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Car Runs Hot. Cooling Fan Not Doing Its Job.

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here Car Runs Hot. Cooling Fan Not Doing Its Job.

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  • #580326
    the metal bisonthe metal bison
    Participant

      I’ve got a 97 Acura 2.2CL and I have replaced the radiator recently, put in new spark plugs and wires and also a new fuel filter. A tune up.
      I put a new cooling fan in yesterday because the old one would never come on causing the car to run hot. I took it for a test run and found that it still does not come on. The car runs hot. Only after I turn off the ignition does the cooling fan come on.
      I noticed this, so I thought maybe it was a fluke. I turned the key back to the on position, and the cooling fan cut off. I turned the key back to off and the cooling fan came back on. It only wants to cool the engine when the car is off!

    Viewing 13 replies - 1 through 13 (of 13 total)
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    • #580376
      619DioFan619DioFan
      Participant

        sounds like a bad coolant temp sensor.

        #580472
        EricTheCarGuy 1EricTheCarGuy
        Keymaster

          It’s likely a problem with the fan timer. I had a similar problem with this vehicle. Also, fan timers on Honda’s are known for failure.

          That said, you MUST be sure to purge all the air from the cooling system whenever doing cooling system work. Failure to do so can effect cooling fan operation as well as engine performance. I recommend you bleed the air out of the system and recheck for the problem. If it’s still there, then look into the fan timer.

          Keep us posted on what you find.

          #580497
          the metal bisonthe metal bison
          Participant

            I’ll check the temperature sensor, thanks.

            Eric, I’m not sure what to look for when you say fan timer. Keep in mind, everything I know about cars is learned on youtube.

            Meantime I’ll check for air in the system.
            Thanks for the responses.
            I’ll keep you posted.

            #580520
            EricTheCarGuy 1EricTheCarGuy
            Keymaster

              Forget about the temperature sensor. First check for air in the system then I would suggest watching the video I posted for you, as it not only explains the operation of the fan timer, it also shows how to diagnose it.

              #580565
              ChrisChris
              Participant

                When bleeding the system it helps to park the car on an incline with the front higher than the back.

                #580573
                ChrisChris
                Participant

                  Hi Eric my name is Chris I have question for you. I have a 90 honda accord dx and I recently rebuilt the engine. I changed the water pump, thermostat, it has two new fans that run correctly, when I drive the car it doesnt run hot but when I use the A/C it starts to overheat. I have changed the radiator about a year and a half ago. When I was in the process of rebuilding the engine I noticed that there was a bit of blockage around the number 4 cylinder wall also my thermostat gasket had deteriorated a bit and went into the cooling system. I tried to flush the radiator before I had placed it back in. While I was flushing the radiator I noticed pieces of the thermostat gasket were stuck in the channels of the radiator along with other sediments. I tried to flush the radiator with some hot water and noticed that only one side of the radiator was feeling hot and the other was not. The side thats not getting hot is the side where the A/C fan is located. Does this mean that there is blockage in there and the fan cant cool that side?

                  #580582
                  Lee AnnLee Ann
                  Moderator

                    I have a similar problem as metalbison: My cooling fan (’97 Saturn SC2) only turns on if I turn the AC on, which is an improvement from my last post about this topic. I am guessing I should bleed the system of air since I recently replaced the upper radiator hose. However, I have an expansion tank. I can use it like a funnel, correct?

                    #580641
                    college mancollege man
                    Moderator

                      [quote=”blusmoke2013″ post=91218]Hi Eric my name is Chris I have question for you. I have a 90 honda accord dx and I recently rebuilt the engine. I changed the water pump, thermostat, it has two new fans that run correctly, when I drive the car it doesnt run hot but when I use the A/C it starts to overheat. I have changed the radiator about a year and a half ago. When I was in the process of rebuilding the engine I noticed that there was a bit of blockage around the number 4 cylinder wall also my thermostat gasket had deteriorated a bit and went into the cooling system. I tried to flush the radiator before I had placed it back in. While I was flushing the radiator I noticed pieces of the thermostat gasket were stuck in the channels of the radiator along with other sediments. I tried to flush the radiator with some hot water and noticed that only one side of the radiator was feeling hot and the other was not. The side thats not getting hot is the side where the A/C fan is located. Does this mean that there is blockage in there and the fan cant cool that side?[/quote]

                      If your in need of help please start a new thread. 🙂

                      #580643
                      college mancollege man
                      Moderator

                        [quote=”lar1969″ post=91223]I have a similar problem as metalbison: My cooling fan (’97 Saturn SC2) only turns on if I turn the AC on, which is an improvement from my last post about this topic. I am guessing I should bleed the system of air since I recently replaced the upper radiator hose. However, I have an expansion tank. I can use it like a funnel, correct?[/quote]

                        If your in need of help please start a new thread. 🙂

                        #582800
                        the metal bisonthe metal bison
                        Participant

                          Haven’t had much time to look at it lately, but I did notice that the condenser fan also does not run at all when I turn the a/c on (which i’m sure has no refrigerant in it) not sure if that matters. I just wanted to say that, as it might alter your idea on what to look at.

                          #582846
                          EricTheCarGuy 1EricTheCarGuy
                          Keymaster

                            I still recommend you look into the operation of the fan timer as I suggested earlier. The diagnosis is outlined in the video I posted for you.

                            #586335
                            the metal bisonthe metal bison
                            Participant

                              So I removed the radiator cap and ran the engine parked on an incline (my driveway) for what seemed like a long time. The coolant kept bubbling and bubbling. I guess this is the burp method. Anyway after about 15-20 minutes of this, the cooling fan came on!
                              I suppose enough air escaped to let everything do it’s job? I’m not sure how that works.
                              I took that as a success and shut the car off. I’ll know after I take it for a spin if it’s fixed. The coolant was still burping, however. I’m not sure if I should continue that until it stops.

                              Good call on the air in the system, Eric. Thanks.

                              #586340
                              Celica ManCelica Man
                              Participant

                                Perhaps you could just run a new switch to the fan…then you get to control when and how long it stays on.

                              Viewing 13 replies - 1 through 13 (of 13 total)
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