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  • 2.4 twin cam help

    I need some help with my grandmothers 1999 Grand Am with the 2.4 TWIN CAM (that is why it is in the off topic area).

    Riddle me this:

    If the engine starts to over heat (going by the temp gauge), and you pull the shifter from DRIVE to THIRD (increasing engine RPM) and the temp gauge starts going DOWN, What is wrong with the car?



    Now, a little background info.

    About 2 years ago, it started overheating, and instead of getting it into the shop like I told her too, she put it off for a few months. She took it into the shop FINALLY; they told her the waterpump had gone out, and she needed a new one.

    They did the pump, but they would not show me the new one before they put it in. I told them that if they did the cheap pump, we would be back in a year when it went out. About 11 months later, it started overheating again. This time, they said it was the HEADGASKET.

    I bought a new head, and gasket set, had them put it in, and it is STILL overheating. The shop is now telling her that she needs a new engine (after charging her $1800 to do the headgasket). I think the waterpump went out. They now have ALMOST convinced her that she needs to just get a new car (which she can't afford), and she needs to sell her car to them.

    Since it cools down when you put the car into THIRD (which increases RPM), I think that her waterpump has gone out AGAIN, but I want to get the opinions of people that might know more about the 2.4. If it was a 3400, I would have it fixed by now.

    FYI, don't start in with the "swap in a 3400", etc stuff. This is my GRANDMOTHERS CAR, and she is NOT interested in performance (but in the end, if it does need a new engine, it might end up with a 3400 anyways).
    Taylor
    1988 Olds Cutlass Supreme 3100 MPFI
    1990 Pontiac Grand Prix STE 3.1 MPFI
    1994 Olds Cutlass Supreme convertible
    1998 Lincoln Mark VIII
    "find something simple and complicate it"


  • #2
    Head gasket. Higher RPM = more compression leaking into the coolant passages which raise the water level in the block to cool the sensor off. It also pushes the coolant into the overflow. That is what happened to me before when I didn't tighten the head bolts down enough Now I know:P
    Ben
    60DegreeV6.com
    WOT-Tech.com

    Comment


    • #3
      Any bubbles popping up in the overflow or when u take the radiator cap off (or is it the enclosed type system?)
      I'll assume that the T-stat is replaced with a new one?

      When it over heats, are both radiator hoses (upper and lower) hot or just one?
      Lifting my front wheels, one jack at a time.

      Comment


      • #4
        yep, pop off the rad cap while it's running and watch for air bubbles.

        i just did a headgasket on a '98 GAGT 2.4 TC. I'll never do one again. The amount of work needed to simply remove the head is insane. It took us about 2 days from start to finish.. it's a 4 hour job on a 3400.
        Past Builds;
        1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
        1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
        Current Project;
        1972 Nova 12.73@105.7 MPH

        Comment


        • #5
          If it is the gasket then the coolant should stink like gas too. Have you ever had the rad checked? Hows the thermostat? Is the E-Fan working?
          1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
          1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
          Because... I am, CANADIAN

          Comment


          • #6
            fans work, radiator is sealed so I can't check it, smells fine.
            Taylor
            1988 Olds Cutlass Supreme 3100 MPFI
            1990 Pontiac Grand Prix STE 3.1 MPFI
            1994 Olds Cutlass Supreme convertible
            1998 Lincoln Mark VIII
            "find something simple and complicate it"

            Comment


            • #7
              Check the heater core/ core hoses. Quad 4's rely on the cooling system volume to cool the engine. I've seen more than once that a clogged heater core, or one that's been bypassed will cause the engine to run hot and/or overheat. One of the lines (can't remember if it's the inlet or outlet) has a restriction either in the hose or the fitting at the engine (depends on year/model). Could be the restriction is blocked, but not likely. D

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              • #8
                They had bypassed the heater core because it was bad. I put a new core in about 3 years ago. One of the lines going to the core had cracked, so I repalced the whole assembly (2 hoses connected in the middle with a plasic thingie).

                Flow seems to be good as far as the core goes.
                Taylor
                1988 Olds Cutlass Supreme 3100 MPFI
                1990 Pontiac Grand Prix STE 3.1 MPFI
                1994 Olds Cutlass Supreme convertible
                1998 Lincoln Mark VIII
                "find something simple and complicate it"

                Comment

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