Where is the fuse box in a Toyota Solara 2004

Sounds more like a blend air door problem than a fuse. Fuses are in the power distribution box.

I don't knw why you're going for electrical. When the blower works but you have no heat, thee problems could be that engine coolant is too low to get to the heater core, the Mode Door isn't working properly, the engine water pump is malfunctioning, or there's an obstruction in the supply of heated coolant, like an air bubble in the line.

Toyota's mechanics have examined the car and they concluded that the DAMPER SERVO SUB-ASSEMBLY (for RECIRCULATION0 has to be replaced. Do you agree? Could you send me a schematic showing where this part is located. I get the impression that it is located between the engine block and the radiator. So, this is a big job of about 5 hours.

They are just using fancy words to mess with you. but yes the problem is part of the heater box assembly and to get to it they have to remove most of the dash, on some makes this can be well over 1000 bucks for repairs (personal experience there) so that price seems fair.

thanks, but I understand that the DAMPER SERVO SUB-ASSEMBLY (for RECIRCULATION) is located between the engine block and the radiator. So, if there is no heat blowing into the car, is the replacement of this part a possible fix to get warm aair.

No it's in the heater box.