i called flexalite and gave me to ways to test the thermal clutch and i tried and it worked fine. of course they were more than happy to sell me something else. where would you put a thermometer to check temp? have a menards thermal checker and it reads 205 on the upper tank or right on the inlet hose going into the rad. hate keep spending more money at this for sure. has to be something simple i just dont see it. thanksI am sure others will chime in, but I believe 200-210 is the typical range these engines like to run and I don’t know of any other method to get an accurate reading other than a mechanical temp gauge or thermometer. There are some that will use an infrared thermometer, but a lot of debate as to how accurate the moderate to low end ones actually are.
Nope. That's not a bad temperature differential between inlet and outlet. In fact, another 10 degrees would be nice... but with insufficient airflow through the core that can be expected. If you have air conditioning and don't have an original "Hot Idle Compensator" that will affect idle speed when hot... the factory added that to raise the idle speed to suck more air through the radiator. Also, run as much spark advance as the engine will tolerate to reduce the temperature of combustion and the amount of waste heat the engine produces.well i bought a mechanical temp gauge. just let the engine idle for 45 min and it went up to 235. slow but sure, will come down a little if i increase the rpms. for comparisons i used my thermal gauge on the upper tank and had 230 at the right side of the upper tank away from the inlet hose. the loer hose outlet was 180. doesnt seem right to me, big difference.