This Is One Of Many Situations Involving Questions That Would Probably Be Answered By Reading A Factory Service Manual.
For every one of my vehicles and including, but not limited to, outdoor powered equipment, boat motors, etcetera, I always purchase hard-copy Factory Service Manual sets. They are in my home library.
When I purchased my used Grand Prix last Fall I ordered what I was told was one of the last brand new Service Manual sets (weigh about 7 pounds) available for that Make, Model, and Model-Year.
It doesn’t cost, it pays. I get answers to questions I’m curious about and often discover features on vehicles that are not covered in the Owner’s Manual. Procedures for proper cooling system and transmission servicing, brake servicing, torque specs, special tools, wiring diagrams, trouble shooting flow-charts, programming electronics, etcetera, are in these manuals.
I read my vehicles’ “build sheet numbers” (RPO codes) and look them up in the manual and discover things about the vehicle I didn’t know were there or available to use.
Over years and years of doing this I have found that an Owner’s Manual can supplement the Service Manuals (I know it sounds counterintuitive) and I utilize both.
I realize some will say that this stuff is available online, but I like to be able to sit down and read paper books. I’ve never regretted my purchases and will continue this until paper manuals are no longer printed.
I figure these books should come with every vehicle, but don’t. So, I just complete the vehicle by getting them.
CSA