Alternator straining to maintain battery charge?
It may not be the fan making "more" noise when you turn on the lights. It may actually be the bulbs making noise. Incandescent bulbs when operating on a dimmer make a high pitched noise - it is the filament vibrating. Try just the lights without the fan and see if you hear anything.
The ticking noise is the metal cooling.
lights are on
Engine choke and make noise if the Engine Oil is low. of if you got bad gas...
There are quite a few relays and solenoids that are activated when an engine is turned on. Some of them make noise.
The A/C system compressor operates when in the defrost mode. If the noise is also heard when running the A?C it is more than likely a problem with the compressor/pulley.
Probably answered by this service bulletin: TT0404-004 APR 04 Body - Whistle from Engine Area
Noise. Without noise, it can't work. Noise is in an engine, and without it does not work. Every engine has to make some kind of noise, internal or external, inside or outside the engine.
To design a circuit so that lights can be turned on and off separately, we connect the circuit in parallel.
I just had that problem on my 2000 Acura 3.2 TL. I needed to replace the belt tensioner.
You might need to replace the automatic belt tensioner.
I had a similar problem in a taurus. I had to replace the alternator.