Ac Question

98 Ford Crown Vic.

I know there is a hot or high side and a cold/low side to a veh. AC system.
I watched as the tech connected the gauges to the system and saw that the pressure would rise to 55 (I'm not sure of the values), then the radiator cooling fan would come on, then the pressure would fall to 25 then the fan would cut off, then the pressure would immediately begin to rise to 55 again and the process started over again and again and again.

At first they put in freon, then they took it out? (I don't really think they know what they are doing?), and I think they freaked out watching the pressure change.

The AC is not cooling properly. Is the pressure rising because not enough air is passing over the coils to cool the hot/high side, then falling when the fan comes on and cools it?, and, is it normal for the pressure to flucuate so much?

Is the fan going on and off because of the pressure change in the AC system?, or is the pressure changing because the fan is coming on and going off?..or it is "what came first the chicken or the egg?" and is irrelevant??

Bottom Line, IS THIS A FACTOR IN THE FACT THE AC IS NOT COOLING PROPERLY, AND WHAT NEEDS TO BE DONE TO FIX IT?

Thanks in advance!

It sounds like you have a circuit breaker cycling or a pressure switch going bad. It kicks in the presure and fan move. Then the breaker gets hot, cuts the off power until it cools off. Then the whole thing starts over and never blows cold air. Good Luck.