1972 Duster Build with my Daughter
AC Controls.... This is a '73 AC Box and control so it has the slide controls. This one is in very good shape...
This one is the main AC control. The nipples go to the vacuum actuators on the AC box and to the vacuum canister under the hood for a vacuum supply.
This valve is activated when the temperature is all the way to cold. It allows vacuum to go to the coolant shut off valve under the hood.
The fan speed switch was sticky and history with the Coronet says you have to pull this apart and clean it.
Easy just bend the tabs and the circuit board pops out. These are SIMPLE switches.
Check the continuity from the single tab on the right to the other two on the left. The three positions are open, shorted to one on the left, shorted to both on the left. The same argument for harnesses goes for these switches. The rivet connections that connect the spade connectors on were NEVER made to last 50 years. This switch was actually in good condition so I did not do anything else but clean and lube it.
The main switch is a different story. The steel rivets in the two brass spade connectors was corroded and the continuity was all over the map with the ohm meter. Need to pull it apart. Also the plastic melt pins are brittle. This design is not bad but the push button design of the previous years will push the back plate right off the switch eventually as those pins break. Use a razor blade to cut the heads off then disassemble. Once apart cut the pins flush. We will be drilling and tapping them for miniature screws later.
Interesting design. The contacts are like points with the bumps on the slider block closing them as you move the lever.
AC Controls.... This is a '73 AC Box and control so it has the slide controls. This one is in very good shape...
This one is the main AC control. The nipples go to the vacuum actuators on the AC box and to the vacuum canister under the hood for a vacuum supply.
This valve is activated when the temperature is all the way to cold. It allows vacuum to go to the coolant shut off valve under the hood.
The fan speed switch was sticky and history with the Coronet says you have to pull this apart and clean it.
Easy just bend the tabs and the circuit board pops out. These are SIMPLE switches.
Check the continuity from the single tab on the right to the other two on the left. The three positions are open, shorted to one on the left, shorted to both on the left. The same argument for harnesses goes for these switches. The rivet connections that connect the spade connectors on were NEVER made to last 50 years. This switch was actually in good condition so I did not do anything else but clean and lube it.
The main switch is a different story. The steel rivets in the two brass spade connectors was corroded and the continuity was all over the map with the ohm meter. Need to pull it apart. Also the plastic melt pins are brittle. This design is not bad but the push button design of the previous years will push the back plate right off the switch eventually as those pins break. Use a razor blade to cut the heads off then disassemble. Once apart cut the pins flush. We will be drilling and tapping them for miniature screws later.
Interesting design. The contacts are like points with the bumps on the slider block closing them as you move the lever.