We have the above truck and seem to be having some issues with it.  It is a 2006 chassis.  When enroute to calls we do not seem to have any problems but onscene the heater does not seem to keep up with the demand for it.  The air comming out is warm just not hot.  When returning from calls the windos seem to fog at an alarming rate.  The heater mounted on the roof is on high and all vents pointed to the front and the middle lower crew heater is on high as well.  Neither seem to make a difference in the windows foging.  So what we are looking for is what have others tried to help with this lack of "hot" heat and the foging?

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I would first check the engine's thermostat.
Does the dash have a temp gauge?
Yes the dash does have a temp gage and normally runs around 175 degrees. It also has the hoses and valves that run under the cab on the passenger side that control the AC/heat. I thought I read somewhere that putting the "foam" wrap for house pipes on the hoses may help?
It seems and this is obvious that when driving down the road we have a warmer temp comming out of the unit but when ideling it is cooler even on high and full warm.
The valves on the hoses running under the cab are open? Valve handle inline with the hose? What is the temperature outside?
yes they are in the appropriate positions for winter use according to the manufactures book we recieved with the truck. The outside temp is really cold right now but we have had problems with this at all cool temps for the duration we have had the truck.
175 isn't very hot, not for coolant temperatures, anyway. Change the thermostat to something closer to 200, like 196, or so. That, by itself, will raise the temp by 20 degrees.
If it's a tilt cab, try running it until it gets warmed up, then tilt the cab and zap the hoses with a pyrometer, which will tell you exactly what the temp is at various points in the system. You may just be losing so much heat through the exposure to the cold outside temps that it's ineffective by the time it reaches the heater core(s). Insulation will definitely help if that's the case. I would still opt for the hotter t-stat.
If you email me the VIN number I will see what you have and maybe we can narrow it down a little bit. paul@rockisland.com Also, who does the regular maintenance on your rig?

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