Engine cooling fan dash light not working

Hi guys, I posted this over in the KW section but havnt gotten and replys so I thought I would try here in the Pete section and see if anyone might be able to help. Looking for suggestions to get my engine cooling fan lamp in my overhead warning cluster to work again. It does come on when I first turn key on so I know it's not the bulb. This lamp used to come on when I would manually turn engine fan on and if I'm not mistaken it would also come on when the fan automatically kicked on. This lamp hasn't worked in a while. I replaced the ac compressor a couple weeks ago and I think the engine fan may be running a little more than it should but I really can't hear it when it's on if I'm traveling at road speed. Any one have any suggestions or tips to get this lamp back in service? Thanks in advance for any info.