Thermal radiation will not be recorded by infared film; infrared films are not sensitive to a long enough wavelength to show such things as heat patterns.
Heat sources from objects such as engines put out most of their radiated energy in the form of far-infrared, in the wavelength range of 10-100 microns or so. To detect this you need special infrared sensors, and generally they have to be cooled with liquid nitrogen or other temperature regulators that can get you well below 0 C. (Just as the inside of a camera has to be dark, the body of an IR detector intended to detect heat has to be cool ...)
Another way to look at this is:
if in a dark kitchen you turn your electric stove element onto high and heat it up to the point just before it begins glowing red hot, that is when you finally have enough IR waves being produced in the right wavelength to make a photograh.
On the other hand, according an ancient copy of the Kodak "Infrared and Ultraviolet Photography" book (1961), IR can be used to photograph self-luminant objects as cool as 250 degrees C. You could try to photograph hot car parts (exaust system, brakes).
Heat will however tend to increase the fogging of the film.Keep film as cool as possible and avoid leaving in hot places like in a car on a hot day.
Will the heat from my hands fog the film in the changing bag?
Only if your hands are on fire! (thanks to George Smyth for that gem)
Don't forget to visit
http://www.cocam.co.uk/
Their articles are a great read!
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