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Thread: Corolla KE70 OVERHEATINGG !!!

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    Default Corolla KE70 OVERHEATINGG !!!

    My 1980 Toyota Corolla (KE70) has the standard 4K engine.
    Here is a link to the pic of the engine
    http://2.bp.blogspot.com/_G8Dg1XGzwd...0/100_1956.JPG

    NOTE: The radiator fan which comes in this model is not automatic but instead is connected via a belt which spins based on how fast the engine is running/revving.

    So the problem is that the car overheats with the A/C running. It heats up slowly when the car is moving and heats up quite quickly in traffic jams.
    Also with no AC and the engine running, the temperature needle comes up to almost half when the car is not moving. PLUS THE AC'S COMPRESSOR TURNS ON AND OFF ACCORDING TO THERMOSTAT so even this is no reason for the heat up.

    I got the following things done to control the overheating:
    --A bigger radiator.
    --A bigger radiator fan with 7 blades
    --An extra electric fan (This is in addition to the AC fan)
    --The car is tuned properly
    --The engine oil level is perfect and the oil is relatively new
    --Got double head gaskets installed.
    --Got the radiator completely serviced.

    BUT STILL! THE CAR OVERHEATS WITH THE AC ON, IN TRAFFIC JAMS OR WHEN MOVING SLOW..

    WHAT SHOULD I DO? HELP\

    The car runs on CNG usually by the way


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    Oh and the AC's radiator is placed exactly in front of the engine's radiator.

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    overheat meaning temp needle is on H
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    the pictures you show are of no help, and btw its not a good attempt at painting, the brake lines, strut mounts and steering yoke and assorted bits should have been removed and galvanised
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Yes the temperature needle goes to H

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    And thank you for the critique. I did get them coated later by the way

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    double gasket is bad (im presuming you had bad problems with your head and shaved it too much - bad, get a new one) - and throughly check your cylinder head for cracks - and water pump for correct functioning, if the impeller is corroded it will not move coolant. I would never suggest a solid 7 blade fan - too noisy and saps hp for no good reason. I would use the original small 4 blade fan OR I would swap it out for a viscous fan - pulls air like crazy when engaged and lets go when not needed.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Thanks alot! I dont think the water pump has issues but I'll get it checked anyway and will surely look for the viscous fan!

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    the viscous fan is the one you see in nearly every RWD toyota application now, the fan that can spin freely even with belts connected, the little round coil spring in the middle is the bimetal element which allows engagement/disengagement of the fan.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    I have a KE30, I have almost done the same but all to vein, as it works good on long drives but at standstill points i.e traffic jams and food spots, the car starts roaring heat and temperature needles gets to a point where I have switch off the ac any solid remedies for this problem any one can come up with
    * * * * *

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    do you have a dedicated ac condenser fan in the front?
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    no need to install double head gasket... Stupid mechanics do this... It never helps...

    Do this first

    Take an empty plastic pepsi bottle small and remove all covers from it...

    then pour water into it and then put the radiator pipe cover that is coming into the bottle into the bottle... Make sure the pepsi bottle is full in such a way that the pipe is immersed in water

    Now start the car and carefully monitor the water bottle
    see if bubbles start forming from the pipe in the bottle..> They should start forming initially and then dissapear once the pressure is released (within 2 to 3 minutes after the car is started)


    now note one thing: if the bubbles dont end up stopping then this is important. your temperature issue is due to the following factor:::

    CAR Head has defaced due to heating issue and being so old..

    Get the head faced and checked for any leaks

    Now if the car's head has alot of leaks, might i advice you to buy a new head then getting the current head faced....

    It shall resort out your issue... im sure and won't need double head gaskets..

    Also check your chamber compression...

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    double Gasket Is Total Waste.....!!! Just Make Sure Condenser Is Getting Cooled enough.......!!! If Problem Still Persist after All This...Most Likely Water Is Not flowing Easily Inside Block.......!!! There Is No Way A Healthy 4K with No Gasket Issue Heats Up On Big Radiator...(Big Radiator Means dual Barrel...)
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Quote Originally Posted by Xulfiqar View Post
    do you have a dedicated ac condenser fan in the front?
    Yes I have an automatic condenser fan in the front just like new cars have
    * * * * *

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    To Add I would like to tell you that I recently got my Engine Completely overhauled with new parts and I regularly change Engine Oil and check water
    * * * * *

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    u need electric motor fan and use coolant

    probably fan clutch gone bad

    i have kp61 with electric fan connected direct.
    ,,, unless you know the track, you're not good enough to sit behind the wheel." K T

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    Quote Originally Posted by SER_GTR View Post
    double Gasket Is Total Waste.....!!! Just Make Sure Condenser Is Getting Cooled enough.......!!! If Problem Still Persist after All This...Most Likely Water Is Not flowing Easily Inside Block.......!!! There Is No Way A Healthy 4K with No Gasket Issue Heats Up On Big Radiator...(Big Radiator Means dual Barrel...)
    SER_GTR is right, Get the water body checked and the thermostat replaced if it is too old... Most probably the water isn't flowing properly through the engine if you got the engine overhauled and stuff...

    But might i tell you this that i am sure you preferred a desi sasta mechanic for your Engine overhaul.. No offense brother...

    The reason why im saying this is no educated Mechanic would go for double gaskets...

    If you live in Lahore, visit Fazal motors. The guy is my uncle... And its not that i promote him here... I say that because he is an educated person and he really knows what the issue is rather than doing garbage work which sastay mechanics do and ruin cars...

    I got my alto overhauled once by mistake from a cheap mechanic, i thought it saved me 15000... But the end result was, engine degraded within just 2 MONTHS!!!

    and when i visited Fazal Motors, He told me the bores were'nt properly designed and even the pressure applied on the bolts of the head was far more than the standard requirement. He even told me that alot of places where slip should not be present in bolts, the mechanic had spoiled it all...
    I then got it re-overhauled for more money, but then the car never gave me issue and i used it for more than a year without any fault..

    Anyways sorry for deviating from the post, ..

    Check with the water bottle as i instructed you, if that is fine, get the double gasket removed to a single one, then check
    1. Water body
    2. Thermostat controlling the temp.
    3. Also get the Heat sensor checked, sometimes it gets too old and spoiled and doesnt give correct input for the fan to start automatically..

    if these don't work, then im sure you're engine didn't get proper overhauling

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    all of the 4K engines in Pakistan are running with no thermostats because the mechanics dont like it, secondly about 60% of them are running with badly aligned timing chain marks - in the older 4K with the twin link chain it is required to use a ruler or straight edge to align the timing marks and then installing the chain and tensioner.

    Bad compression timing would result in overheating no matter what.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Thank you all for your responses! @kazmi_muzammil.. I'll try the water bottle experiment tonight..

    Update

    I got an electric radiator fan installed and that almost solved the issue. The car doesnt heat up much now. Even in the blazing sun with high temperatures around and the AC blasting. The needle goes up to about 40%. I might get a new radiator with wider and more water pipes to further help keep the engine cool.

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