It would depend on the degree thermostat installed, probably 195 degrees F.
located coolant temp sensor
P0128- coolant thermostat ( coolant temp below regulated temp)
Where is coolant fan switch located on 1998 chevy Malibu with 3 .1
The coolant temp sensor screws into the thermostat housing. This is located where the top radiator hose connects to the engine.
Engine coolant temp circuit high input. The engine coolant temp sensor make be bad.
The coolant temp sensor on a 2003 Chevy S10 V6 is located on the front of the intake manifold. To replace simply unscrew the old sensor and screw on the new one.
chevy mounts the cts on the underside of the thermostst housing
My Knowledge is temp. coolant sensor the small one.
Trouble code P0128 means:Coolant thermostat (coolant temp below thermostat regulating temp)
The coolant temp sensor will be located very close to the thermostst housing.
Usually on the coolant outlet just before the upper radiator hose.
coolant temp sensor,does just what it says,it relays your coolant temp to gauges!