A/C problem since radiator fan swap

A/C was working normally and well before I had the radiator fans replaced with a used unit; now the a/c won't come on until the engine temp reaches 198-205 on the ultragauge. As long as the temp stays up, the a/c works fine, but if the temp drops below 198, the cooling stops. Any ideas? Thanks.

Seriously? In a week, nobody has a suggestion?

Is the fan running when you turn the AC on, or is it only kicking in when the engine hits those temperatures?

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I'm not sure--there's so much noise when I'm on the highway that I 'm not sure I can hear the fans come on. I'll try to find out.

It should come on even at idle as soon as the AC is switched on.

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Start the car in the driveway and engage the AC. If the fans do not start with the car at idle then there's a problem.

Steve

Just checked--with the car idling, a/c switched off or on, fans do not come on.

Looks like some one forgot to hook the fans back up or they were dead to begin with.