The ISX that is in the last truck I had always ran right at the high end of the temp limits, and when I hauled oversized I had to use a mesh oversize load banner on the front or the thing would overheat and de-rate. You need to be absolutely sure that the system is fully purged and completely filled with coolant. Have you made sure there is no air in the cooling system? These newer trucks have the hoods so low that the cooling system is very difficult to purge all the air out after draining and refilling. You don't mention what truck you have, or how old/how many miles it has on it. It is possible that your old thermostat was bad, and the new one is defective. Cummins isx15 coolant temp sensor location PACCAR MX-13 EPA2010 Maintenance Recommendations Cummins N14 Celect Engine Available: N14 Celect Cummins Specs. Also, don't assume because you have a new thermostat that it should function perfectly, you might have gotten a bad one right out of the box. I would double check to be sure you replaced the thermostat with the correct temperature rating. The symptoms you describe in your last post indicate a stuck open thermostat. If I lost you somewhere, PM me and I will explain it again when I am sober. If everything is spec'd to the the proper operating conditions, there will be far less issues noticed by the operator.Īll this makes perfect sense to me right now, but I have been drinking whiskey. In Sinister's case, he is operating a unit that is working outside it's optimal spec, and doesn't have the expanded cooling capacity to keep things within the preferred operating temperatures in the warmer summer months when he is pulling high gross weights at higher than normal elevations for extended periods, which is why he ends up having temperature issues. Shop Cummins' Enforcer/ISX/QSX Diesel Engines Cummins' Aftermarket Diesel Engine Parts Coolant/Air Intake Temperature Sensor 4088832. Most trucks are set up to pull between 80-90k lbs, and have a rad capablale of cooling their truck under "normal" operating conditions bases on the engineered expectations for that use. 4903489 Cummins ISX/QSX15 Oil temperature sensor can be applied for. depending on the airflow under your hood at rest, when parked, and if you are parked facing the prevailing winds, you may never attain a temperature that causes your stat to open, and therefore never see "normal" operating temps in that situation. The coolant temperature is rising around 200F on outside ambient read more. Basically your water pump circulates water through the block, tranny cooler, cab and bunk heat exchange units, until it reaches a certain temp, then the thermostat will open up and let coolant into the system from the rad, and will lower the temp at this point and cause the thermostat to close again until it reaches it's pre-set opening temp. All engines are designes to bypass the rad via the thermostat in cold temps.
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