I am installing an A/C system from a 76' 280z into my early 260z. Everything has fit very well and I do not see any major issues.

In my search through the archives, many have said to leave out the 2 magnetic switches because they are not needed and may leak. No real explanation as to how the system will work differently afterwards and no mention of the vacuum bottle. So my questions are 1- Can anyone tell me about how the system will operate without the 2 switches? and 2- Do I need the vacuum bottle?

Thanks for your help.

Skip Dawson

The tank stores vacuum for the operation of the mode doors, ficd, etc. One valve is for the mode doors and the other is for the ficd. The mode doors will work without them, tank and valve, but the on-off action will be slower. The ficd won't work preperly without the valve because it will be open whenever there's vacuum. So, unless you plug the ficd, you'll have fast idle constantly without the magnet valve to control it. So, essentially, without the valves, you won't have fast idle when the AC is on. Many aftermarket systems have no provision for fast idle. I'd say, if you can find good magnet valves and a good check valve, use them.

hello all, the problem i'm having is there seems to be not enough vac. created to operate the air intake or the mode door actuator in my 78 280z. i can see the rods just move a little and that's it . thanks for any help given.