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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Mine was running cool to and I had a stuck open t-stat. I replaced it (wasnt hard at all) and now it is running the correct temp and the heater warms up like it is supposed to.
If it is a fail safe tstat (and fails correctly) it will allegedly fail open, not allowing temp to rise. Can't believe the cooling system is that efficient. If mine ran 70 I wouldn't have to run AC!
If the TC is locking up, the coolant is getting to at least 140º. Or are you talking Celsius? In that case 70ºC is 158ºF, which is still too cold. Replace thermostat and go from there.