1967 buick skylark diagram for vacuum hose - 1989 Buick Skylark

F.O. is 1-8-4-3-6-5-7-2. Rotor turns clockwise. Wire from coil to distributor is from negative side of coil. The positive side of coil is for hot wire originating from ignition switch. Always hot with key on.
For vacuum diagram, just google "1967 Buick Riviera 430 cu in, vacuum diagrams" . It is there.

If you lost a vacuum line then the heater would let hot air out the vents with or without the fan motor running. Do this test with the engine up to operating temperature Touch both hoses with the heater on and temp control to the hottest position. Now check the temperature of both hoses. They should be the same. If not that indicates a blockage of water to the heater core. Test the water flow valve too. It can be plugged with rust or not moving to let water into the core. The core itself can be plugged too. If you really need a hose diagram, a Chilton's manual will be your source of information. The engine won't idle well with a vacuum hose off.

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Here a diagram

You can check this website, you find there fuse box diagram and description for Buick Skylark

Skylark CARKNOWLEDGE

Rich condition on bank 1. Can be dirty MAF sensor, vacuum leak, fuel pressure problem. Inspect all vacuum hose and PCV hose. Clean the MAF sensor. Inspect fuel lines for pinches, leaks, or cracks. Replace the fuel filter. Purchase a can of quality fuel injector cleaner such as Seafoam or Techron and pour one can in a full tank of fuel. Check for exhaust leak before the O2 sensor. If none of this corrects the problem seek professional help.

Try Autozone's website. They have repair manuals online for free that usually include vacuum and wiring diagrams.

It does not hook to throttle body , it hooks to a vacumn port on the intake manifold. Follow hose from cruise control module to the tee-three-way connector on firewall. Over time the tee will fall apart and will leak One hose goes to the vacumn port, one to cruise module,one to ac contols.

Waited for engine to cool and checked all vacuum hoses and sensors, according to vacuum diagram and found a couple of dry rotted hoses. I replaced them and troubles went away.

Pull the panel under the glove box. You should be able to see the heater core. disconnect the two hoses under the hood on the firewall to the heater core. put a pan below to catch the antifreeze. Replace heater core. reconnect hoses.