Rear heater line leak issue

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89Suburban

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Damn that sucks. Wonder what the hell the issue is.
 

mattbta

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Big SWAG that is usually the opposite of over-heating, but was the hose that connects to the overflow reservoir replaced? There's a reducer inside there that is vital to the operation of the cooling system - sometimes replacements don't have that. However, the symptoms of that are usually slow to reach operating temp and running way cool. Who knows at this point?
 

Fless

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Unless I missed that the radiator was changed, it would seem to be either that or the fan (electric or clutch-type) isn't working properly.
 

Fless

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Big SWAG that is usually the opposite of over-heating, but was the hose that connects to the overflow reservoir replaced? There's a reducer inside there that is vital to the operation of the cooling system - sometimes replacements don't have that. However, the symptoms of that are usually slow to reach operating temp and running way cool. Who knows at this point?

Believe the restrictor is in the radiator fitting for that hose.
 
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KarenZ71

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Going to look into ALL of this information thank you. I just tried to do a pressure test on it and air just comes straight out of the over flow hose as if the tank is not holding any pressure at all. Air just comes straight out. Could this be from the over flow tank or a bigger issue?
 
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KarenZ71

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Tried it again and I was using the wrong adaptor I guess. But found a slow leak on the Y (split hose to) to the water pump. So i guess that's next
....
It is a slow leak pressurized at 15lbs
 

89Suburban

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Are you sure the rotation of the water pump is correct? Or was that back on the GMT400's only?
 

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