bob89sentra

Hey guys does anyone know how many CTS an 89 sentra GA16i have? I know of the one for the radiator fan on the thermostat housing, and the one on the intake manifold above the water pump, which I assume is for the gauge in the dash. Is there a third one for the computer, or does it use the same one for the computer as for the gauge? I replaced the one in the intake manifold about a year ago, and still no matter what, It could be -10 Deg out side, and my gauge says I'm overheating (3/4 temp). The only way to cool it down, is to down shift so my RPMs are at 4,000 or above. I replaced the radiator, heater core, thermostat, water pump, both CTS that I know of, and did a radiator compression test, and no leaks. I've flushed the radiator many times, and it did not help. I took a new thermostat and drilled a hole .250", and the thing would not ever hit even 1/4 temp even in the summer. I also looked into the voltage regulator on the dash, and it did not seem to make any difference. I just rebuilt my entire engine about a month ago.... Had the crank turned, block bored, rebuilt a head from the wrecker, main and rod bearings, new water pump, oil pump, timing chain, tensioner, guides ect ect ect. I also did the swap from the automatic to a five speed stick. I love this car, and don't want to loose it. Any ideas on what to check next? This will not beat me I will win. Thanks for any info in advance. Bob

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89 Sentra owner 9 years 205,000 miles and counting!