The ventilation fan for heat/ac is not working. The fuses all seem the be ok. Any thing else to look for

Some cars feed the high speed on dash fans thru the ignition switch. So it will only work at low speed for heat and AC..

there are two fans, one comes on with the air con, the other when operation temp is reached . check fan fuse and censer if ok check fan motor.

check the fan itself to see if it works. check the heater fuse first! if all is ok, you probably have a bad heater fan resistor. to check blower, please go here on pc for info on blower. .cargurus.com/Cars/Discussion-t16272_ds569146

As both the radio and ventilation motor packed up simultaneously, I suspect a common 12V positive feed, so if fuses ARE ok, then try unclip fuse box as far as possible to look for a burnt off / broken terminal. As you said p-locks & p-windows didn't work before, there might be loose connections hidden away under dashboard, behind console (center).
Happy hunting!! :)
Clive.

Your friend is right. To answer your other question these are two totally seperate fans but that does not mean that one fans fuse or relay did not affect the other. You should check your fuses and which ones, if any, are blown. It is likely that during your radio installation a bare contact touched something and blew the fuse(s). If the fuse is blown and, when you replace it and work your heater fan, it blows again then chances are your radio may have cut a wire upon sliding it in. Reply back to this post and let me know.

turn on ac if the fan comes on the you have a bad fan to be sure use a test lightto check for power at the plug.

check blowere motor resistor on or next to motor on passanger side

First thing I would do is check your fuses. If all of your fuses are intact, I would make the assumption that it must be the control assembly itself (your actual dash control unit) since to my knowledge it is the only point where the two exclusive systems (heating and AC) are integrated with each other, aside from sharing the duct and to some extent, the electrical system. Being that neither the heating NOR cooling system will work, it seems the only common denominator.

If you have blown fuse(s), remember that fuses almost never blow for no reason (wierd things DO happen on occasion!), and this is usually just a symptom of a deeper issue, such as a short or fault in your electrical system such as your fans, or other components, drawing too much current. Locked fan rotors will blow fuses, for example. Having to replace the fuse again in short order would indeed indicate the need to troubleshoot further.

Good luck!

Hi,
can you listen the ventilation fan working?
check fuse/ventilation fan engine

my 06 h3 just had same problem, the motor control resistor pack was bad, located under glove box, mounted inside ac duct, large connector and two screws will remove it.
mine had burnt spot on connector,cleaned connector terminals and installed new pack, works fine now. I found your problem while looking for another elec problem i'm having.