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Fan will not turn off

Fan in freight liner truck wont shut off after engine is cool so in cold regions truck heat working very poorly

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  • Cars & Trucks Expert
  • 207 Answers

Check for a short in the wires to the connections to the heater, loss of antifreeze Hope that Helps

Posted on Jan 04, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

  • 611 Answers

SOURCE: Interior blower fan working intermittently.

sounds like ur blower resistor pack

Posted on Jun 15, 2008

landsend
  • 1066 Answers

SOURCE: 2001Jeep Grand Cherokee electric engine cooling fan wont turn off

relay sounds stuck...call a parts store for pricing

Posted on Mar 21, 2009

harley9701ha
  • 424 Answers

SOURCE: 2003 winstar no heat

Check the operation of the temperature control door. It is located in the center of the dash behind the radio. Look up between the gas pedal and heater case. It is white in color Move the temp knob while watching the actuator. If it is clicking it is bad. Good luck.

Posted on Oct 12, 2009

Testimonial: "hey thanks for the help,got the part took a bit to get in there everything kind of tight but we finally have heat...good job and thanks again"

j_del
  • 1586 Answers

SOURCE: BOTTOM RAD HOSE COLD TOP HOT. ENGINE TEMP ABOUT

Did you burp the air out of the system after changing those parts? It sounds like the thermostat isn't opening which is why the lower hose is still cold. Click my screenname, go to my tips and tricks, and choose the one about burping the cooling system - it may help you out.

Posted on Jan 28, 2010

SOURCE: Cooling fan continues to run too long with engine off.

The thermostat switch need to be check and change.

Posted on Feb 02, 2010

Testimonial: "Excellent Solution! My frustration is cured. This has annoyed me for two winters. One previous attempt produced no result. Thank you. "

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2 Answers

How does a heater cause overheating?


Here's a thought. If you use the a/c it turns on a radiator fan. If you changed it over to heat the a/c fan shuts off. So if the cooling fan was broke all a long then you wouldn't notice until you turned the heat on. How did I think this up. I owned a Ford once.

Aug 16, 2015 | Cars & Trucks

1 Answer

What causes a freight liner to have poor accleration


i'd get the engine serviced as could be one of many things

Jun 11, 2015 | Cars & Trucks

1 Answer

Coolant Sensor


extended crank time when cold, poor fuel economy, spark knock, lack of engine power,erratic or high or low idle,cooling fans run all the time.cooling fan fails to turn on, engine over heating. God bless!

Apr 05, 2014 | 2003 Pontiac Montana

2 Answers

Heater not working in extreme cold weather because fan wont shut off. fan has been replace and the computer has been checked. nobody knows what is wrong


I'm making some assumptions, here.. I've been told I make too many assumptions... but, I'm assuming that you're talking about the engine cooling fan.. If I'm correct in this assumption, my guess is that you've not taken the vehicle to a good, reputable mechanic or repair shop. There are several reasons that an engine fan would not turn off, and each reason would have to come from a qualified mechanic. For example, there is a sending unit for the air conditioning system that might cause continuous running... or a sending unit in the air conditioning system that could cause the same thing. To complicate that issue, quite likely your air conditioning system purposely kicks on the engine fan any time you run your defroster. Also, your inside heater should function correctly, regardless of the engine fan running continuously. If I'm wrong on that score, then your engine has a thermostat problem "to boot"... which, by itself, could cause poor heating of the inside of the vehicle. NOW, backing up a little, if you so happen to be talking about the fan INSIDE the vehicle that is part of your heating OR air conditioning, we have a little different matter on our hands... First, some vehicles legitimately have a fan running on slow speed at ALL times.. for continuous air circulation purposes (sometimes, you can't actually hear this). Also, I might add that THIS fan running all the time should not be a problem for the heater to work properly.

Jan 03, 2014 | Cars & Trucks

2 Answers

Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

2 Answers

How can I tell if the engine cooling fan is functioning properly?


The cooling fan is made to come on when the engine reaches a certain temperature. To give a simple and general test - turn the AC on high - it your AC and fan are both working correctly the fan should come on almost immediately. If not within very few minutes like 5 or 8.
Also at operating temperature the fan will run as well. In the early morning before you start the car open the hood - fill the radiator while the engine is still cold. start the engine and wait about 10 minutes or so. The fan should come on before the engine over heats. This may take up to 20 minutes and the fan is designed to run after the car is shut off IF - the temperature is hot enough.

Aug 12, 2011 | 2005 Chevrolet Aveo

1 Answer

Fans will not turn on therefore cause vehicle to overheat


cooling fan will not come on until about 230 degrees, if fans still do not work. check the fuses and relay. if ok then run a wire to fan from battery.on fan side connection, run a wire from battery positive to fan connection. run a wire from negative to ground connection.if fan will not come on it is either bad or the coolant temp, sensor is bad. because this sensor send info to pcm from various running conditions. it is very important that this sensor works. it can cause;
  • Extended crank time when the engine is cold
  • Poor fuel economy
  • Spark knock
  • Lack of engine power
  • Erratic and/or high idle
  • Engine cooling fan stays running all the time
  • Engine cooling fan fails to turn on
  • Engine overheating
  • Jun 20, 2010 | 1996 Nissan Sentra

    1 Answer

    Cooling fan won't turn off after car has been shut off for more than an hour.


    Over run on radiator fans is normally caused by a stuck relay, but if the fan eventually goes off, then the relay is working, otherwise it would keep running until the battery dies. there may be a timer in the relay to allow the fan to "run on", so as to not only cool the rad, but also to cool the engine bay, where the heat will well up. If a new stat was put in, it could be that the stat is stuck, and one side of the system is cold the other hot. check the inlet and outlet hoses on the rad, if the temprature diffference is extreme, then the sat may be stuck closed, or install backwards. Air is a poor onductor of heat compared to water, so unless there is an airlock in the system which will be evident from the differing heat areas of inlet outlet, the only other suggestion is to check that the water pump is working. it may have failed, or be clogged.

    Hope thtas help.

    May 05, 2010 | 2003 Jeep Grand Cherokee

    1 Answer

    Soon as i turn on my heat my cooling fans come on first


    It sounds like you do need a thermostat with your heat shut off and the gauge will raise a little then the car doesn't have that heat drawn from it indicating that you most likely do need a thermostat. As far as the fans coming on immediatly that could be a different problem it is most likely the coolant temperature sensor that tells the fan's when to come on. If this sensor says the coolant is hot the fans will come on immediatly. These are seperate problems as the coolant temperature sensor does not have anything to do with the cabin heating system. You should first check the level of your coolant is full, This could also cause your cabin heating system to perform poorly, and may have adverse effects to the engine cooling system. (fans)

    Dec 31, 2009 | 1995 Nissan Maxima

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