The fans are controlled by the ECM and it uses the ECT sensor for temperature sensing, so if the check engine light isn't on the sensor is not the problem. You need to have an active test run on the fan system to see what code is returned. Have you tried powering up the fans at the relay?
SOURCE: my 1998 buick regal non turbo 3800 radiator
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.
SOURCE: fans run constantly
Irwinr12 is right, no amount of fan will keep the Regal from warming up if the thermostat is working properly, Replace it. Clear SES light with OBDII tool & you should be good to go. BTY its the car computer that keeps the fans running, and they will continue to run until you clear the code. Any kind of cooling/overheating proiblem will kick in the SES light and set both fans running. I own '01 GS, my son has '03 GS and we have both complete set of service manuals. Trust me, do what I say. Batman
SOURCE: Where is the location of the thermostat on '95 Buick Regal 3.1
Here's a link with pictures etc, you just have to scroll down page to 3.1L engine. Click on pictures to expand if necessary.
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c15280067bd6
SOURCE: I have a 1993 buick regal custom with 3.8 V6 fault codes
Idle position switch or sensor. I had 93 that would stall when i came to a stop. Cost me $43 but it was worth it. I don't know if this will fix it, but it sounds like it would.
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