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Re: Where is temp sensor
It should be located on or around the thermostat housing there should be two, One with one wire and the one for the fan should have two wires on it. and that is the one you want to change with 2 wires hope that you find it. Thanks bear001
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there are several sensors being added each year to our cars and trucks get the manual and make sure it is the right year Haynes or chilton at the library they have all the manuals the temperature sensor used to be in the bottom block of the engine on your right hand side if your facing the engine inside the water system.
There will two type of sensor, both are located on the upper thermostat housing, one is a sending unit, the other is temp sensor,if you pull one sensor and the temp gauge suddenly drop that is your temp sending unit.If you pull the other one and the vehicle kicks a high idle on and check engine light appears then you have the temp sensor
The power for the fan comes from 2 relays in the
junction block on the left fender. One is a high fan relay 40amp the other is the low fan relay 20amp.
If either one is stuck, it will power the fan. Also if the
engine coolant temp(ect)sensor is bad, it can send a
false signal to the engine control module(ecm) and powering the fan. With the engine cool, if the fans still
running. Unplug the ect sensor(on thermo. housing)
if the fan stops replace the sensor. If not pull the relays one at a time. And see which one stops the fan. If none of this works it may be an ecm problem.
Hope this helps.
On the 2.5 4cyl. The temp. sensor is located on the
transmission side of the engine below the coolant outlet. The temp sending unit is in the head in front of
the coolant outlet. On the 3.3 v6 the temp sensor is on the right side of the engine below the alternator.
The temp sending unit is to the left of the sensor.
Hope this helps.
clogged radiator. over flow tank cracked or to full. thermostat not opening at 190 degress.fans not kicking on. check relays. also check coolant temp sensor and temp sending unit. unplugg the coolant temp sensor it should kick on the fans instantly and illuminate the service engin soon light. do u have a digital cluster? if it is saying stop engin temp replace the temp sending unit. located on the back of the rear valve cover were the spark pluggs are closest to the driver side area
You have to refer to your owners manual or an after market service manual for fuse locations but that is not the issue. There is a sending unit screwed into the block with a temp sensor that closes the circuit on the ground side when the cooling system reaches a specified temperature. There is a fuse between the hot side and the fan for over current protection (see manual). A bad sending unit is most likely the culprit. Measure the resistance or continuity when the engine is hot from the sending unit body which is grounded to the block, and the output terminal or black wire running to the fan motor. It should be closed or read less than 0.5 Ohms. If it is open or very high resistance replace it. Good luck to you. I hope thishelps
Check the wiring from the relay to the fan motor, and check the wiring from the fuse block. Basically check all wires that supply power to the fan motor, use a volt meter. Fan Relay (behind headlight, under battery) on the 2001 GC 4.0L are a piece of ****, I change mine almost yearly. The problem is their location, a high heat area prone to the elements. I understand that 2002 and newer, the location was changed and the problem solved. Relay might close the circuit when cold or at reasonable temps, but might open a circuit when it heats up, causing the problem.
The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.