I am no techie but I think our clunker is all original parts at 220,000 miles. Truck starts easy hot or cold with the manual glowplug mod.
I think we had an incident a couple weeks ago with an injector and a ticking noise. I also think we had oil spewing into the intake and caused a slight runaway due to cleaning and using the old cdr
I got a new cdr unit that has a different design now. The unit, a rubber round grommet that mates to the intake, and a new rubber neck from the intake to the cdr, all from ford.
Also just today I warmed the truck up with the tick, turned it off and filled the fuel filter with atf. Started it up and within seconds the tick went away! Let it idle for a while then hooked the trailer up and pounded it hard up some hills and it still isn't ticking? I have no idea what this means but for now we are going to keep driving the truck
Our compression just last week with the truck warm showed from 385-440. I am actually going to pull it apart soon to install a head gasket/intake set as I suspect some minor issues.
As far as the defrost thing, we had the same issue with the selectors not acting right. Plus the truck stunk. I ended up yanking everything out of the truck, drilled out the rivets, took off the old weatherstripping and cleaned it up.
Terrible job you can only get to after you take the dash top off and get in there. Also be aware if you need to save money you will have to get some nice weatherstripping to keep the elements out and make sure you reseal everything good.
Also the internals have various flap doors that is nasty and you will need to use some good glue to place new foam on all of them. Also make sure all the paths from the cowl to heater/ac box are cleaned out before reassembly.
For us there was crap that was let down into the defrost area physically messing with the top trap door. Upon reassembly we are going to have to make some new vents because our dash is tore up.
Also all the flap doors are pretty strong except the one that seperates the main from the bottom area. This one is made with a single piece of white plastic that is thin and hinged. Ours was completely broken so it couldn't actuate and direct airflow.
I had everything apart and was able to simple use the existing frame and flap door and I used pieces of a 2 liter bottle and rivets to allow it to hinge and actuate.
Planning for thickness and cuts of the new weatherstripping and all of that sucked. I also had to use some foam cutting knives to shape various blocks of foam so all the blend doors would mate nicely.
Then there are all of the areas that need to be sealed between the housings and the firewall on each side.