Thanks!
I bought this pickup from my good friend in August. THe AC blew ice cold.
The heat has been intermittent...I will check all this out.
I noticed a clicking noise from time to time, coming from heat/AC controller...
I checked with HO Reillys about the control head. The O.E. replacement is no longer available, it was around $100.00 the replacement is the unit that had factory rear window defogger, has a plug over the rear defogger button, if not needed. It's around $200.00
I've only just begun this ordeal...oh well at least it's not a ford or dodge