I'm restoring my air conditioning and heater boxes and I have a mystery to solve.
I've located schematics for 66 and 67 AC and I understand the schematics pretty well.
Attachment 1714801191
They both show something called a "Air Conditioning and Heater Resistor Bypass Switch". The purpose seems to be increase the fan speed when set to Max AC. But these schematics do not show where this switch is physically located.
I have three different heater boxes from parts cars and one of them has a bypass switch which is tripped by the movement of the fresh air/recirculate door. It looks like this:
Attachment 1714801184
The other two heater boxes do not have this switch. Unfortunately I don't remember which heater box came off my car.
I have a similar switch on my air conditioner plenum which is tripped by the movement of the door that controls whether air goes through the evaporator or down to the heater/defroster outlets. It looks like this:
Attachment 1714801185
The 1965 Factory Service Manual I have does not cover factory air for Darts. I guess it was too new to make it into the manual.
The 1966 Factory Service Manual I downloaded contains the following passage:
Attachment 1714801186
So based on the 66 FSM, I'd say the bypass switch should be the one on the heater box that is switched by the movement of the fresh air/recirculate doors shown in the first picture.
But I'm trying to understand the other switch shown in the second picture. I'm thinking perhaps the design changed in 1966 and that perhaps the earlier 1965 design had the switch in a different location. But if that were the case, the blower speed would be boosted any time the air conditioning is on, be it Max AC or AC. Does that make sense?
Does anybody have a 1965 with AC that could tell me where the bypass switch is located? I know that's a tall order since both switches are hard to see when the system is installed behind the dash.
Also does anyone know if there is a separate manual which covers 1965 A-Body Air Conditioning?
I've located schematics for 66 and 67 AC and I understand the schematics pretty well.
Attachment 1714801191
They both show something called a "Air Conditioning and Heater Resistor Bypass Switch". The purpose seems to be increase the fan speed when set to Max AC. But these schematics do not show where this switch is physically located.
I have three different heater boxes from parts cars and one of them has a bypass switch which is tripped by the movement of the fresh air/recirculate door. It looks like this:
Attachment 1714801184
The other two heater boxes do not have this switch. Unfortunately I don't remember which heater box came off my car.
I have a similar switch on my air conditioner plenum which is tripped by the movement of the door that controls whether air goes through the evaporator or down to the heater/defroster outlets. It looks like this:
Attachment 1714801185
The 1965 Factory Service Manual I have does not cover factory air for Darts. I guess it was too new to make it into the manual.
The 1966 Factory Service Manual I downloaded contains the following passage:
BY-PASS SwitchIt also contains this table:
The by-pass switch increases the blower speed
when the “Max A/C” or “Fresh Cool” button is pushed.
Attachment 1714801186
So based on the 66 FSM, I'd say the bypass switch should be the one on the heater box that is switched by the movement of the fresh air/recirculate doors shown in the first picture.
But I'm trying to understand the other switch shown in the second picture. I'm thinking perhaps the design changed in 1966 and that perhaps the earlier 1965 design had the switch in a different location. But if that were the case, the blower speed would be boosted any time the air conditioning is on, be it Max AC or AC. Does that make sense?
Does anybody have a 1965 with AC that could tell me where the bypass switch is located? I know that's a tall order since both switches are hard to see when the system is installed behind the dash.
Also does anyone know if there is a separate manual which covers 1965 A-Body Air Conditioning?
