Yeah, I guess errativ oil gauges are common. And yeah, I mine all have to do as well

 

Blend door actuator comes to mind.

 

Well guys & gals my heat works again!!! I ran some rad. flush stuff thru it last night for about a half an hour then dumped it & flushed the heater core out w/ the garden hose until I got clear water & ran clean water thru the whole sys acouple of time by filling the cooling sys. running it & dumping it (rinse & repeat) a couple of times & then filled it back up w/ coolant & water & now she'll cook ya out of the truck. I even checked the ac sense its getting warm & that works to so I'm happy again. No more cold 45min drives in to work at 5am.

 

does the blower motor work? if not replace it takes 15 mins 3 bolts to undo
under passenger side of dash.. if the blower works drain the rad add some CLR
into the hose coming out of firewall add enough that it trickles out let sit for 15 mins flush with water then blow some air through amazing how much crud will come out .. refill rad with coolant mixture and you will have heat like it is a new unit

 

mike- i wish i would'a known I could use clr have some under the sink. but like my post above yours said. I put some rad flush from orileys threw it & flushed the heater core w/ a garden hose & now she works like a champ.