Expansion tank cap?

2000 FORD MUSTANG
210,000 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
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BEASTY83
  • MEMBER
  • 39 POSTS
I was wondering, do I need a cap on my expansion tank for the radiator?
Feb 16, 2023 at 12:30 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

Because the radiator cap is the pressure release cap, in theory, the reservoir is only used as a holding tank. So, in theory, it isn't needed other than to prevent coolant from splashing out. However, I would recommend having one.

Let me know if you have other questions.

Take care,

Joe
Feb 16, 2023 at 8:25 PM
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