Post: #1

Have a 87' 780 that has the automatic heater controls but would rather have the regular three knob set up. Is it hard to change this or would I have to rip the whole dash apart to switch over? Can I just change the controls or is the rest totally different?

Post: #2

Helped a friend do this conversion on his '86 764T. Went from the single dial-a-temp automagic temp system to the normal 740 HVAC controls. It required changing the entire HVAC box under the dash; there were too many little differences with diaphragms, linkages, duct routing, etc. We hoped for a control head swap and go, but it was way more involved.

Not trying to scare you off, it's a very worthwhile conversion. Just saying from experience to grab everything you can think of from a donor car first. At the very least grab the complete HVAC box, control head, and everything that goes between the control head and said box.

Post: #3

^ That

All 780s should have the 3 knob auto setup like this though, which is basically what you're asking for? Or do you want to get rid of the auto capabilities?

Post: #4

Yes want to get rid of the auto controls if I keep the car but most likely will sell it. It works but A/C not woking. It has the prv in it too.

Post: #5

If it works why dick with it? A/C work is easier than college girls with the right equipment