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First thing to check is to make sure the car has that blank panel beside the radiator still so cold air isn't hitting the motor directly and cooling it down. If that panel is in place I would say next would be check the thermostat. It is probably not closing all the way. In the summer it won't matter but in the winter even a little bit of flow out of it would make the car run cold. I just got a new 195 thermostat at the auto parts for $6 today, I just noticed that I only had a 180 in there. For the price of them it is no big deal to just replace it if the guy even halfway thinks it is bad.
Also some people bypass the fan temperature switch when it goes bad and just let the fan run all the time, if the car has the fan always running then putting the switch back would help keep it warm.
If the car still won't warm up I would recommend restricting the tail pipe down by about half so there is only a 3/4"-1" hole out the end of the pipe. That will help warm it up faster and keep it warmer.
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