C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Coolant Leak--Need Some Help

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Old Mar 7, 2017 | 04:57 PM
  #21  
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Originally Posted by 4xcontractor
I've have a leak in almost the same area, bought a pressure tester from HF to locate it, Ck with a mirror if you can at the lower water pump bolt on that side right above the timing bracket. Mine is weeping out between the pump and block, not easy to see, ends up running along the cross member before hitting the ground.
Looks like you are exactly right.
I got the pressure tester, and after pumping it, the coolant was oozing out from the WP gasket and trickling down. It is easier to detect with the pressure pushing it out.
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Old Mar 7, 2017 | 06:29 PM
  #22  
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Be happy it was not the heater bypass, i just shelled out $120 for a new one...

​​​​​​​The insides had fractured into little pieces and it was leaking all over the place.
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Old Mar 7, 2017 | 07:20 PM
  #23  
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Default water pump gasket leak

Originally Posted by VikingTrad3r
don't forget to get prepared and the exact rate torqx bit size for the hidden screw under the AC
Good suggestion for the torx bit that is hidden. I replaced the water pump many years ago because of leak from the weap hole. Several years later had a leak very similar to yours and discovered it was from the driers side of the water pump. I did not want to do all the dismantling of parts and tried tightening up the bottom water pump bolt with just a bit more than the recommended torque. It worked. This was several years ago now and the leak has not came back on my 1985. If it does I will have to replace the water pump gaskets.
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