On 17 Jul 2014 17:14:20 GMT, KenK wrote:


Why? I doubt if they would do much, if any, good if the valve was leaking.
They get in the way when checking air pressure - if they weren't there I'd
likely check more often. All I can think of is to keep dirt out of valves?

TIA

Would you leave off the valve caps on your auto AC lines (high/low)?

They serve a purpose - dirt is one of the reasons.