fans work with temp sensor unplugged

Radiator fan not turning on automatically | AnandTech ...

2009-03-29· First when you did this step "unplugged the temperature gauge connector (next to coolant temperature sensor) in engine bay. Gauge on dashboard unresponsive" and the gauge did not respond, then that is most likely the Sensor to tell the Fan when to come ON .. Also they work by completing the ground path to the engine computer input, which in turn will turn the fan on. Most cars (GM for ex) the ...

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pontiac - Cooling fans not running - Motor Vehicle ...

Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more ... If I disconnect the temperature sensor, both fans come on immediately. So, I replaced the temperature sensor. The problem persists; the engine will reach 200, the thermostat opens (determined by watching the temp. gauge), but the fans do not start. If I disconnect the (new ...

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radiator fan won't turn on unless switch unplugged? | Ford ...

2008-09-05· no pi swap ..well i was reading my repair manual an theres supposed to be a coolant temp. sending unit (thats the 1 if i unplug the fan comes on) an theres a coolant temp. sensor..an i guess since theres a different intake its not there cuz i cant find where its showin its plane out where it is but its not there...an on the coolant temp sending unit in the manual it shows the connector an wire ...

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Radiator Fan Only Works When Temperature Sensor Unplugged

2017-11-10· It is a simple system as cooling fans go. The ECT sensor tell the PCM the temperature, at 209 degrees the PCM sends a pulsed power signal to the fan control module. That signal keeps getting faster as the temperature rises. The control module gets that signal and uses larger power transistors to pass the pulsed signal to the fan.

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420 Rancher OverHeat (fan not on) | Honda ATV Forum

2020-07-12· First thing first is to check the fan and make sure it'll work. Then I read there is a temp sensor that triggers the fan to come on which I'll probably end up replacing for not sure that can/could be tested. Any help would be appreciated. Save Share. Reply. mrbb · Registered. Joined Oct 4, 2011 · 8,309 Posts #2 · Jan 19, 2015. get a service manual, it will tell you how to test the fan, and ...

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1984-1996 Corvette Cooling Fan Control Mods | CC Tech

2018-10-05· Highly modified engines work best when both of the fans come on simultaneously. Splice the dark green wire from the new harness to the dark green/white striped wire at the primary relay. Splice the dark blue wire from the new fan switch harness to the secondary relay with the dark blue/white striped wire. 1994-1996 Corvettes: Locate the relays with four wires (one relay has five wires for half ...

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Cooling fans wont run when sensor is plugged in - Pontiac ...

2017-05-11· you should use a scanner that can show you the data stream. the computer (powertrain control module) controls the signals to activate the fan relays. the scanner will show you the coolant temperature and the fan request for both low speed and high speed. you can watch the temperature rise and see if the fan request says yes and then check to see if the relay acts on the computer's signal.

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Engine temp light on, fan won't come on | PRC Polaris ...

2009-10-19· If it's a 700, your ECM may be bad. Several of the '06 XP's (and a few '05's) have had the ECM go bad and the fan not coming on is one of the symptoms. But first you should check to make sure the thermistor (essentially the temp' sensor) is working. Unplug the two wire harness from the switch and the fan should default to "on" with the key on.

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Cooling fan temp switch | LS1LT1 Forum

2011-08-10· This morning before work I stopped at autozone and picked up a new relay, ect sensor, and temp. switch. I know i bought them prematurely but I work 10 to 10 for the next 4 days and i work at a shop where i have time in between to go outside and work on the car. The fan never comes on even when the gauge hits the top or even with the a/c on ...

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5 Reasons Why Your Radiator Fan is Not Coming On [Fixes]

2021-06-09· Remember that if the fan fuse is blown – there might be a problem with the wirings or the radiator fan. Faulty Coolant Temperature Sensor. There are often two different systems in different car models. Either your fan control is integrated into the engine control unit or you have a separate fan control module. In both cases, the control units use a temperature sensor to know when to start ...

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cooling fans not running - pcm failure? | LS1LT1 Forum

2012-04-16· When you unplugged the temp sensor and the fans didn't run I hope you unpluged the one on the water pump. The other temp sensor is just for the temp gauge. The pcm's on these cars don't fail very often, but if it helps to put your mind at ease, replace it and see. Here's a link to search salvage yards, you can search local, statewide , or whole country as most yards ship.

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• Electric cooling fans not working ...

2018-06-18· I unplugged the engine coolant temp sensor and the fans still did not come on. I believe they’re supposed to default to “on” if there’s not signal from the coolant temp sensor. I wired the fans directly to the battery and they work. I swapped all 3 relays with the same relays in my 2005 Lesabre. The electric fans still work in the Buick when AC is turned on, but the problem still ...

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Overheating problem, Is it the temp sensor? | Chevrolet ...

2013-08-15· -Fans do not turn on on their own. -If I unplug temp sensor both fans work at high speed and the car does not overheat. (I did not drive the car since I did not wanted to risk anything, but the heated engine worked for additional 15 minutes without overheating if temp sensor is unplugged and no water bubbles was seen in the reservoir)

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Fan only turns on when the temperature sensor is unplugged ...

2020-10-25· Fan only turns on when the temperature sensor is unplugged. Jump to Latest Follow 1 - 3 of 3 Posts. R. rexT007 · Registered. Joined 10 mo ago · 10 Posts . Discussion Starter · #1 · 9 mo ago. While troubleshooting on the fan not tun on while overheating. The fan works when powered by a 12v battery. So wanted to check if its a relay issue so I bypassed the sensor but the fan didnt work. So I ...

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Engine cooling fans do not come on, they operate when the ...

2018-08-19· Engine cooling fans do not come on, they operate when the ECT sensor is unplugged, replaced sensor, no change. Mechanic's Assistant: Which particular sensor are you asking about? And have any trouble codes been triggered? ECT and A/C pressure sensor are fine. Mechanic's Assistant: What is the model/year of your Chevy? Fans come on when ECT sensor is unplugged

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SOLVED: Car overheats. i unplugged temp sensor and fans ...

Car overheats. i unplugged temp sensor and fans suddenly came on and coolant started to flow. hoses werent backed up any longer. so i replaced fan relays and car is still running hot. Posted by davidswarrio on Mar 28, 2010. Want Answer 0. Clicking this will make more experts see the question and we will remind you when it gets answered. ...

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Honda: Why Won't My Radiator Fan Work? | Honda-tech

2015-04-06· The ECT sensor monitors the coolant temperature, and allows the fan to turn on if the coolant is too hot. If this sensor is faulty, a replacement costs around $25 to $45. Follow these steps to test it: Locate the ECT sensor, which is just below the distributor. Unplug the sensor. Bridge the gap in the sensor connector with jumper wires. See ...

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