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Thank you

Temp readings are as follows: Area directly around block heater is 96 degrees Radiator temp is 34 Upper hose for cab heater is about 70 Lower hose is 57 I should point out for reference purposes that I had the heater plugged in for 5 hours. I meant to do it for 3 hours, but I ended up going...

Yeah.. I will go buy an IR temp gun tomorrow.

1. Yes. 2. Both speeds work. You can even hear the difference from the drivers seat. 3. Haven't done that yet. However, the temp gauge does not move until I am already at work. At that point if I turn the heater on you can start to feel warm air blow out. 4. Haven't verified that they are...

So I tested my block heater today.. Block was warm to the touch, as it should be. I had another thought.. Is it possible that I could have a thermostat issue? Do the thermostats on these trucks fail in the open position, or the closed position?

To be honest I can't remember. However, I did try jiggling the gear lever, because there was one time a while back when I had a no-start. Turned out that I had left the truck in reverse.

It's a Kats 1000w freeze plug heater. After I installed it and used it for the first time, I did feel the engine block, and it was very warm. However, I have not tested it again since. I will do that after work today. Maybe it burned out already because it was faulty, or maybe the plug somehow...

Thank you! That makes sense now

Yup. I drain them after every use. Usually only get moist air coming out... Never any liquid water. Air dryer blasts out a decent amount of water when I am around see it. That's an interesting idea about removing the PPV valve. However, wouldn't that make the CTIS system go into action sooner...

I see. As far as the batteries are concerned, they are the original military batteries. I have not tested them, but they have been working fine. Maybe they should to be replaced.

Well.. I'm an idiot. After searching using different terms, I found the valve in question. PPV. And a link brought me to one that looks exactly the same as mine> http://www.vanhorntruckparts.com/product/20777/PR-2-Pressure-Protection-Valve/ It seems that this problem is not too uncommon...

Drove it to work this morning, as I have done since Monday. Everything functioned as it should (except for the lame stock heater.) It was 20 degrees when I left for work this morning, and it was only 28 degrees when I came back to the shop after I completed my job for the day. Parked my work...