PDA

View Full Version : AC Problem need some help



A4_luke
07-24-2010, 01:16 PM
hey guys i got a 99 Audi a4 1.8t quattro

I'm having issues with my ac. The ac blows cold air but the ac fan does not spin. i am just wondering if the ac fan has a bad motor and how would i go about check this and replacing it

thanks

MattzWarsteiner
07-24-2010, 01:31 PM
If the thing blows cold air, I'm guessing the cabin fan works and you're asking about the cooling fan by the radiator?

There's a relay and fuse you can check. The AC control head sends the command to the relay to switch the fan on. The same fan can also be switched on high when the engine is hot and you are at a stop. It may take around a minute or more for this to happen and is done by the coolant temp sensor next to the bottom radiator hose outlet.

If it runs with a hot engine...temp at least at halfway mark on dash gauge...car not moving, chances are the fan is okay and there is something wrong with the relay.

MattzWarsteiner
07-24-2010, 01:43 PM
Previous thread on troubleshooting cooling fan
http://www.audizine.com/forum/showthread.php/230505-AC-problem..-need-help!

DIY on using AC control head to diagnose AC issues
http://www.audiworld.com/tech/int6.shtml