[Roadster]

Originally Posted by S.hafsmo

My climate control panel shows only 3 dashes (---) and does not respond to input, other than for fault code reading. Though no codes show. Fan blows constantly to windshield when ignition is on.

Having attempted some fixes (headunit eraser/cleaning and programmer capacitor replacement) without the desired success, I've started glancing for a replacement while the fault finding continues. I notice the Z programmet have a different part number, which naturally makes it 3-4 times as expensive. Why? Can I not use a programmer for a regular C4? Any hints on where to acquire one that does not cost $700?

I think I understand what you are saying, and if so, what you need to do is take out the Climate Control Panel and clean all of the contacts. The thread below I posted a year and a half ago on this procedure. I found the info on You Tube, and it works great. If you do this you may not have to purchase another unit....

http://www.zr1.net/forum/showthread.php?t=25372