That's true. I thin that most people expect the owners manual to have information like how to adjust the radio and the seats. I've been trying to find out for some time what fluid is traveling through the factory oil cooler and no one has answered this for me. I know that the oil cooler connects to the radiator heat exchanger but is the fluid Oil or is it Antifreeze?

Those Vacuum and Electrical manuals would be very handy if one keeps a vehicle for any length of time as those issues can surface fairly easy when the wiring and vacuum hoses get older. I had an issue with an older Dodge once because the vacuum lines were used to change the heater settings. The lines were routed by the dash controls and they had started to leak after the car reached about 18 years of age.

Bilbo