Expansion tank cap?

Tiny
BEASTY83
  • MEMBER
  • 2000 FORD MUSTANG
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
I was wondering, do I need a cap on my expansion tank for the radiator?
Thursday, February 16th, 2023 AT 12:30 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
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
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Thursday, February 16th, 2023 AT 8:25 PM

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