Temp sending switch 3.8 1990 buick regal

here is link
copy and paste.
Once you have removed tank the fuel pump and sending unit are together.

https://itstillruns.com/how-to-change-the-fuel-pump-in-a-1996-buick-regal-12287768.html

High beams are on by pulling the lever toward you temp mode to engage the high beams simply push the lever forward the high beams should engage then.

One is for the fuel delivery, one is for the return and the other one goes to the vapor cannister.

Is this model Regal equipped with dual ac temp switches? If so, the passenger side temp switch is bad. Make sure both switches are in the cold position and try it again. If it is still acting up, simply replace the switch.

If the outside temp.sensor is reading -38 degrees then this is what is causing the compressor not to come on.You need to check the wiring to the outside temp.sensor and the sensor.Make sure it is connected.It is located on the front grill area.Between the grill and the bumper cover.Hope this helps.Good luck.

How warm does it get? The computer won't turn them on unless the coolant temp gets to 235

did you try changing the master switch(controls all windows and locks)? i would hook it back up to the way it was and change that master switch

the electric cooling fan for the radiator will not turn on when the engine reaches normal operating temp, its only supposed to come on if the engine temp goes over the normal temp. (around 220 degrees)
it is normal for the fan to come on any time the a/c or defroster is turned on.

sounds like it's tied into the coolant system..