Bravada Cooling

94 bravada, having some cooling issues. Even though it is cold outside I am occasionaly have heating problems with my truck. It doesn't overheat but, it goes from 200 where it normally sits to one bar up from that. Like I said it does not overheat but, it is winter, I am concerned about what will happen in summer when it is hot outside. Anyone have any idea's, had a problem with it last year with actually overheating and the radiator, water pump, thermostat were all replaced.

Also on another note I am considering maybe upgrading the radiator to a larger one and, also maybe a transmission cooler.

Any advice would be appreciated.

Can you hear or tell the fan clutch is "pulling in" and pull alot more air through the radiator? It should make that roaring sound like when you first start the motor cold.
I was told once that bugs and junk can get through the air conditioning condenser and clog the fins in a radiator...a trip to the car wash for high pressure spray.

I spoke with my dad and after he was able to experience what I was talking about he said there was nothing really wrong with it just a quirk of the vehicle but, thanks Chris. On another note does anyone know someplace I could get a trans cooler for a Bravada, Im still looking at this modification for a better drive.