I now have heat in the cab. Had the coil many years, $20 for a fan and $8 for hose & clamps. It was 30dg outside and 80dg in the cab. I can control the temp with the fan switch.
http://oi40.tinypic.com/1sxd1i.jpg
http://oi39.tinypic.com/2ebbcbt.jpg
http://oi40.tinypic.com/1sxd1i.jpg
http://oi39.tinypic.com/2ebbcbt.jpg