The Volvo Parts, Accessories &
Performance Specialists Since 1963

Green, Gray or Black? Expansion Tank Cap

2019-01-09 - ipd Staff

Disclaimer: Direct from ipd’s Tech Tip archive!  This tech tip contains information from previous publications.  Products mentioned may not be available or the information may not be accurate due to changes in supply, manufacturing, or part number association.  Please contact ipd Customer Support if you have further questions  info@ipdusa.com

The overflow cap takes the place of a conventional radiator cap and provides an overpressure relief system to protect the radiator and hoses. Gas powered 200 series use the Black cap rated at 1 1psi / 75 KPA. All gas powered 700/900 were originally equipped with a Gray cap, but Volvo has superseded the Gray cap to a more reliable Green cap rated at 22 psi/152 KPA.

NOTE: When using our high efficiency 3 row radiator, the Black cap is required to prevent damage to the radiator.