How do you adjust the heater temperature control cable on a Mustang or Cougar?

Remove the glove box liner, loosen the temperature control cable clamp, move the temperature control to within 1/8 inch of the high heat position, move the blend air door to the heat position and tighten the cable retaining clamp, then reinstall the glove box liner.

How much preload should the A/C vacuum actuator return springs have?

The single acting actuators are adjusted so the return springs are preloaded for about 1/8 inch travel of the actuator connecting link with no vacuum applied. The actuator is moved until the preload indicator is flush with the motor body.

How is the water valve vacuum switch adjusted?

Loosen the switch adjusting nuts, rotate the cam plate to the maximum counterclockwise position, position the switch so the plunger is depressed 1/16 to 3/32 inch by the cam plate, then tighten the adjusting nuts.

What size pin is used to adjust the cam plate and mounting bracket on Falcon, Fairlane, and Montego?

A 1/8-inch pin is inserted in the locating hole in the cam plate and down into the hole in the mounting plate bushing; the cam plate and bracket are then rotated clockwise until the temperature door touches the evaporator wall firmly.

What components are labeled in Fig. 18?

Fig. 18 shows the temperature door control cable bracket assembly with the locating hole, adjusting nuts, roll pin, cam plate, black and blue hose connections, A/C heat door vacuum motor, water valve vacuum switch, and bushing.

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1968 Ford A/C Vacuum Actuator & Temp Door Cable Adjustment - Cougar, Mustang

Ford air conditioning Part 16-2: temperature door control cable bracket and water valve vacuum switch adjustment

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A/C service procedure (Falcon/Fairlane/Montego, Mustang/Cougar): temperature-door control cable bracket adjustment to 1/8 in bounce and water valve vacuum switch adjustment, with cam-plate diagram.

AI caption February 2018 · Photo 43 of 67

This is page 16-31 from a Ford factory shop manual, Part 16-2 (Air Conditioning), covering vacuum actuator and temperature door adjustment procedures. It describes adjusting single-acting vacuum actuators so return springs are preloaded for about 1/8 inch of travel with no vacuum applied. The main section covers the Temperature Door Control Cable Bracket Assembly Adjustment for Falcon, Fairlane, and Montego, with step-by-step procedures for the cam plate and mounting bracket (using a 1/8-inch pin in the cam plate locating hole) and the water valve vacuum switch (plunger depressed 1/16 to 3/32 inch by the cam plate). Fig. 18 illustrates the assembly, labeling the locating hole, adjusting nuts, roll pin, cam plate, A/C heat door vacuum motor, water valve vacuum switch, bushing, and black and blue vacuum hose connections. A separate section gives the Heater Temperature Control Cable Adjustment for Mustang and Cougar: remove the glove box liner, loosen the cable clamp, set the control within 1/8 inch of high heat, move the blend air door to heat, tighten the clamp, and reinstall the liner. The bottom of the page begins Section 4, Removal and Installation (evaporator housing), which is cut off.

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Frequently asked questions

How do you adjust the heater temperature control cable on a Mustang or Cougar?: Remove the glove box liner, loosen the temperature control cable clamp, move the temperature control to within 1/8 inch of the high heat position, move the blend air door to the heat position and tighten the cable retaining clamp, then reinstall the glove box liner.
How much preload should the A/C vacuum actuator return springs have?: The single acting actuators are adjusted so the return springs are preloaded for about 1/8 inch travel of the actuator connecting link with no vacuum applied. The actuator is moved until the preload indicator is flush with the motor body.
How is the water valve vacuum switch adjusted?: Loosen the switch adjusting nuts, rotate the cam plate to the maximum counterclockwise position, position the switch so the plunger is depressed 1/16 to 3/32 inch by the cam plate, then tighten the adjusting nuts.
What size pin is used to adjust the cam plate and mounting bracket on Falcon, Fairlane, and Montego?: A 1/8-inch pin is inserted in the locating hole in the cam plate and down into the hole in the mounting plate bushing; the cam plate and bracket are then rotated clockwise until the temperature door touches the evaporator wall firmly.
What components are labeled in Fig. 18?: Fig. 18 shows the temperature door control cable bracket assembly with the locating hole, adjusting nuts, roll pin, cam plate, black and blue hose connections, A/C heat door vacuum motor, water valve vacuum switch, and bushing.