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Thread: Coolant system question?

  1. #1

    Default Coolant system question?

    Okay so i pinpointed my radiator to be causing the loss of water, and so i replaced it, it HELPED, then i got a new thermostat and rad cap, i topped the coolant off, drove it around no coolant gushing noise, on the way back home, LOTS of coolant gushing noise. Did the same next day topped off then gushing noise after about 20 mins driving. The coolant overflow bottle seems to be playing around the min and max levels and returns to normal the next morning, but i still have to add coolant maybe about 1/4 cup? My question is, where else could it be leaking, coolant did not have any combustion gases, nor was the heater core leaking, it just loses water after driving a long time, engine oil is the normal color and the exhaust doesnt have white smoke unless i first start it then it goes away, where could it be coming from? there are no visible leaks nor any noises of any coolant spraying. anyone could possibly help me? let me know, thanks!

    edit: after replacing my radiator i did notice the temp gauge never went up past its normal temp, it would use to occasionally go up then back down, now it doesnt...
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  2. #2
    TWINKY
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    Default Re: Coolant system question?

    Are you running water or coolant? Coolant has a greater boiling temp than water. What could be happening is the water in your radiator is boiling and creating pressure, too much for the radiator cap to handle, and releasing it into the overflow tank until the high pressure from boiling over is released. OR. You could have a faulty t-stat. If your t-stat isn't opening like it should you will build too much pressure and it will be released into the overflow tank. And then it will open. A while back I had a similar problem. My car kept spilling coolant out the overflow tank and it would overheat. Everyone was saying I had a BHG. Well jdub stepped in and helped me out. He told me to cut the jiggle valve off, as it being removed it would relieve the pressure and open the t-stat. It worked I haven't had a cooling problem since. So I would try that. And see what happens. If you are running straight water replace it with coolant.


    BTW thank you very much jdub
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  3. #3
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    Default Re: Coolant system question?

    A little off track, but are you using the stock temp gauge? If so, I want to let you know that it's desgned to not move for a big range (see this post).


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  4. #4

    Default Re: Coolant system question?

    As for NTRA08's post, I am running coolant in the system, but i believe since the leak was repaired i have been using more water in the mixture than coolant (3 h20 to 1 coolant) could that be causing the issue? I have a new OEM thermostat already and cut the jiggle valve off. It just seems to be losing a bit of water every day without any visible leaks, the water from the overflow reservoir returns back to the radiator as the tank level gets lower than when it was running i checked the next morning, its just when i open the radiator id have to keep adding a little more water everyday and its just difficult to find the leak when i cant smell coolant, cant see any leaks, and hear any hissing.

    A. Jay: Yes i am using the stock temperature gauge, and if there is an alternative, what could i use? thanks
    Always a work in progress...

    '84 Toyota Celica Supra 121k miles - SOLD
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  5. #5
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    Default Re: Coolant system question?

    i hope this isnt the problem for you... but check behind the engine for leaks that metal heater hose that wraps around the engine corrodes,leaks, and you can usually not see it but hear it...

  6. #6
    TWINKY
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    Default Re: Coolant system question?

    SRZMK3 your right. Also the 90 degree 5/8 hose on the pass side that connects to the front main from the pipe on the side of the block. I had mine leaking there and never saw it until I got shot in the face when is burst. Also there are two hoses on your TB and two on your IAC and one on the bottom of your intake. Check those too. Running that much water to coolant might be your problem. Or it might not. At least you got your t-stat out of the way. Did you replace your rad cap?

    ---------- Post added at 02:30 PM ---------- Previous post was at 02:28 PM ----------

    You could also drain your system a little and put a dye in your radiator. Fire up the car at night and check for leaks with a UV black light
    I'm not insane. You just don't understand
    1987 Supra GTE GONE
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  7. #7

    Default Re: Coolant system question?

    alright i will check the 90 degree hose on the back of the engine bay as well as the metal hose that wraps around the engine block its just weird how i dont see smell or hear anything and i dont see moisture in the car so no way its the heater core. Ive ran full water on other cars before they never had a coolant gurgling noise and yes radiator cap was replaced the same time i did the thermostat and radiator i just dont know where else it could be leaking..
    Always a work in progress...

    '84 Toyota Celica Supra 121k miles - SOLD
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    '89 Supra n/a - SOLD!
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    '90 Supra turbo targa - Project Car
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  8. #8
    TWINKY
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    Default Re: Coolant system question?

    If all else fails use the dye and a uv black light
    I'm not insane. You just don't understand
    1987 Supra GTE GONE
    1990 Supra GTE

  9. #9

    Default Re: Coolant system question?

    updates, no visible leak has been found but i did notice the water level always dropped after an hour or so, im hoping its not the heater core, not head gasket as the exhaust does not smell like coolant, nor did the cooling system have exhaust gases, i did notice the hose under the dizzy was suppose to be a 90 degree bend that was kinked to sh*t like it was a straight hose forced on there, ill be replacing that tomorrow, re-torquing my head gasket, and if all else fails, then idk what else to do...
    Always a work in progress...

    '84 Toyota Celica Supra 121k miles - SOLD
    '93 Toyota Corolla DX - SOLD!
    '89 Supra n/a - SOLD!
    '91 Toyota MR2 n/a - SOLD!
    '92 White Toyota Celica - SOLD
    '90 Supra turbo targa - Project Car
    '92 Teal Toyota Celica - Daily Driver

  10. #10

    Default Re: Coolant system question?

    replaced all heater hoses with new ones, 90 degree bend hoses are new as well, rad hoses are new and clamps are new as well, head gasket is torqued to 85ft lbs, heater valve bypassed, rad is new, cap and thermostat is new, no apparent leaks anywhere, no fogging up windshield inside, where could the water possibly be going still??
    Always a work in progress...

    '84 Toyota Celica Supra 121k miles - SOLD
    '93 Toyota Corolla DX - SOLD!
    '89 Supra n/a - SOLD!
    '91 Toyota MR2 n/a - SOLD!
    '92 White Toyota Celica - SOLD
    '90 Supra turbo targa - Project Car
    '92 Teal Toyota Celica - Daily Driver

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