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OER GM Radiator Overflow Jar Caps

3.96 out of 5 stars 28 Customer Reviews

Replace that broken, warped, or missing cap on your ride to keep your overflow bottle from leaking coolant with a new one from OER. These radiator overflow jar caps are designed to fit on various GM applications and feature "Engine Coolant Only" stamped right onto them. When you need quality replacements that are as good as the originals or better, equip your ride with the best--OER!

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OER GM Radiator Overflow Jar Caps 371978

OER GM Radiator Overflow Jar Caps 371978

OER GM Radiator Overflow Jar Caps 371978

Overflow Tank Components, Overflow Tank Cap, Reproduction, Non-Vented, Black Plastic, White Letters, Chevrolet, GMC, Pontiac, Each

Part Number: OER-371978

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 8/25/2025

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Estimated Ship Date: Monday 8/25/2025

OER GM Radiator Overflow Jar Caps 15630112

OER GM Radiator Overflow Jar Caps 15630112

OER GM Radiator Overflow Jar Caps 15630112

Vented Radiator Overflow Jar Cap, Engine Coolant Only Logo, For Buick, Chevy, Oldsmobile, Pontiac, Each

Part Number: OER-15630112

3.0 out of 5 stars ( 6 )

Estimated Ship Date: Monday 8/25/2025

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Estimated Ship Date: Monday 8/25/2025

OER GM Radiator Overflow Jar Caps 340194

OER GM Radiator Overflow Jar Caps 340194

OER GM Radiator Overflow Jar Caps 340194

Radiator Overflow Jar Cap, Engine Coolant Only Logo, Buick, Cadillac, Chevy, GMC, Oldsmobile, Pontiac, Each

Part Number: OER-340194

4.0 out of 5 stars ( 15 )

Estimated Ship Date: Monday 8/25/2025

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Estimated Ship Date: Monday 8/25/2025

OER GM Radiator Overflow Jar Caps 15588032

OER GM Radiator Overflow Jar Caps 15588032

OER GM Radiator Overflow Jar Caps 15588032

Overflow Tank Components, Bottle Cap, Reproduction, Black Plastic, White Lettering, Chevrolet, GMC, Each

Part Number: OER-15588032

Not Yet Reviewed

Estimated Ship Date: Monday 8/25/2025

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Estimated Ship Date: Monday 8/25/2025

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