Hey guys,

So I'm having a bit of trouble with my old EL Falcon. The other day I got a new GPS and decided to run the cable through the firewall to hide it away. The result was all good - or so I thought -I seem to have knocked something loose behind the firewall and I can no longer switch the heating/air conditioning to any setting other than blowing at my face. How can I fix this/how difficult would it be? I'm not particularly handy with cars, most complex thing I've done is installing a head unit.

Cheers for the help!

Chances are you've slipped a vac hose mate. Follow all your vac hoses

There are two Vac hoses coming out of the firewall - one to the engine, and one to the Heater Water Switch. Check both - they come out often enough.