REMOVAL & INSTALLATION
- Remove the four bolts which retain the reservoir to the bracket behind the left headlights.
- Disconnect the vacuum hose from the reservoir and remove the reservoir.
- Connect the vacuum hose to the reservoir.
- Position the reservoir to the retaining bracket and install the four retaining bolts.
Headlight Covers Won't Open
- Turn on the headlight switch.
- Turn the by-pass valve to the parallel position and see if the covers open.
- If they do open, check the yellow and green hoses between the by-pass valve and the headlight switch for kinks or cracks.
- If the hoses are in good condition, replace the headlight switch.
- If the covers do not open when the by-pass valve is turned parallel, check the yellow and green hoses between the by-pass valve and the vacuum motor or motors for kinks or cracks.
- If the hoses are in good condition replace the by-pass valve.
On models not having a by-pass valve, check for a plugged venting hole on the headlight switch.
Headlight Covers Won't Close
- If the car contains a by-pass valve located between the headlight switch and the motor or motors, make sure it is in the normal position.
- Start the engine and check for vacuum at the orange hose that connects the intake manifold to the check valve.
- If there is no vacuum available, check the orange hose for leaks or kinks.
- If vacuum is available, turn off the headlight switch and leak test the white hose that connects the check valve to the headlight switch. Leak test it again with the switch on.
- Leak test the vacuum motor, headlight switch, and vacuum reservoir and replace if necessary.
- Check the yellow and green vacuum hoses, between each component, for kinks or leaks.
- Check for a plugged venting hole on the headlight switch.
Vacuum Test Probe
A vacuum probe tester cannot be obtained commercially, but can be made easily.
- Cut a length of 3 / 16 in. vacuum hose long enough to reach from the engine intake manifold to any part of the vacuum system.
- Insert a four-way connector into the working end of the hose.
- Attach a vacuum gauge to one of the four-way connector nipples.
- Install a short length of 3 / 16 in. hose, with an adjustable hose restrictor, onto another nipple of the four-way connector. An adjustable hose restrictor may be obtained from some automatic transmission tester kits.
- Install a short length of hose onto the last nipple of the four-way connector. Insert a tee connector into this hose.
- Install a short length of hose to the two open ends of the tee connector.
- Install a 3 / 16 - 1 / 8 in. reducer in one hose and a 3 / 16 in. splice connector in the other hose.
- By adding or removing connectors (splices) to these test probe hoses, they can be connected to any 3 / 16 - 1 / 8 in. hose, nipple, or connector, while the other test hose is plugged; or both the 3 / 16 and 1 / 8 in. tester probes can be used at the same time.
- To adjust the probe to the required 14 in. of test vacuum, plug the test probe hoses into the vacuum source at the carburetor.
- Adjust the hose restrictor until the vacuum gauge reads 14 in.
Headlight Cover Vacuum System Leak Test
- A leak test on any part or component of the headlight cover vacuum system can be done with the use of the vacuum test probe.
- Plug the probe into the system at the desired point.
- The reading on the gauge should momentarily fall below the preset valve of 14 in.
- If there are no leaks in the part being checked, the gauge reading should come back to 14 in. of vacuum and hold.
- If there is a leak in the part being checked, the gauge reading will not come up to 14 in. of vacuum.
Headlight Switch Leak Test
- Connect the vacuum test probe to the center (white) port of the headlight switch.
- Cap the two outside ports of the headlight switch.
- Move the switch selector thru the OFF-PARK-ON positions.
- The gauge should read 14 in. of vacuum in each position.
- If the gauge reading should fall off at any position, the switch should be replaced.
See Figures 1 and 2