I just replaced the radiator and thermostat on my 96 blazer. It used to run around 200 degrees with temperature fluctuating and heat was a hit or miss whenever I turned it on, but now it's running at about 155 degrees and it pretty much does not fluctuate. heat is constant but not very hot (as expected with a running temp of 160). I asked for a regular thermostat, I cant see why I would get a 160 degree thermostat (the box of the thermostat was not labeled with any info). Is there any other reasons that my car is running cool besides me getting and installing a 160 thermostat?

 

Replace that thermostat with the correct 195 degree one and see how the temperature does.

 

u need the 195 degree thermostat I found that out when I installed the 160 it didt let the engine warm up enough to give u proper heat in the cab

 

I bet I cant replace the thermostat without re draining and filling the system huh? Or am I wrong?

 

you will need to drain about 1/3 of the system, just drain the rad, disconnect the upper and drain that aswell