OER GM Radiator Overflow Reservoir Cap #340194 Nipple Failures

1974TypeLT

Veteran Member
Mar 19, 1999
740
NW, FL USA
This is the 3rd time in as many yrs, that I have had 1 of the 3 the nipples break on OER #340194 radiator overflow reservoir. Are they made that cheaply? Has anyone else experienced this problem and I wonder if I would be better off spending the extra money for a NOS OEM cap?
 

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Ricks72Z28

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Lifetime Gold Member
Jan 1, 2005
1,624
FYI…a NOS cap will have the larger port on the left side…
 

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1974TypeLT

Veteran Member
Mar 19, 1999
740
NW, FL USA
By L side, do you mean the side closest to the outside, which's more proximal to the inner fender wells, which is also fed by the radiator? If that is the L side, then I hope the larger lumen hose will still snuggly fit the radiator egress port. Thanks.
 

Ricks72Z28

Veteran Member
Lifetime Gold Member
Jan 1, 2005
1,624
yes that is correct….did you see my picture I attached for your reference?
 

1974TypeLT

Veteran Member
Mar 19, 1999
740
NW, FL USA
Are both of these GM OEM radiator overflow reservoir caps? I remember my original one had a clear appearance, like the one at the bottom.
 

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  • Rad Overflow Reservoir Caps OER vs NOS Top Angle.jpg
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  • Rad Overflow Reservoir Caps OER vs NOS Bottom Angle.jpg
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1974TypeLT

Veteran Member
Mar 19, 1999
740
NW, FL USA
I bought both on Ebay recently and both sellers claimed NOS, but the more opaque white cap at the top of the frame is reminiscent of the aftermarket OER model, where the more translucent cap at the bottom of the frame favours yours and my old original cap. I have had poor luck with the OER caps and I am tempted to return the opaque white one back to the seller. Thanks.
 

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