Question about 1994 Toyota Corolla

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1994 Toyota Corolla... Overheating! HELP! Replaced: radiator, water pump, relay, temperature sensor & thermostat! Fans are working! Even ran it w/out thermostat in, NP. What am I missing?

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The one thing that no body has said is ANTIFREEZE LEVEL!!!!your cars with electric fans will not work right if there is only water in the system!!!!!!the fans turn on at 223 degrees.....boiling of water is 212......and that will make it over heat!!!!so make sure you got a 50/50 mixture.....

Posted on Apr 11, 2015

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You have not mentioned 2 important things. 1, have you checked for leaking head gasket'? It can blow in any of 3 ways. a) between cylinders, which will result in a misfire, sometimes slight. b) between compression chamber and water jacket, which will cause a gassy smell in the cooling system. Open the radiator cap and start the engine, check for water bubbles when the engine reaches operating temp, and smell the water. 3) between water jacket and oil channels - there will be water in the oil. Check the dipstick for emulsified oil in the sump (a greyish colour).
And then 2 - engine timing. If the timing is fast, the engine will tend to run hot, especially when under load as in uphills etc.You will also hear pinging (spontaneous combustion). If the timing is slow, it will also tend to run hot when under load under certain circumstances.
Let us know more.

Posted on Apr 06, 2015

  • Cass Buck
    Cass Buck Apr 11, 2015

    The compression test was good and the oil is normal!

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My 1987 corolla AE82 4 door sedan has an overheating problem. i changed the thermostat and radiator, not loosing any fluids, what could be the problem. Temperature sits at half way for normal and when i am...


Hi and welcome to FixYa,

Offhand, overheating as you described could be caused by:
  • too soft rubber upper/lower radiator hoses;
  • radiator fan clutch (is one is used) would need additional silica oil;
  • radiator fan relay switch;
  • radiator thermostatic switch for the fan.
A couple of ideas you may want to explore/consider:
  • wire the radiator fan directly to the IGN B+12;
  • remove the thermostat (not applicable in cold climate);
  • check water/coolant ratio (50/50);
  • some radiator fans will only work if and when the A/C or heater is engaged.
Good luck and Thank you for using FixYa.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

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