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NO, the A/C high pressure switch runs the fan in low speed only, the engine temp sensor runs the fan in high speed only.
Since it is rather unlikely that you actually have high pressure in the A/C system it is reasonable to assume at this point that it's the high pressure switch. Since the system will need to be hooked up to a recovery machine, the person doing the AC work can verify what the high side pressure is before evacuating the system to make sure the fans shouldn't be running. If the pressure actually is too high then they can remedy the real problem.
If you are opposed to having this all done, then you could leave the high pressure switch unplugged or pull the low speed relay, and simply correct whatever you've done when the outside temps are quite hot. There is no real danger in leaving it unplugged (the high speed fan is though), the AC just won't cool as well on hot days.
I know some owners have just installed their own on/off switch for the low speed fan and will switch it on when they need it, like on hot days or sitting for a long period in slow moving traffic, another option.
Gilly
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