My S5 t2 was really hard to start when cold. Could take up to 15 minutes just to get it running.
So, I read in one of the post about the water thermosensor might be the problem. So, I ordered a sensor from Mazdratrix and waited for 5 days for it to appear. I removed the alternator and installed the sensor. But, no luck. So, I started reading again and I came upon a post saying maybe the contacts inside the plug had been pushed out and weren't making contact. So, back off went the alternator. And to my surprise, really, the wires were pushed out and they weren't making contact. I pushed them back in and glued them in place. Put the alternator back in place and it fired right up.

thanks to everybody that posted that fix.

 

Your welcome