailed tips about how I could narrow it down? What should I inspect?
