Heater switch problem

Back in April or so I bought my 77 Caprice. When I bought it, the heater/fan/defrost and all that worked just fine. Then I took apart the dash and put everything back how it was and never touched the heater controls and was careful not to move it too much. Well I put everything back to how it was and went to use the heater and defrost to see if it worked and it didnt. I could feel heat trickling out of there but the fan wasnt blowing. Then a few weeks ago my friend was messing around with it and randomly got the fan to start blowing. Is there something I should look for thats loose maybe? Or how should I go about fixing this? Any help would be greatly appreciated.

The switch probably needs replacing. Not the motor switch, but the heater switch (the slider on top). These have a plastic clip in them that tends to break, and when they do - you lose most everything.

The switch probably needs replacing. Not the motor switch, but the heater switch (the slider on top). These have a plastic clip in them that tends to break, and when they do - you lose most everything.

Are you talking about the one thats inside the car above the radio? If so are they easy to find?

Are you talking about the one thats inside the car above the radio? If so are they easy to find?

Yes and yes. It was a very common part - yours will interchange with mine and vice versa. Used on LOTS of GM cars from the 70s into the 90s.

When the plastic clip broke on mine, I put it back together with a locknutted bolt instead. It's a trick to get the three springs inside lined up properly, though.

Yes and yes. It was a very common part - yours will interchange with mine and vice versa. Used on LOTS of GM cars from the 70s into the 90s.

When the plastic clip broke on mine, I put it back together with a locknutted bolt instead. It's a trick to get the three springs inside lined up properly, though.

Alright then, thanks for the help!