Oh, and no chance of a stuck thermostat not allowing the truck to
properly heat up?
The Engine Coolant Temperature (ECT) sensor on
the 5.7L engine is located under the air conditioning
compressor (Fig. 12). It is installed into a water
jacket at the front of the cylinder block.
WARNING: HOT, PRESSURIZED COOLANT CAN
CAUSE INJURY BY SCALDING. COOLING SYSTEM
MUST BE PARTIALLY DRAINED BEFORE REMOVING
THE COOLANT TEMPERATURE SENSOR.
You must unbolt the A/C compressor and carefully move it out of the
way to replace the sensor. But check again that the sensor is
defective or not, as there are other problems which will cause this
Probably OK to drive. Most commonly, if the Check Engine Light is
steady on, it is OK to drive, but won't be effieient. If the Check
Engine Light is blinking, do not drive!
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