Question about 1986 Chevrolet Monte Carlo

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Bypass coolant temp switch

Can you bypass the coolant temp switch

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No, to many thing depend on it

Posted on Apr 01, 2014

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Posted on Jan 02, 2017

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1 Answer

1993 explorer temp gauge not working, change coolant temp sensor no luck, does this model have a coolant temp switch?


In fact it does! he coolant sensor is used by the PCM to control the engine fuel ratios at various temperatures. The coolant switch is used only for the gauge, since the explorer has a mechanical rather than an electric fan. Here are pictures, first is the Coolant Sensor (which you claimed to have replaced), then the switch, which is probably what you need. If the switch doesn't fix the problem, the gauge itself is probably faulty.



26020551-5lwd1tlkqjpbtdbalwg14peg-2-0.jpg

26020551-5lwd1tlkqjpbtdbalwg14peg-2-1.jpg

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1 Answer

How can we bypass the cooling sensor by the thermostat?


Om most vehicles, you can't. The coolant temperature sensor sends a variable signal to the ECM based on coolant temp, and that value is used by the ECM in the computation of the fuel mix (rich/lean) to the injectors. Without it, the vehicle will run poorly, if at all, and will set the Check Engine Light. There MAY be a separate coolant sensor that simple controls the radiator fan. This one could be bypassed, but that comes with great risk of engine overheating and damage. Most newer cars use the coolant temp sensor for both the fuel mix and the radiator fan with the fan on/off signal controlled by the ECM.

Oct 11, 2015 | Cars & Trucks

1 Answer

Overheating at low speed


Check your radiator fan power plugs (2X), the fans should turn on when coolant temp reached 95C. Also you can plug in the GREEN plugs underneath the driver side to verify if fan is function properly, this will turn on the fan, bypass coolant temp sensor. Once you're done testing, disconnect the GREEN plug.

Jul 21, 2014 | 2002 Subaru Outback

1 Answer

Where is the temp gage sensor location 2001 merk cougar


Hi there,

The temperature gauge relies on readings from the Engine Coolant Temp (ECT) Sensor.

The ECT sensor is usually located on (or near) the thermostat/coolant housing.

Refer to component No. 8 (2.0L Engine):

wolfman304_70.gif


Refer to component No. 9 (2.5L Engine) locate under bypass tube:

wolfman304_71.gif

Hope this helps.


Cheers,

Aug 27, 2011 | 2001 Mercury Cougar

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Radiator fan switch or coolant temp sensor however it is called is not activating the radiator fan when temperature is high. . .iS THERE a way to by pass this switch or sensor so it can activate the...


CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD.HOT WIRE COOLING FAN TO MAKE SURE COOLING FAN MOTOR IS WORKING. IF COOLING FAN RUNS WHEN YOU HOT WIRE FAN MOTOR.CODE SCAN FOR ECM FAULT CODES.REPLACE THE ENGINE COOLANT TEMPERATURE SENSOR NO NEED TO BYPASS THE SENSOR.

Aug 22, 2011 | 2004 Suzuki Aerio

3 Answers

2000 bettle 1.9L turbo will only start if you unplug coolant temp sensor


Hello and welcome to FixYa!

If that's the case, I strongly suggest that you replace the coolant temp sensor. Looks like it's faulty and grounding the circuit. The car's computer can detect it that's why it won't start but once you disconnect it, it will for the coolant sensor is bypassed.

Hope this helps and thank you for using FixYa! Have a good one!

Apr 14, 2011 | 2000 Volkswagen Beetle

1 Answer

1995 Pontiac TransAm w/5.7 l v-8. Overheats at slow speeds because the elec. fan does not start until the engine temp reaches 220 or more. Could I install a toggle switch w/ a diode in the coolant temp...


I think 220 is the proper temperature for the fan to turn. 220 is too hot and that's why it is turning on but should never have to ideally. What your car likely needs is new coolant and a new thermostat. I recommend a 185* thermostat.

Dec 02, 2010 | 1995 Pontiac Firebird

1 Answer

2002 Millenia, over heats when idling for 20 mins or more, have not seen either (2 cooling fans) go on. One fan truning by hand moves freely and the other it is difficult to move.


Possibly a siezed fan, disconnect fan plug, run a wire from positive (+) battery terminal to fan and same on negitive (-) terminal, to the pins on the fan side of the plug dont touch them together while connected to battery, if fan goes it may be a coolant temp on the engine. bypass temp switch with a loop wire on to wiring harness side of the temp switch. Both fans usually only operate when a/c is on.

Apr 20, 2010 | 2002 Mazda Millenia

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85 Corvette Temp Gage fluctuates from 170 - 250


Being an 85, chances are that your radiator is partially plugged (calcification develops on the core ends and prevents proper coolant circulation)
Sometimes a flush will help, or you can change the radiator.

Jun 18, 2009 | 1992 Chevrolet Corvette

1 Answer

Thermostat instalation


lets first check the COOLANT level.
then check the coolant bypass valve located in the coolant line itself.
Afterwards we can come to the thermostat.

May 31, 2008 | 2000 Ford Focus

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