Question about 1993 Toyota Land Cruiser

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1993 Toyota Land Cruiser Over Heating

I have a good radiator (been tested and cleaned, great flow), the head gasket has been replaced, the fan clutch has been replaced, the thermastat has been replaced, the water pump has been replaced and I am about to remove the therostat and le *** run with out one to see if that solves the over heating problem. The engine light just came on again. It came on before I had the head work done, and went away after the work. Now it is back on again, that part worries me. I am at a loss. It does okay at fast speeds, in town is bad. Any help or suggestions are greatly appreciated.

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  • mikefwb Sep 21, 2009

    It seems to be okay at high speeds, traffic and stop lights is where it overheats.

  • mikefwb Sep 21, 2009

    Engine light code: I do not know, I tried to purchase a tester but was told they only go back to 1996 vehicles, mine is a 1993.

  • Chemist1961 May 11, 2010

    Have you flushed the actual cooling system?

  • Superbovine May 11, 2010

    So it is overheating at low speed/stop and go traffic? What was the engine light code that was set, and the current code that is set?

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It would appear you have an airflow problem. Driving at highway speed the radiator is getting adequate cooling, but at low speed and stop lights you are not.

Run your vehicle up to operating temperature a then shut it off.
Open the hood and grab the fan blade and give it a spin. It should be very hard to turn (possible, but not free). If it spins relatively free, your viscous clutch needs replacement or fluid changed.
When this happens you have insufficient airflow across the radiator at low speeds. It is unnoticeable at high speed as you have driving airflow to cool the radiator.

To check your check engine light, Located the DLC1 connector pictured and short pins TE1 and E1 with the ignition on, parking brake set, vehicle in neutral.
Your check engine light will flash the codes at you. 2 flashes, long pause, one flash, long pause would be a code 21, for example.

To clear the code remove the EFI 15A fuse under the hood for 1 minute.

Posted on Sep 21, 2009

  • Superbovine Sep 21, 2009

    Sorry I forgot fromt he first time I read you had replaced the clutch already. Still check it just in case, as this is definitely an airflow issue, and if the radiator is flowing with no blockages and there are no external obstructions, there is very little else it could be.

    If the thermostat was only opening partially, that could be an issue, slight longshot, but there isn't anything else left to replace!

    If it a go, and find out what those check engine light codes are.

  • Superbovine Sep 21, 2009

    Gah, picture did not post again




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