Ac Fan Working Logic?

[YangLIU]

Hi all,

does anyone know AC fan (not big thermo fan behind radiator) working logic? i fitted universal thin AC fan last week, i found it will not work all the time.

if my car is hot (ie. 96°C) then start engine, AC fan will start working until water temp drop down. after that, if the car is hot again (ie. back to 96°C), the AC fan will not work.

it is 37°C today in SYD.....i am thinking to wire AC fan to battery with relay to make it work all the day to avoid overheating.

[Dose Pipe Sutututu]

Because it's not an AC fan.. it's an overheat fan triggered by the thermostatic switch mounted in your radiator.

The reason behind this is that in Japan the AC is used more so as dehumidifier in their cold season and there's no need to cool down the condenser at all and by kicking off an A/C fan it would over cool the radiator and thus the motor.

In Australia it's hot as fuuuark, thus majority of cars delivered or manufactured here will engage a condenser fan when the A/C kicks in to cool shit down.

A trick is to get a diode and connect the A/C trigger to the Overheat fan trigger (relays I am talking here), so when you turn on your A/C the fan will kick in but when your fan goes on without the A/C the A/C compressor won't kick in (thank the diode).

Hope that explains it

[YangLIU]

yes, totally agree. currently i am using walbro fuel pump with a relay for constantly 14v, i just connect the small fan to that relay (it means when turn on engine, the small fan will kick off)

will see the result later and keep post on