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scottladdy Now you have insulted me by your characterization of me as anxious and scared - where in **** does that come from? I do regret providing a less than perfect set of observations regarding the state of the cooling system. In my own defense, all I was looking for at that time was...

Good one. Jim

Your concern about incorrect info makes sense. I am not convinced about my need for an IR gun. To backtrack - my initial reason for posting this was to get info on fan clutches to help me do the troubleshooting. The observations I reported initially were quick & dirty and misleading. The...

Skinny - I'm ignorant in many areas and I know it. Unlike most in that category I'm willing to ask questions and learn. However, I am not willing to go out and buy an IR thermometer for this little problem. If this thread is causing you a bunch of heartburn just ignore it. Regards Jim

scottladdy Still had some light so I ran the checks you described. The vehicle had been sitting outdoors for (4) hours since being driven. Air temp = 25°F. Started it and let it idle. Within 5 min. the crossover was noticeably warmer. The heater hoses warmed up as well. The crossover got...

If the cable is moving the shaft then it is probably OK. I suspect there is some sort of seal on the door which is crumbling or long gone and would let air into the core. I'll check the door situation as well. May not be able to do this stuff tomorrow - have a wedding anniversary conflict...

doghead and scottladdy If the new thermostat was installed upside down would it act as though it were wide open all the time? Regards Jim

I appreciate this and your post #6. I will go thru the steps you mentioned ASAP. Doghead provided info on fan clutches and based on that info I now doubt that is the problem - seems like the thermostat ought to be able to compensate by staying closed to keep the coolant at 195 deg even if the...

CUCV = non-thermal fan clutch. Therefore it will suck air when the engine is cold - just like this one does now. From what I've seen a non-thermal clutch is purely dependant on RPM and has nothing to do with temperature. Thinking out loud: --If the fan clutch failed such that the fan ran...

I'll do some troubleshooting tomorrow. Doghead attached a link to a tutorial about fan clutches so I learned something but it also raised another question - is this one a non-thermal or thermal fan clutch? This unit has been my DD for 3 years now. Cabin heat has never been anything to brag...

To bad re: fan clutch being non serviceable. The cooling system has not been power flushed - drained and fresh fill only. They may well be cruddy. My first impulse is overcooling because after driving 30 miles at 55 mph in 15 to 20 degree ambient temp the radiator, hoses and engine are what I...

Last winter the M1009 cab did not warm up too well. This winter it was worse. I could drive the 30 miles to town at 55 MPH in 25 degree weather and the radiator and hoses were barely warm. Replaced the thermostat with the correct 195 deg hockey puck and that made a very small difference but...