Perhaps low on refrigerant or control cable not adjusted properly
The Toyota Camry block heater is located on the front of the engine block. You can follow the block heater cord to the block heater.
The 2007 Toyota Camry heater fan fuse can be found in the fuse box. The heater fan fuse will be at the bottom of the first column.
because the 2007 camry is WEAK!
A Toyota Camry is a compact car, although they do have a few different models that are a little bigger. They have great gas mileage, and are a very high end car.
To install a new heater core in a 1991 Camry, the passenger side dash has to be removed. After access is gained to the heater core, the old one needs to be taken out and a new one put in, replacing all of the wires and hoses.
how to fix 92 camary heater core
Under the glove compartment
There is a cover plate on the front bank of the six that could possibly be the mount for a block heater. I am not aware that Toyota offers a block heater. Maybe.
Sounds like your heater core needs to be replaced.
If they disconnected the heater core, it means it was leaking. Get a manual on your car from the parts store and it will show you how to replace the heater core also
heater core
It's obvious that you have problems with wiring. I would start from the heater/AC control panel.