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  • Cooling System Question
  • Cooling System Question
  • Cooling System Question
  • Cooling System Question

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  1. #1
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    Default Cooling System Question

    I had an anti-freeze leak on my 1980 Vette. Heat core leaking. (That was fun to replace). I have now replaced the radiator and pressure cap, water pump, thermostat, all belts and hoses and hose clamps, heater flow control valve and new anti-freeze. When running, the temperature stays at about 200 to 205. I used a temperature gun to confirm the engine temp. Gauge is accurate within reason.

    After running the car then shutting down, the car burbs about a pint of coolant out of the coolant system. Shows up on the ground near the heater core hoses. I used a pressure tester and cannot produce the leak with the car sitting in the shop. I tested the pressure cap and it holds 16 pounds of pressure. With all of that said, here is the question, would it be normal for the radiator to run low about a pint. It seems that if I leave the coolant level low, it does not loose any additional coolant, but leaving the coolant system low on coolant does not seem like the right answer. Thoughts anyone?

  2. #2
    Member dougelam's Avatar
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    When you say "by the heater hoses" did that mean at the firewall?

    A closed cooling will equalize it self after 1 cycle
    Too much and it fills the reservoir when hot and at cap regulated pressure
    Not enough it will draw it from the reservoir as it cools


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  3. #3
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    Quote Originally Posted by dougelam View Post
    When you say "by the heater hoses" did that mean at the firewall?

    A closed cooling will equalize it self after 1 cycle
    Too much and it fills the reservoir when hot and at cap regulated pressure
    Not enough it will draw it from the reservoir as it cools


    Sent from my SM-N920P using Tapatalk

    The anti-freeze is dripping on the ground near where the heater hoses exit the bottom of the car. Could be running down the frame rail. Hard to tell.

  4. #4
    Member LLC5's Avatar
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    Quote Originally Posted by Drwhitesr View Post
    The anti-freeze is dripping on the ground near where the heater hoses exit the bottom of the car. Could be running down the frame rail. Hard to tell.


    You need to find that coolant leak, it shouldn't be hard to find with that much coolant on the ground. Always trace to the highest point of any leak.

    Do you have a surge or overflow tank on the vehicle for the radiator?
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  5. #5
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    Theres the surge/overflow tank with the cold level.its a little overfilled. if it aint leaken there its proably a loose hose clamp. Pressure testing the system while its cold sometimes wont work since the thermostat is closed & the heater control valve needs vacuum to open.Not my vette but its similiar to c3's,my old 68 didn't have a overflow tank,I did add 1.
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  6. #6
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    Quote Originally Posted by Wayback View Post
    Theres the surge/overflow tank with the cold level.its a little overfilled. if it aint leaken there its proably a loose hose clamp. Pressure testing the system while its cold sometimes wont work since the thermostat is closed & the heater control valve needs vacuum to open.Not my vette but its similiar to c3's,my old 68 didn't have a overflow tank,I did add 1.
    I have the same tank in my car as the one in your picture

  7. #7
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    Quote Originally Posted by Drwhitesr View Post
    I have the same tank in my car as the one in your picture
    Thanks for your thoughts. You would think it would be easy to find the source of the leak, but yet it is driving me nuts.

  8. #8
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    Quote Originally Posted by Drwhitesr View Post
    Thanks for your thoughts. You would think it would be easy to find the source of the leak, but yet it is driving me nuts.

    If you have a/c like the vehicle in the pictures see if the coolant coming out of the evaporator drain tube.
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  9. #9
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    Quote Originally Posted by LLC5 View Post
    If you have a/c like the vehicle in the pictures see if the coolant coming out of the evaporator drain tube.
    That would mean that the new heater core is leaking correct? I hope that is not the case. Putting the new heater core in was not fun.

  10. #10
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    Quote Originally Posted by Drwhitesr View Post
    That would mean that the new heater core is leaking correct? I hope that is not the case. Putting the new heater core in was not fun.

    Yes, if coolant is coming out of the evap drain tube then there is a problem in that area. The drain tube should be above the drip area you were describing. If you find coolant there make sure you follow up the firewall and engine area to make sure that the leak isn't external.
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