AU Fairmont Radiator fan won't stop + no heat from heater

[Bulandgoose]

I've been reading up on this thread http://www.fordforums.com.au/showthread.php?t=11319441
about the interior heater/demister fan not stopping. That sounds very promising and I'll have a look at that this weekend. However I need more help.

My story is as follows:
I've actually been given quite nice a 2000 model Fairmont by my brother-in-law for free, if I wanted to re-register and insure it, just so long as he could use to tow his trailer occasionally. They basically said it was a complete dog, but I might get a few miles out of it.

Actually, I think they fixed all its major issues before they got tired of it! (Well last one was the window switches, but I've fixed all those now)

Anyway, about 5 years ago, my sister-in-law came to me and said it was making a funny noise, even with the ignition off. Turned out the electric fan in front of the A/C evaporator was running all the time, so as an "emergency" fix I wired up a relay in series with the fan, so it would only run when the ignition was on. It's still wired up that way....

The other symptoms are
1. The heater/demister fan will only run at full speed, all other settings it just doesn't run at all. You can hear a relay click in when it goes top speed, so it's quite possible I have an open-circuit transistor instread of a short. I'll know more this Saturday.

2. The A/C works and all the various air redirecting thingies also work, but you can't get any heat, so it seems like whatever the thing is that lets the hot water through is not working. I've heard that on Commodores this can be caused by a faulty vacuum line, but I can't really make sense of what's under my hood.

Other that that, the car runs superbly so it would be fantastic if I could get this sorted out. "Of course, the Cruise Control is useless" sis-in-law loftily declared. Ah yes, but you have to turn it on first, dear! (The word "cruise" was worn off the indicator stalk and she don't believe in RTFM apparently....)

Also, can anybody tell me how you get the CD-Radio out? (Dead CD player, par for the course, but I'm hoping I can rig up a line input).

Thanks in advance for any advice, This forum is just what I was looking for