Question about 1999 Chevrolet Venture

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Engine cooling fan does not come on, but if you unplug the coolant temp sensor the fans will come on

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  • Master
  • 3,092 Answers

You found the problem, bad coolant temp. sensor, replace it and it's fix.Hope this was very helpful.

Posted on Aug 26, 2010

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  • Chevrolet Master
  • 17,130 Answers

Did the engine reach the temperature for the fan to come on, if so then the temperature sensor is faulty as it might be a faulty switch.
remove the sensor and test the sensor on a hot water for variation of the resistance. if the switch shows this change then it is working fine or else the sensor must be changed.
If the sensor works the fan will switch on.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

leetamara
  • 702 Answers

SOURCE: Cooling fan wont work

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.

Posted on Sep 27, 2008

mnabi01
  • 94 Answers

SOURCE: cooling fans on 2001 chevy malibu will not come on unless ac on

the relays control circuit is grounded by ECM (computer) . to check this make sure the is hot enough for the fans to be commanded on by computer and check to see if you have voltage at relay and it has ground from computer . you may need ECM.
good luck

Posted on Jan 28, 2009

wyatt1582
  • 453 Answers

SOURCE: cooling temp sensor

Should be located on the lower intake on right or left toward the front. Two wires watch cause there's and air temp that might look the same.

Posted on Mar 26, 2009

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3 Answers

2006 chevy Silverado Electric cooling fans do not come on. Replaced all relays. Checked the fans by hot wiring them to the battery and they function. Other than the PCM what else could it be?


Did you check the fuses, any voltage at the fuses? In the picture, the left side of relay is control, the pcm grounds the control side of relay. Any applicable trouble codes? Check the coolant temp sensor. I'm not saying replace anything. Will the fans come on if you turn on the ac?
The fans should come on around 220 degrees F. Some makes and models, if you unplug the coolant temp sensor, the fan/s may run all the time? The info I looked at was for 1500--5.3L engine--non-hybrid.
cooling fan 1-a2koxpatrcthkuw0fex1osdc-2-0.jpg

cooling fan 2-a2koxpatrcthkuw0fex1osdc-2-2.jpg

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2001 montana cooling fans not coming on


A pontiac montana ? There are three relay's that control your cooling fans ! unplug what sensor ? The engine coolant temp. sensor is an input to the PCM - engine computer . When temp. reaches 213 degrees the PCM energizes the relays , depending on low or high speed . Using a scan tool to see if the PCM will turn on the fans an checking engine coolant temp.data is the right way to diagnose this . Relay Driven Dual Cooling Fan Diagnostics

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1 Answer

1997 Chevy Lumina 3.1 engine. The cooling fans aren't coming on tell the car heats up to over 250 degrees.


Did you check for applicable trouble codes? Anything? Some of the national brand auto stores will check codes for free.
Check the coolant temp sensor, if you haven't already? Some makes and models if you turn on the ac, the fan/s will run. If you unplug the coolant temp sensor, the fan may run.
I might want to use non--contact infrared temp gun just to double-check temp gage.
Have you ever checked thermostat or coolant flow through the radiator. I understand it only heats at idle.

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2 Answers

Engine coolant fan wont come on. The fan motor is fine. whats next?


You still have many other components in that system that has to be in working order for the cooling fan to work properly. The cooling fan is turned on when engine temp reaches a predetermined temp, usually around 220-230 degrees F. the ECT (engine coolant temp) sensor siganls the ECM (Engine Control Module) to ground the cooling fan relay or cooling fan module(if equipped) and if the cooling fan fuse is good and the fan has power to it the realy will complete the ground for the fan to run. You may need to have a qualified technician diagnose the problem if the obvious things like fuses and good grounds are not the problem.

Hope this helps.

Oct 22, 2013 | 1999 Ford Contour

1 Answer

Primary cooling fan only comes on when i turn ac on


You would need a scanner and an inferred temp sensor to troubleshoot the system.
You need to know what the actual engine temp is, and what the temp sensor is telling the computer.
If and when the engine reaches 220 degrees, the engine temp sensor should be sending that data to the computer and it should ground the fan relay to activate it.
Unplugging the sensor and having the fan run tells you the sensor is connected, and there should have been a trouble code set at that time.
It is possible the coolant level is low, or something else preventing the temp sensor sending the correct data.

Apr 16, 2013 | 2002 Chevrolet Malibu

1 Answer

1992 Ford Tempo Coolant Fan


the "sensor " near the thermostat should have 2 ,3 or 4 wires to it
if it only has one wire , that is the temp gauge sender unit and not the coolant sensor the coolant temp sensor reports to the ecm and that unit then switches on the fan relay that spins the fan
if you unplug the coolant sensor and the fan starts to run you have a serious coolant temp sensor circuit problem
take it to an accredited service center and have it sorted

May 01, 2017 | Ford Cars & Trucks

1 Answer

I have a 2001 chevy impala with a 3400 v 6. when the engine is cool the fans run but when the engine reaches operating temp the fans go off.


If the check engine light is not on, I would want to check the computer with a scanner to see what the temp sensor is telling the computer the coolant temp is. The problem could be in the computer or the fan relay.

Sep 05, 2012 | 2001 Chevrolet Impala

1 Answer

Car runs hot at an idle. turn on the air and the fan comes on and cools off . does the ect control the fan function when the air is off? 1994 camaro 3.4.


The Cooling fan is Wired in in such a way so as to Automaticly Turn on Cooling Fan If the A/C is Switched ON. If "WITHOUT the A/C on" The Cooling Fan Doen NOT come ON Untill Engine. is @ 210-230 Degrees
There IS a Problem with the Engine COOLING SYSTEM, A Faulty Coolant Temp Sensor Will Cause this Problem. The Cooling fan is Also A Candidate For Testing.

Answering your Quwstion YES The Engine Coolant Temperture Sensor Tells the ECM What the TEMP Is and the ECM Grounds the Cooling FAN Relay to Turn ON Cooling FAN. Temp Sensor is the Usual Culpret, BUT Relay Comes in a CLOSE Second. Hope this Helps !!!

Jun 15, 2009 | 1994 Chevrolet Camaro

1 Answer

My 1987 Chevrolet Z24 Cavalier cooling fan will


since you have already tested fan and relay and both work, the problem may be the engine temp sensor. There are two sensors. One goes to instument cluster. This is engine coolant temp sensor, the other is engine temp sensor which is usually attached to engine block, sometimes they are connected to thermostat housing with the coolant sensor. You can pully the engine temp sensor and test that sensor same way as relay. (with mulitimeter)

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1 Answer

Electric fan will not turn off.


couple posabilities first run car up to temp then turn off...when fan stays running unplug the coolant temp sensor for the fan< there are 2 other is for comp/gauge> if fan turns off replace sensor if not replace relay for cooling fan

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