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Engine coolant temperature switch location - 1996 Oldsmobile Aurora

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Coolant temperature sensor should be on drivers side, rear engine area, on intake manifold.

Posted on Sep 06, 2009

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Posted on Jan 02, 2017

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Does my 2002 Cadillac Seville SLS have a cooling fan switch, and, if so, where is it located?


Cooling fan switch ?????? Has a engine coolant temp. sensor , That inputs info to the PCM/ECM - engine computer ! The PCM / ECM interpits the voltage signal from software programmed into it as to what temp . of the coolant is . When the engine coolant temp. reaches
The PCM commands the low-speed fans ON under the following conditions:
• The engine coolant temperature exceeds approximately 106°C (223°F).
• The transmission fluid temperature exceeds 150°C (302°F).
• The A/C pressure reaches 199 psi (1372 kPa).
The cooling fans will switch from low to OFF when the coolant temperature drops below 102°C (216°F).
The PCM commands the high-speed fans ON under the following conditions:
• The engine coolant temperature reaches 112°C (234°F).
• The transmission fluid temperature is more than 151°C (304°F).
• The A/C pressure reaches 260 psi (1792 kPa).
• Certain DTCs are set.
The cooling fans will switch from high to low, except when DTCs are set, when the coolant temperature drops below 106°C (223°F).

The PCM turns on the cooling fans by energizing three different relay's .
Watch this video
Relay Driven Dual Cooling Fan Diagnostics

May 29, 2017 | Cadillac Seville Cars & Trucks

1 Answer

Temp sensor on 1998 toyota tacoma 3400


The engine coolant temperature sensor is usually located on the thermostat housing. This sensor controls the readings of the coolant temperature gauge in your vehicle when the ignition switch is ON .Here's a link to the sensor. REMOVAL & INSTALLATION

  1. Drain the coolant from the vehicle.
  2. Disconnect the engine wiring protector from the brackets.
  3. Disconnect the sensor wire.
  4. Using a 19mm deep socket, remove the sensor and gasket.
To install:
  1. Apply a thin coat of Loctite or equivalent to the switch. By hand, carefully thread the switch into the engine. If resistance is felt at all, remove the switch and inspect the threads for any damage. Continue to install the switch. Once installed, tighten to 14 ft. lbs. (20 Nm).
  2. Connect the sensor wiring.
  3. Install the engine wire protector to the brackets.
  4. Refill the coolant. Start the engine and check for leaks.
http://www.autozone.com/engine-management/coolant-temperature-sensor/duralast-coolant-temperature-sensor/toyota/tacoma-2wd/1998/6-cylinders-n-3-4l-efi-dohc/61401_0_18589

Aug 01, 2015 | 1998 Toyota Tacoma

1 Answer

Need to locate the engine temperature sensor on my 1997 Pontiac Sunfire not the engine coolant temperature sensor


Some older models of cars had a coolant temperature switch; a two-wire device that was used to cycle the cooling fan, and an engine temperature sensor that was used by the ECM as part of the engine control loop. Newer cars (this one included) use the coolant temperature sensor for both purposes. There is only the one sensor serving both purposes.

Aug 05, 2014 | Cars & Trucks

1 Answer

Where is the tempurture cooling sensor located on a 1994 buick regal


The coolant temperature sensor is a thermistor mounted in the engine coolant stream. A thermistor is an electrical device that varies its resistance in relation to changes in temperature.

For 2.5L engines, the coolant temperature sensor is located on the left side of the cylinder head.

For MFI engines, the coolant temperature sensor is located on the intake manifold water jacket or near (or on) the thermostat housing.

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Fig. 1: Engine Coolant Temperature (ECT) sensor and connector


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Fig.: Engine Coolant Temperature (ECT) sensor location-3.1L (VIN T) engine shown

Hope this helps (remember to rating this and leave an testimonial comment about this free answer).

Oct 10, 2011 | 1994 Buick Regal Gran Sport

1 Answer

2003 Chevy Malibu where is the coolant temperature switch


2.2L (L61) Engine
The Engine Coolant Temperature (ECT) sensor is located just to the left of the exhaust manifold in the thermostat housing between the two coolant pipes.

3.5L (LZ4) & 3.9L (LZ9) Engine
The Engine Coolant Temperature (ECT) sensor is located on the left cylinder head at the rear. It is just above the transaxle mounting bolts.

Hope helps (remember to rate and comment this answer).

Sep 19, 2011 | 2003 Chevrolet Malibu

1 Answer

Temperature gauge is not working. where is cooling sensor located and what does it look like


This component detects the temperature of the engine coolant and relays the information to the electronic control assembly. The sensor is located by the heater outlet fitting or in a cooling passage on the engine, depending upon the particular type vehicle. The function of the sensor is to modify ignition timing, control EGR flow and regulate the air/fuel mixture. On vehicles equipped with the electronic instrument cluster, the sensor is also used to control the coolant temperature indicator.

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Fig. 1: Coolant temperature sensor (click image for zoom)



When the battery cable has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module relearns its adaptive strategy. The vehicle may need to be driven 10 miles (16 km) or more to relearn the adaptive strategy.

  1. Disconnect the negative battery cable.
  2. Unfasten the wire harness attached to the temperature switch.
  3. Place a suitable drip pan below the sensor to capture any coolant that may spill out during removal and installation.
  4. Using a suitable wrench or equivalent, remove the switch from the engine. Remove the washer from the switch and discard.



zjlimited_1214.jpg

Fig. 2: Coolant sensor at the top of the engine block


Hope helps (remember to rate this answer).

May 10, 2011 | 1991 Ford Aerostar Extended

1 Answer

The check enging light comes on then goes off. I foud out the code po118 engine coolant temp circut high input. is it the coolant temp sensor. if so how do I replace it. It is on a 2004 jetta tdi


According to Autozone.com:

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.



    Related Parts:
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Coolant Temperature Sensor printpage_icon.gif



0900c152801bfc38.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.

0900c152801bfc39.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown


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Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown

Oct 17, 2010 | 2004 Volkswagen Jetta

1 Answer

Where is the location of the coolant fan switch temperature sensor?


V6 2.8L top right rear of engine. Fan also turns on through A/C pressure switch and coolant temperature sensor, but these should operate independent of the coolant temp switch.
V8 5.0L and 5.7L (Heavy Duty) lower right rear of engine above starter.
Base model V8 uses the coolant sensor (top right of engine) and A/C pressure switches (lower right corner of eng compartment on A/C line to turn on the cooling fan. Fan is energized on all applications through the cooling fan relay.

Mar 03, 2010 | 1989 Chevrolet Camaro

2 Answers

Where is the temperature sensor for a ford e-150 van 1994 on a 300ci v-8 engine. Thanks rick


1994 Ford Truck E150 1/2 ton Van 5.8L MFI 8cyl Temperature Switch is located: Front seating area, center, under engine cover, front driver side of intake manifold, mounted in engine block.

The ECT sensor (Engine Coolant Temperature Sensor) is located either in the heater supply tube at the rear of the engine, or in the lower intake manifold. The ECT sensor is a thermistor (changes resistance as temperature changes). The sensor detects the temperature of engine coolant and provides a corresponding signal to the PCM. From this signal, the PCM will modify the air/fuel ratio (mixture), idle speed, spark advance, EGR and canister purge control. When the engine coolant is cold, the ECT sensor signal causes the PCM to provide enrichment to the air/fuel ratio for good cold drive-away; as engine coolant warms up, the voltage will drop.

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Engine component locations-1994 5.8L engines

I hope help you with this, good luck (remember rated this help).

Sep 02, 2009 | 2002 Ford E-Series

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