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Ford Ranger Engine Overheat Issue

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  • #580696
    Joshua LeggJoshua Legg
    Participant

      Ford ranger 1994, 4.0 engine, 4×4. Engine heat gauge fluxuates from hot to normal. Put new water pump on, new thermostat, new radiator.no blown gaskets not losing any antifreeze. Don’t know what else to do

    Viewing 9 replies - 1 through 9 (of 9 total)
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    • #580700
      BillBill
      Participant

        I have seen a few 4.0lt of that vintage with cracked cylinder heads. you might want to test or have it tested for combustion gases in the cooling system.

        #580702
        Dave OlsonDave
        Participant

          The most common thing is that you have air trapped in the system, most likely is that the intake manifold is higher than the radiator. What you need to do is get the radiator up higher, so try driving up a hill to get the position you need then block the rear wheels and run the engine for a while to get the air out.

          #580716
          Joshua LeggJoshua Legg
          Participant

            Already checked the heads, any other ideas?

            #580720
            Joshua LeggJoshua Legg
            Participant

              Intake is lower than the radiator

              #580722
              BillBill
              Participant

                Okay……how did you check the heads?

                #580727
                Joshua LeggJoshua Legg
                Participant

                  Took the engine apart

                  #580728
                  Joshua LeggJoshua Legg
                  Participant

                    Took it apart checked the heads put a new gasket on checked the lifters, checked the plugs for dampness, no water or steam out the exhaust. I know what im doing I just can’t figure this one out

                    #580769
                    BillBill
                    Participant

                      I would like to think you know what you’re doing but did you have the heads magnafluxed at an engine machine shop? Even when I had perfect vision I couldn’t see cracks in cylinder heads unless they were checked and pointed out to me. Since cylinder firing pressure is higher than cooling system pressure you don’t always get a loss of coolant.

                      That said make sure the air is purged out as suggested.

                      #580792
                      Lorrin BarthLorrin Barth
                      Participant

                        Have you had any other sign the engine was hot other than the gauge?

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