Couple things with that statement I want to point out (will I get in trouble if I do? :tongue... first (being nitpicky), Freon is the DuPont trademark for R12. R134a has no brand or trademarked name. Second... if your car bogged down every time the clutch cycled, there was something else going on with it. Yeah, you'll notice when the clutch cycles if you're in tune with the car (vibrations, feel, power levels)... but if it was bogging down every time the clutch engaged there was something else wrong with it. Even when my old 3.8 Cougar was low on refrigerant it could negotiate hills at 35 or 36 MPH in 4th gear with the clutch cycling.Sounds low on Freon. When my 97 was low it drove me crazy - the car constantly bogging every time the clutch kicked on. Going up a hill at low speeds was not fun.
I was merely pointing out that the small drag you get when the A/C kicks on at low speeds climbing a hill (and you know what I'm talking about), was far more noticeable when it cycled constantly from being low on R134a. I know its slow around here and all but jeez......... if your car bogged down every time the clutch cycled, there was something else going on with it.