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Re: The Official John Lee Jr Thread
The size of the core does not dictate how much heat you get. Heater output temp is controlled by engine coolant temp. Example- a 1988-1998 Chev/GMC pickup heater core is less than 1" thick and about 6" X 8" aluminum. Average heater duct temp is somewhere between 120-140 degrees, in vehicles with a 195 thermostat. On older vehicles, generally you'll see vent temps around 105-115 due to poorly sealed and insulated ducts. The deluxe model heaters are usually a little less efficient because they have to heat the cold air coming in from the cowl,as mentioned earlier.
Having a well sealed cab is about the best thing you can do to help with good heat. As Sharps is doing, new door seals, window felts, etc will really help, as well as new seals on the kick panel vents.
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