1572,1772 temperature differance

[cvenezia]

Any ideas why my 1772 runs about 20 degrees cooler (130) than my 1572 (150). I checked the thermostats both are in and working. I used a laser thermometer and checked all around engine, Thermostat housing and radiator and all are about 20 degrees cooler. I also put a thermometer in radiater with same results.

 

[mmasheris]

The 640 has a bigger radiator thicker than the 1512 does.